backgrounds-borders — 100.00% verified visual parity

← all categories · PASS 82 · FAIL 0 · REFERENCE-DISPUTED 1 · 83 total · 300 DPI

diff colours:MissingExtraColorErrMatchFull-page diff: matching and per-channel ≤1.0% pixels are blank; coloured classes are same-coordinate above-floor evidence. Exact RGBA mismatch remains numeric.

show PASS 82status class min diff% sort

background-clip — 100.00% verified visual parity PASS 4 · FAIL 0 · REFERENCE-DISPUTED 1all categories ↑

REFERENCE-DISPUTED 4554 px · above-floor 1.57% · raw 1.58% max-page diff background-clip-text-gradient · text · REFERENCE DISPUTEDAntialiasCoveragemissing 2.8%extra 3.8%ΔE 20.9

why: above-floor complete-page mismatch 1.565714% exceeds 1.0% PASS ceiling; visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

background-clip:text clips a gradient background to glyph shapes; catches engines that map text to border-box or leave transparent text invisible.

reference dispute: CSS Backgrounds 4 defines background-clip:text by the text geometry, not a text-edge sampling grid or PDF representation. Chromium's PDF turns the matched ParitySans outlines into a 196x83 soft-mask image; Ironpress retains the same outline geometry as a vector text clip. The gradient interior and glyph positions agree, but the two valid edge-coverage strategies cannot be a unique pixel oracle.

regions (611 total; showing 64 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	271	2644	0,0 → 182,53	438	total 2.8% · largest 0.5%
Missing	162	810	0,0 → 182,52	144	total 0.9% · largest 0.2%
Extra	178	1100	0,1 → 182,53	227	total 1.2% · largest 0.2%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	52,0 → 84,52	0.5	ΔRGB(-7,-16,-12)	antialiasing coverage residue on a shared outline
AntialiasCoverage	138,0 → 182,52	0.4	ΔRGB(-21,-21,-6)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,0 → 44,52	0.4	ΔRGB(-10,-28,-23)	antialiasing coverage residue on a shared outline
AntialiasCoverage	59,22 → 85,52	0.3	ΔRGB(-8,-15,-11)	antialiasing coverage residue on a shared outline
Extra	156,6 → 182,53	0.2		candidate adds paint absent from reference (0.2%)
Extra	19,6 → 44,53	0.2		candidate adds paint absent from reference (0.2%)
AntialiasCoverage	138,1 → 156,52	0.2	ΔRGB(54,57,20)	antialiasing coverage residue on a shared outline
Missing	19,7 → 19,52	0.2		candidate lacks paint present in reference (0.2%)
Missing	0,0 → 44,0	0.1		candidate lacks paint present in reference (0.1%)
Extra	52,53 → 85,53	0.1		candidate adds paint absent from reference (0.1%)
Missing	59,47 → 85,47	0.09		candidate lacks paint present in reference (0.09%)
Extra	59,6 → 84,6	0.09		candidate adds paint absent from reference (0.09%)
Missing	59,0 → 84,0	0.08		candidate lacks paint present in reference (0.08%)
Missing	157,0 → 182,0	0.08		candidate lacks paint present in reference (0.08%)
Missing	59,22 → 84,22	0.08		candidate lacks paint present in reference (0.08%)
Extra	59,28 → 84,28	0.08		candidate adds paint absent from reference (0.08%)
AntialiasCoverage	0,1 → 19,6	0.08	ΔRGB(-24,-80,-69)	antialiasing coverage residue on a shared outline
Extra	0,6 → 18,6	0.06		candidate adds paint absent from reference (0.06%)
Extra	138,6 → 156,6	0.06		candidate adds paint absent from reference (0.06%)
AntialiasCoverage	128,0 → 136,3	0.06	ΔRGB(5,6,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	94,0 → 102,1	0.03	ΔRGB(115,177,104)	antialiasing coverage residue on a shared outline
Extra	92,53 → 100,53	0.03		candidate adds paint absent from reference (0.03%)
Extra	129,53 → 137,53	0.03		candidate adds paint absent from reference (0.03%)
Missing	95,0 → 102,0	0.02		candidate lacks paint present in reference (0.02%)
AntialiasCoverage	121,40 → 122,42	0.009512	ΔRGB(-48,-62,-31)	antialiasing coverage residue on a shared outline
AntialiasCoverage	114,30 → 115,31	0.007398	ΔRGB(-39,-54,-28)	antialiasing coverage residue on a shared outline
AntialiasCoverage	115,19 → 115,20	0.006341	ΔRGB(51,70,37)	antialiasing coverage residue on a shared outline
Missing	128,0 → 130,0	0.005284		candidate lacks paint present in reference (0.005284%)
AntialiasCoverage	122,9 → 123,9	0.005284	ΔRGB(51,67,33)	antialiasing coverage residue on a shared outline
AntialiasCoverage	121,10 → 122,10	0.005284	ΔRGB(51,68,34)	antialiasing coverage residue on a shared outline
AntialiasCoverage	121,11 → 121,11	0.005284	ΔRGB(51,68,34)	antialiasing coverage residue on a shared outline
AntialiasCoverage	120,12 → 121,12	0.005284	ΔRGB(51,68,34)	antialiasing coverage residue on a shared outline
AntialiasCoverage	119,12 → 120,13	0.005284	ΔRGB(51,68,34)	antialiasing coverage residue on a shared outline
AntialiasCoverage	104,15 → 105,16	0.005284	ΔRGB(-35,-52,-30)	antialiasing coverage residue on a shared outline
AntialiasCoverage	105,16 → 105,17	0.005284	ΔRGB(-36,-53,-30)	antialiasing coverage residue on a shared outline
AntialiasCoverage	106,17 → 106,18	0.005284	ΔRGB(-37,-54,-30)	antialiasing coverage residue on a shared outline
AntialiasCoverage	106,18 → 107,19	0.005284	ΔRGB(-37,-54,-31)	antialiasing coverage residue on a shared outline
AntialiasCoverage	107,19 → 107,20	0.005284	ΔRGB(-38,-56,-31)	antialiasing coverage residue on a shared outline
AntialiasCoverage	108,20 → 108,20	0.005284	ΔRGB(-39,-57,-32)	antialiasing coverage residue on a shared outline
AntialiasCoverage	108,21 → 108,21	0.005284	ΔRGB(-39,-57,-31)	antialiasing coverage residue on a shared outline
AntialiasCoverage	109,22 → 109,22	0.005284	ΔRGB(-40,-57,-31)	antialiasing coverage residue on a shared outline
AntialiasCoverage	109,23 → 110,23	0.005284	ΔRGB(-41,-59,-32)	antialiasing coverage residue on a shared outline
AntialiasCoverage	110,24 → 110,24	0.005284	ΔRGB(-42,-60,-32)	antialiasing coverage residue on a shared outline
AntialiasCoverage	119,25 → 119,26	0.005284	ΔRGB(-10,-14,-7)	antialiasing coverage residue on a shared outline
AntialiasCoverage	110,25 → 110,26	0.005284	ΔRGB(48,69,38)	antialiasing coverage residue on a shared outline
AntialiasCoverage	109,26 → 110,27	0.005284	ΔRGB(48,69,38)	antialiasing coverage residue on a shared outline
AntialiasCoverage	108,27 → 109,28	0.005284	ΔRGB(48,69,38)	antialiasing coverage residue on a shared outline
AntialiasCoverage	108,28 → 108,29	0.005284	ΔRGB(48,69,38)	antialiasing coverage residue on a shared outline
AntialiasCoverage	107,29 → 108,30	0.005284	ΔRGB(48,69,39)	antialiasing coverage residue on a shared outline
AntialiasCoverage	107,30 → 107,31	0.005284	ΔRGB(48,69,39)	antialiasing coverage residue on a shared outline
AntialiasCoverage	106,31 → 107,32	0.005284	ΔRGB(48,69,39)	antialiasing coverage residue on a shared outline
AntialiasCoverage	115,31 → 116,32	0.005284	ΔRGB(-40,-55,-29)	antialiasing coverage residue on a shared outline
AntialiasCoverage	116,32 → 116,33	0.005284	ΔRGB(-38,-53,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	123,44 → 124,44	0.005284	ΔRGB(-56,-73,-36)	antialiasing coverage residue on a shared outline
AntialiasCoverage	124,44 → 124,45	0.005284	ΔRGB(-55,-72,-35)	antialiasing coverage residue on a shared outline
AntialiasCoverage	124,45 → 125,46	0.005284	ΔRGB(-55,-70,-35)	antialiasing coverage residue on a shared outline
AntialiasCoverage	125,46 → 125,47	0.005284	ΔRGB(-54,-69,-33)	antialiasing coverage residue on a shared outline
AntialiasCoverage	126,47 → 126,48	0.005284	ΔRGB(-52,-67,-32)	antialiasing coverage residue on a shared outline
AntialiasCoverage	126,48 → 127,49	0.005284	ΔRGB(-50,-64,-31)	antialiasing coverage residue on a shared outline
AntialiasCoverage	127,49 → 127,50	0.005284	ΔRGB(-48,-61,-29)	antialiasing coverage residue on a shared outline
AntialiasCoverage	128,50 → 128,51	0.005284	ΔRGB(-45,-57,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	128,51 → 129,52	0.005284	ΔRGB(-44,-55,-26)	antialiasing coverage residue on a shared outline
AntialiasCoverage	95,2 → 96,2	0.004227	ΔRGB(-27,-43,-26)	antialiasing coverage residue on a shared outline
AntialiasCoverage	96,3 → 96,3	0.004227	ΔRGB(-28,-44,-26)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/background-clip-text-gradient.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>background-clip text gradient</title>
6<style>
7  @page { size: 264px 112px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .word {
12    width: 260px;
13    height: 110px;
14    font-size: 72px;
15    line-height: 110px;
16    text-align: center;
17    color: transparent;
18    background-image: linear-gradient(to right, #d50000, #2962ff);
19    background-clip: text;
20    -webkit-background-clip: text;
21    -webkit-text-fill-color: transparent;
22  }
23</style>
24</head>
25<body>
26  <div class="word">TEXT</div>
27</body>
28</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.37% · raw 0.54% (1795 px) background-clip-padding-box-elliptical-radius · padding-box-elliptical-radiusPASS via CSS-scale observation: stable same-coordinate outline phaseAntialiasCoveragemissing 0.03%extra 0.3%ΔE 9.7

why: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

background-clip:padding-box follows the elliptical inner border curve beneath a translucent solid border; catches red background bleed into the border band.

regions (652 total; showing 64 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	458	1364	0,0 → 170,95	128	total 0.9% · largest 0.08%
Extra	150	387	0,0 → 168,86	23	total 0.2% · largest 0.01%
Missing	44	44	98,68 → 170,95	1	total 0.03% · largest 0.000633%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	170,27 → 170,68	0.08	ΔRGB(78,78,78)	antialiasing coverage residue on a shared outline
AntialiasCoverage	154,28 → 154,67	0.08	ΔRGB(7,48,48)	antialiasing coverage residue on a shared outline
Extra	73,0 → 80,0	0.01		candidate adds paint absent from reference (0.01%)
Extra	90,0 → 97,0	0.01		candidate adds paint absent from reference (0.01%)
AntialiasCoverage	72,95 → 78,95	0.01	ΔRGB(78,78,78)	antialiasing coverage residue on a shared outline
AntialiasCoverage	91,95 → 97,95	0.01	ΔRGB(78,78,78)	antialiasing coverage residue on a shared outline
AntialiasCoverage	3,74 → 6,77	0.01	ΔRGB(11,11,11)	antialiasing coverage residue on a shared outline
AntialiasCoverage	71,16 → 75,16	0.009493	ΔRGB(0,1,-1)	antialiasing coverage residue on a shared outline
ColorValue	95,16 → 99,16	0.009493	ΔRGB(0,1,-1)	fill recolour ΔRGB(+0,+1,-1) (ΔE 0)
ColorValue	70,79 → 74,79	0.008228	ΔRGB(0,1,-1)	fill recolour ΔRGB(+0,+1,-1) (ΔE 0)
ColorValue	96,79 → 100,79	0.008228	ΔRGB(0,1,0)	fill recolour ΔRGB(+0,+1,+0) (ΔE 0)
AntialiasCoverage	67,94 → 71,94	0.008228	ΔRGB(78,78,78)	antialiasing coverage residue on a shared outline
Extra	68,0 → 71,0	0.007595		candidate adds paint absent from reference (0.007595%)
Extra	99,0 → 102,0	0.007595		candidate adds paint absent from reference (0.007595%)
AntialiasCoverage	76,16 → 79,16	0.007595	ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	91,16 → 94,16	0.007595	ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	99,94 → 102,94	0.006962	ΔRGB(78,78,78)	antialiasing coverage residue on a shared outline
AntialiasCoverage	74,79 → 77,79	0.006329	ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	93,79 → 96,79	0.006329	ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	63,94 → 66,94	0.006329	ΔRGB(78,78,78)	antialiasing coverage residue on a shared outline
Extra	64,1 → 66,1	0.005696		candidate adds paint absent from reference (0.005696%)
ColorValue	64,16 → 67,16	0.005696	ΔRGB(0,1,0)	fill recolour ΔRGB(+0,+1,+0) (ΔE 0)
AntialiasCoverage	104,78 → 107,78	0.005696	ΔRGB(0,1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	104,94 → 107,94	0.005696	ΔRGB(78,78,78)	antialiasing coverage residue on a shared outline
Extra	104,1 → 106,1	0.005063		candidate adds paint absent from reference (0.005063%)
ColorValue	103,16 → 106,16	0.005063	ΔRGB(0,1,0)	fill recolour ΔRGB(+0,+1,+0) (ΔE 0)
ColorValue	63,78 → 66,78	0.005063	ΔRGB(0,1,0)	fill recolour ΔRGB(+0,+1,+0) (ΔE 0)
AntialiasCoverage	60,94 → 62,94	0.005063	ΔRGB(78,78,78)	antialiasing coverage residue on a shared outline
Extra	60,1 → 62,1	0.004430		candidate adds paint absent from reference (0.004430%)
Extra	108,1 → 109,1	0.004430		candidate adds paint absent from reference (0.004430%)
Extra	57,1 → 59,1	0.004430		candidate adds paint absent from reference (0.004430%)
ColorValue	109,17 → 111,17	0.004430	ΔRGB(0,1,0)	fill recolour ΔRGB(+0,+1,+0) (ΔE 0)
AntialiasCoverage	163,17 → 164,18	0.004430	ΔRGB(11,11,11)	antialiasing coverage residue on a shared outline
AntialiasCoverage	54,93 → 56,93	0.004430	ΔRGB(69,69,69)	antialiasing coverage residue on a shared outline
AntialiasCoverage	57,93 → 59,93	0.004430	ΔRGB(78,78,78)	antialiasing coverage residue on a shared outline
AntialiasCoverage	108,94 → 110,94	0.004430	ΔRGB(78,78,78)	antialiasing coverage residue on a shared outline
Extra	111,1 → 112,1	0.003797		candidate adds paint absent from reference (0.003797%)
Extra	55,2 → 56,2	0.003797		candidate adds paint absent from reference (0.003797%)
ColorValue	59,17 → 61,17	0.003797	ΔRGB(0,1,0)	fill recolour ΔRGB(+0,+1,+0) (ΔE 0)
ColorValue	55,17 → 57,17	0.003797	ΔRGB(0,1,0)	fill recolour ΔRGB(+0,+1,+0) (ΔE 0)
ColorValue	114,78 → 115,78	0.003797	ΔRGB(0,1,0)	fill recolour ΔRGB(+0,+1,+0) (ΔE 0)
AntialiasCoverage	59,78 → 60,78	0.003797	ΔRGB(0,1,0)	antialiasing coverage residue on a shared outline
ColorValue	109,78 → 111,78	0.003797	ΔRGB(0,1,0)	fill recolour ΔRGB(+0,+1,+0) (ΔE 0)
AntialiasCoverage	17,84 → 19,84	0.003797	ΔRGB(32,32,32)	antialiasing coverage residue on a shared outline
AntialiasCoverage	50,92 → 51,92	0.003797	ΔRGB(78,78,78)	antialiasing coverage residue on a shared outline
AntialiasCoverage	118,92 → 120,92	0.003797	ΔRGB(78,78,78)	antialiasing coverage residue on a shared outline
AntialiasCoverage	52,93 → 53,93	0.003797	ΔRGB(78,78,78)	antialiasing coverage residue on a shared outline
AntialiasCoverage	116,93 → 118,93	0.003797	ΔRGB(78,78,78)	antialiasing coverage residue on a shared outline
AntialiasCoverage	114,93 → 115,93	0.003797	ΔRGB(78,78,78)	antialiasing coverage residue on a shared outline
AntialiasCoverage	111,93 → 113,93	0.003797	ΔRGB(78,78,78)	antialiasing coverage residue on a shared outline
Extra	114,2 → 115,2	0.003164		candidate adds paint absent from reference (0.003164%)
Extra	52,2 → 54,2	0.003164		candidate adds paint absent from reference (0.003164%)
Extra	116,2 → 117,2	0.003164		candidate adds paint absent from reference (0.003164%)
Extra	50,2 → 52,2	0.003164		candidate adds paint absent from reference (0.003164%)
Extra	118,2 → 120,2	0.003164		candidate adds paint absent from reference (0.003164%)
Extra	48,3 → 49,3	0.003164		candidate adds paint absent from reference (0.003164%)
Extra	46,3 → 47,3	0.003164		candidate adds paint absent from reference (0.003164%)
Extra	0,27 → 0,28	0.003164		candidate adds paint absent from reference (0.003164%)
Extra	0,67 → 0,68	0.003164		candidate adds paint absent from reference (0.003164%)
AntialiasCoverage	67,16 → 68,16	0.003164	ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	101,16 → 103,16	0.003164	ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
ColorValue	113,17 → 115,17	0.003164	ΔRGB(0,1,0)	fill recolour ΔRGB(+0,+1,+0) (ΔE 0)
AntialiasCoverage	117,17 → 118,17	0.003164	ΔRGB(0,1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	166,20 → 167,21	0.003164	ΔRGB(11,11,11)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/background-clip-padding-box-elliptical-radius.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>background clip padding-box elliptical radius</title>
6<style>
7  @page { size: 224px 152px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 170px;
13    height: 95px;
14    margin: 25px;
15    padding: 10px;
16    border: 16px solid rgb(17 17 17 / 50%);
17    border-radius: 50% / 30%;
18    background: #e53935;
19    background-clip: padding-box;
20  }
21</style>
22</head>
23<body>
24  <div class="box"></div>
25</body>
26</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.13% · raw 0.13% (308 px) background-clip-padding-box-dashed-gradient · padding-box-dashed-gradientPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 18.2

why: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

background-clip:padding-box clips a gradient before dashed border gaps; catches border-box clipping that leaks red through the border.

regions (8 total; showing 8 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	8	308	0,0 → 140,90	101	total 0.2% · largest 0.08%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	0,0 → 16,16	0.08	ΔRGB(55,55,55)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,74 → 16,90	0.08	ΔRGB(55,55,55)	antialiasing coverage residue on a shared outline
AntialiasCoverage	124,0 → 140,0	0.04	ΔRGB(55,55,55)	antialiasing coverage residue on a shared outline
AntialiasCoverage	124,90 → 140,90	0.04	ΔRGB(55,55,55)	antialiasing coverage residue on a shared outline
AntialiasCoverage	16,16 → 16,16	0.000810	ΔRGB(-15,-7,-8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	124,16 → 124,16	0.000810	ΔRGB(-12,-1,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	16,74 → 16,74	0.000810	ΔRGB(-15,-7,-8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	124,74 → 124,74	0.000810	ΔRGB(-12,-1,-2)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/background-clip-padding-box-dashed-gradient.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>background clip padding-box dashed gradient</title>
6<style>
7  @page { size: 184px 136px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 140px;
13    height: 90px;
14    margin: 20px;
15    padding: 12px;
16    border: 16px dashed #111111;
17    background-image: linear-gradient(#e53935, #e53935);
18    background-clip: padding-box;
19  }
20</style>
21</head>
22<body>
23  <div class="box"></div>
24</body>
25</html>

PASS exact match background-clip-content-box-color · content-box-color

background-clip:content-box clips a solid background color to the content box; catches border-box clipping that fills padding.

PASS exact match background-clip-list-matching · layer-list-matching

Comma-separated background-clip values clip only the top layer to content-box over a blue border-box layer; catches single-clip implementations.

background-attachment — 100.00% verified visual parity PASS 2 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS exact match background-attachment-fixed-viewport · fixed-viewport

background-attachment:fixed anchors a split gradient to the page viewport; catches element-relative fixed positioning.

PASS exact match background-attachment-local-scroll-canvas · local-scroll-canvas

background-attachment:local positions a bottom stripe against the scrollable content canvas; catches aliases to scroll/static attachment.

background-blend-mode — 100.00% verified visual parity PASS 2 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS visually equivalent · no rejecting defect · thresholded evidence 0.22% · raw 44.32% (147374 px) background-blend-mode-list-matching · layer-list-matchingPASS via CSS-scale observation: sub-CSS shared-outline coverageColorValuemissing 0.3%ΔE 0.2

why: visually accepted coverage phase; raw fill recolour ΔRGB(+1,+0,+1) (ΔE 0.2)

Comma-separated background-blend-mode values keep the top red tile normal while multiplying the bottom blue layer into the yellow color; catches one global blend mode.

regions (2 total; showing 2 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	1	146811	4,4 → 176,106	146811	total 75.6% · largest 75.6% · max ΔE 0.2
Missing	1	563	0,110 → 180,110	563	total 0.3% · largest 0.3%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
ColorValue	4,4 → 176,106	75.6	ΔE 0.2 ΔRGB(1,0,1)	fill recolour ΔRGB(+1,+0,+1) (ΔE 0.2)
Missing	0,110 → 180,110	0.3		candidate lacks paint present in reference (0.3%)

source · cases/backgrounds-borders/background-blend-mode-list-matching.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>background blend mode list matching</title>
6<style>
7  @page { size: 224px 152px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 180px;
13    height: 110px;
14    margin: 20px;
15    background-color: #fdd835;
16    background-image:
17      url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAECAIAAAAmkwkpAAAAEElEQVR42mN4amkKRwzEcQAyMhUx4RYvKgAAAABJRU5ErkJggg=="),
18      url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAECAIAAAAmkwkpAAAAEElEQVR42mOQ63gKRwzEcQB1whixaofVswAAAABJRU5ErkJggg==");
19    background-size: 50px 50px, 180px 110px;
20    background-repeat: no-repeat, no-repeat;
21    background-position: left top, left top;
22    background-blend-mode: normal, multiply;
23    border: 4px solid #111111;
24  }
25</style>
26</head>
27<body>
28  <div class="box"></div>
29</body>
30</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.29% · raw 0.29% (626 px) background-blend-mode-multiply-image · multiply-image-colorPASS via CSS-scale observation: sub-CSS shared-outline coverageMissingmissing 0.7%

why: visually accepted coverage phase; raw candidate lacks paint present in reference (0.7%)

background-blend-mode:multiply blends a blue image layer with a yellow background color; catches engines that paint the image normally.

regions (1 total; showing 1 representative)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
Missing	1	626	0,0 → 120,80	626	total 0.7% · largest 0.7%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
Missing	0,0 → 120,80	0.7		candidate lacks paint present in reference (0.7%)

source · cases/backgrounds-borders/background-blend-mode-multiply-image.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>background blend mode multiply image</title>
6<style>
7  @page { size: 184px 120px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 120px;
13    height: 80px;
14    margin: 20px;
15    background-color: #fdd835;
16    background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAECAIAAAAmkwkpAAAAEElEQVR42mOQ63gKRwzEcQB1whixaofVswAAAABJRU5ErkJggg==");
17    background-size: 120px 80px;
18    background-repeat: no-repeat;
19    background-blend-mode: multiply;
20    border: 4px solid #111111;
21  }
22</style>
23</head>
24<body>
25  <div class="box"></div>
26</body>
27</html>

background-color — 100.00% verified visual parity PASS 2 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS exact match background-color-rgba · rgba-alpha

Semi-transparent rgba() box composited over a solid background box.

PASS exact match background-color-solid · solid

Single box filled with a solid opaque background-color.

background-image — 100.00% verified visual parity PASS 3 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS visually equivalent · no rejecting defect · thresholded evidence 0.18% · raw 0.18% (587 px) background-image-nonuniform-radius-clip · nonuniform-radius-clippingPASS via CSS-scale observation: stable same-coordinate outline phaseAntialiasCoveragemissing 0.000622%extra 0.001865%ΔE 48.3

why: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

A raster background is clipped by four unequal border radii; catches unclipped or uniform-radius image clipping.

regions (89 total; showing 64 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	85	583	0,0 → 170,100	474	total 0.4% · largest 0.3%
Missing	1	1	0,97 → 0,97	1	total 0.000601% · largest 0.000601%
Extra	3	3	1,99 → 1,99	1	total 0.001802% · largest 0.000601%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	6,85 → 157,85	0.3	ΔRGB(223,80,-176)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,97 → 1,98	0.003003	ΔRGB(-9,-9,-9)	antialiasing coverage residue on a shared outline
AntialiasCoverage	27,2 → 28,2	0.001802	ΔRGB(17,17,17)	antialiasing coverage residue on a shared outline
AntialiasCoverage	169,4 → 169,4	0.001802	ΔRGB(-17,-17,-17)	antialiasing coverage residue on a shared outline
AntialiasCoverage	2,27 → 2,28	0.001802	ΔRGB(17,17,17)	antialiasing coverage residue on a shared outline
AntialiasCoverage	3,100 → 4,100	0.001802	ΔRGB(-54,-54,-54)	antialiasing coverage residue on a shared outline
AntialiasCoverage	162,0 → 163,0	0.001201	ΔRGB(-20,-20,-20)	antialiasing coverage residue on a shared outline
AntialiasCoverage	163,0 → 164,0	0.001201	ΔRGB(-14,-14,-14)	antialiasing coverage residue on a shared outline
AntialiasCoverage	164,0 → 164,0	0.001201	ΔRGB(-17,-17,-17)	antialiasing coverage residue on a shared outline
AntialiasCoverage	166,1 → 166,1	0.001201	ΔRGB(-12,-12,-12)	antialiasing coverage residue on a shared outline
AntialiasCoverage	167,2 → 167,2	0.001201	ΔRGB(-9,-9,-9)	antialiasing coverage residue on a shared outline
AntialiasCoverage	168,3 → 168,3	0.001201	ΔRGB(-7,-7,-7)	antialiasing coverage residue on a shared outline
AntialiasCoverage	35,6 → 35,6	0.001201	ΔRGB(0,-5,-9)	antialiasing coverage residue on a shared outline
AntialiasCoverage	170,6 → 170,7	0.001201	ΔRGB(-4,-4,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	6,35 → 6,35	0.001201	ΔRGB(0,-5,-9)	antialiasing coverage residue on a shared outline
AntialiasCoverage	161,79 → 161,79	0.001201	ΔRGB(-4,-4,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,96 → 0,97	0.001201	ΔRGB(-83,-83,-83)	antialiasing coverage residue on a shared outline
AntialiasCoverage	2,99 → 2,99	0.001201	ΔRGB(-22,-22,-22)	antialiasing coverage residue on a shared outline
AntialiasCoverage	2,100 → 3,100	0.001201	ΔRGB(48,48,48)	antialiasing coverage residue on a shared outline
Missing	0,97 → 0,97	0.000601		candidate lacks paint present in reference (0.000601%)
Extra	1,99 → 1,99	0.000601		candidate adds paint absent from reference (0.000601%)
Extra	1,99 → 1,99	0.000601		candidate adds paint absent from reference (0.000601%)
Extra	1,99 → 1,99	0.000601		candidate adds paint absent from reference (0.000601%)
AntialiasCoverage	35,0 → 35,0	0.000601	ΔRGB(9,9,9)	antialiasing coverage residue on a shared outline
AntialiasCoverage	37,0 → 37,0	0.000601	ΔRGB(17,17,17)	antialiasing coverage residue on a shared outline
AntialiasCoverage	38,0 → 38,0	0.000601	ΔRGB(21,21,21)	antialiasing coverage residue on a shared outline
AntialiasCoverage	33,0 → 33,0	0.000601	ΔRGB(7,7,7)	antialiasing coverage residue on a shared outline
AntialiasCoverage	35,0 → 35,0	0.000601	ΔRGB(20,20,20)	antialiasing coverage residue on a shared outline
AntialiasCoverage	33,1 → 33,1	0.000601	ΔRGB(22,22,22)	antialiasing coverage residue on a shared outline
AntialiasCoverage	31,1 → 31,1	0.000601	ΔRGB(20,20,20)	antialiasing coverage residue on a shared outline
AntialiasCoverage	29,1 → 29,1	0.000601	ΔRGB(14,14,14)	antialiasing coverage residue on a shared outline
AntialiasCoverage	166,1 → 166,1	0.000601	ΔRGB(-19,-19,-19)	antialiasing coverage residue on a shared outline
AntialiasCoverage	28,2 → 28,2	0.000601	ΔRGB(21,21,21)	antialiasing coverage residue on a shared outline
AntialiasCoverage	167,2 → 167,2	0.000601	ΔRGB(-12,-12,-12)	antialiasing coverage residue on a shared outline
AntialiasCoverage	26,2 → 26,2	0.000601	ΔRGB(9,9,9)	antialiasing coverage residue on a shared outline
AntialiasCoverage	168,3 → 168,3	0.000601	ΔRGB(-22,-22,-22)	antialiasing coverage residue on a shared outline
AntialiasCoverage	24,3 → 24,3	0.000601	ΔRGB(14,14,14)	antialiasing coverage residue on a shared outline
AntialiasCoverage	169,3 → 169,3	0.000601	ΔRGB(-4,-4,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	20,5 → 20,5	0.000601	ΔRGB(20,20,20)	antialiasing coverage residue on a shared outline
AntialiasCoverage	20,5 → 20,5	0.000601	ΔRGB(18,18,18)	antialiasing coverage residue on a shared outline
AntialiasCoverage	170,5 → 170,5	0.000601	ΔRGB(-22,-22,-22)	antialiasing coverage residue on a shared outline
AntialiasCoverage	19,6 → 19,6	0.000601	ΔRGB(14,14,14)	antialiasing coverage residue on a shared outline
AntialiasCoverage	170,6 → 170,6	0.000601	ΔRGB(-21,-21,-21)	antialiasing coverage residue on a shared outline
AntialiasCoverage	18,6 → 18,6	0.000601	ΔRGB(17,17,17)	antialiasing coverage residue on a shared outline
AntialiasCoverage	163,6 → 163,6	0.000601	ΔRGB(7,5,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	17,7 → 17,7	0.000601	ΔRGB(10,10,10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	164,7 → 164,7	0.000601	ΔRGB(20,18,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	17,7 → 17,7	0.000601	ΔRGB(20,20,20)	antialiasing coverage residue on a shared outline
AntialiasCoverage	170,7 → 170,7	0.000601	ΔRGB(-28,-28,-28)	antialiasing coverage residue on a shared outline
AntialiasCoverage	15,8 → 15,8	0.000601	ΔRGB(4,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	26,9 → 26,9	0.000601	ΔRGB(-1,-7,-13)	antialiasing coverage residue on a shared outline
AntialiasCoverage	14,10 → 14,10	0.000601	ΔRGB(39,39,39)	antialiasing coverage residue on a shared outline
AntialiasCoverage	12,11 → 12,11	0.000601	ΔRGB(22,22,22)	antialiasing coverage residue on a shared outline
AntialiasCoverage	11,12 → 11,12	0.000601	ΔRGB(22,22,22)	antialiasing coverage residue on a shared outline
AntialiasCoverage	10,14 → 10,14	0.000601	ΔRGB(39,39,39)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,15 → 8,15	0.000601	ΔRGB(4,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	7,17 → 7,17	0.000601	ΔRGB(20,20,20)	antialiasing coverage residue on a shared outline
AntialiasCoverage	7,17 → 7,17	0.000601	ΔRGB(10,10,10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	6,18 → 6,18	0.000601	ΔRGB(17,17,17)	antialiasing coverage residue on a shared outline
AntialiasCoverage	6,19 → 6,19	0.000601	ΔRGB(14,14,14)	antialiasing coverage residue on a shared outline
AntialiasCoverage	5,20 → 5,20	0.000601	ΔRGB(18,18,18)	antialiasing coverage residue on a shared outline
AntialiasCoverage	5,20 → 5,20	0.000601	ΔRGB(20,20,20)	antialiasing coverage residue on a shared outline
AntialiasCoverage	3,24 → 3,24	0.000601	ΔRGB(14,14,14)	antialiasing coverage residue on a shared outline
AntialiasCoverage	2,26 → 2,26	0.000601	ΔRGB(9,9,9)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/background-image-nonuniform-radius-clip.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>background image nonuniform radius clip</title>
6<style>
7  @page { size: 224px 152px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 170px;
13    height: 100px;
14    margin: 25px;
15    background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAECAIAAAAmkwkpAAAAHElEQVR42mOQ63gKRH9vmAIRAwoHQj21BCEUDgDmhhvJOJwkcAAAAABJRU5ErkJggg==");
16    background-size: cover;
17    background-repeat: no-repeat;
18    border: 6px solid #111111;
19    border-radius: 40px 8px 32px 4px;
20  }
21</style>
22</head>
23<body>
24  <div class="box"></div>
25</body>
26</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.12% · raw 0.12% (252 px) background-image-image-set · image-setPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 22.2

why: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

background-image:image-set() paints its selected candidate; catches parsers that drop image-set() and leave the box white.

regions (2 total; showing 2 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	2	252	24,24 → 64,64	126	total 0.3% · largest 0.2%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	24,24 → 24,64	0.2	ΔRGB(9,69,70)	antialiasing coverage residue on a shared outline
AntialiasCoverage	64,24 → 64,64	0.2	ΔRGB(16,128,130)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/background-image-image-set.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>background image image-set</title>
6<style>
7  @page { size: 184px 120px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 100px;
13    height: 80px;
14    margin: 20px;
15    background-image: image-set(url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAECAIAAAAmkwkpAAAAEElEQVR42mN4amkKRwzEcQAyMhUx4RYvKgAAAABJRU5ErkJggg==") 1x);
16    background-size: 40px 40px;
17    background-repeat: no-repeat;
18    background-position: 20px 20px;
19    border: 4px solid #111111;
20  }
21</style>
22</head>
23<body>
24  <div class="box"></div>
25</body>
26</html>

PASS exact match background-image-none-layer-list · none-layer-list-matching

A none background layer still consumes matching size/repeat/position list entries; catches implementations that drop none before list matching.

background-layer-order — 100.00% verified visual parity PASS 1 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS visually equivalent · no rejecting defect · thresholded evidence 0.08% · raw 0.08% (219 px) background-layer-order-raster-gradient · gradient-over-rasterPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 12.7

why: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

A top red gradient layer covers a bottom blue raster at the same corner; catches fixed slot painters that put raster over gradient.

regions (1 total; showing 1 representative)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	1	219	74,4 → 74,74	219	total 0.2% · largest 0.2%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	74,4 → 74,74	0.2	ΔRGB(78,41,9)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/background-layer-order-raster-gradient.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>background layer order raster gradient</title>
6<style>
7  @page { size: 200px 136px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 160px;
13    height: 90px;
14    margin: 20px;
15    background-image:
16      linear-gradient(#e53935, #e53935),
17      url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAECAIAAAAmkwkpAAAAEElEQVR42mOQ63gKRwzEcQB1whixaofVswAAAABJRU5ErkJggg==");
18    background-size: 50px 50px, 70px 70px;
19    background-repeat: no-repeat, no-repeat;
20    background-position: left top, left top;
21    border: 4px solid #111111;
22  }
23</style>
24</head>
25<body>
26  <div class="box"></div>
27</body>
28</html>

background-origin — 100.00% verified visual parity PASS 2 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS visually equivalent · no rejecting defect · thresholded evidence 0.05% · raw 0.05% (178 px) background-origin-list-matching · layer-list-matchingPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 34.2

why: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

Comma-separated background-origin values position two image layers from different boxes; catches implementations with one origin for all layers.

regions (2 total; showing 2 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	2	178	36,36 → 64,64	89	total 0.09% · largest 0.05%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	36,36 → 36,64	0.05	ΔRGB(22,173,176)	antialiasing coverage residue on a shared outline
AntialiasCoverage	64,36 → 64,64	0.05	ΔRGB(16,128,130)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/background-origin-list-matching.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>background origin list matching</title>
6<style>
7  @page { size: 224px 152px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 180px;
13    height: 110px;
14    margin: 20px;
15    padding: 24px;
16    border: 12px solid #111111;
17    background-image:
18      url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAECAIAAAAmkwkpAAAAEElEQVR42mN4amkKRwzEcQAyMhUx4RYvKgAAAABJRU5ErkJggg=="),
19      url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAECAIAAAAmkwkpAAAAEElEQVR42mOQ63gKRwzEcQB1whixaofVswAAAABJRU5ErkJggg==");
20    background-size: 28px 28px, 28px 28px;
21    background-repeat: no-repeat, no-repeat;
22    background-position: left top, left top;
23    background-origin: content-box, border-box;
24  }
25</style>
26</head>
27<body>
28  <div class="box"></div>
29</body>
30</html>

PASS exact match background-origin-border-box · border-box

background-origin:border-box positions a tile from the outer border edge; catches implementations that always use padding-box.

background-position — 100.00% verified visual parity PASS 2 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS visually equivalent · no rejecting defect · thresholded evidence 0.07% · raw 0.07% (190 px) background-position-xy-longhands · x-y-longhandsPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 27.3

why: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

background-position-x and background-position-y independently place a tile at fixed offsets; catches engines that ignore the longhands.

regions (2 total; showing 2 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	2	190	84,34 → 114,64	95	total 0.1% · largest 0.07%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	84,34 → 84,64	0.07	ΔRGB(22,173,176)	antialiasing coverage residue on a shared outline
AntialiasCoverage	114,34 → 114,64	0.07	ΔRGB(9,69,70)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/background-position-xy-longhands.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>background position x y longhands</title>
6<style>
7  @page { size: 200px 136px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 160px;
13    height: 90px;
14    margin: 20px;
15    background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAECAIAAAAmkwkpAAAAEElEQVR42mN4amkKRwzEcQAyMhUx4RYvKgAAAABJRU5ErkJggg==");
16    background-size: 30px 30px;
17    background-repeat: no-repeat;
18    background-position-x: 80px;
19    background-position-y: 30px;
20    border: 4px solid #111111;
21  }
22</style>
23</head>
24<body>
25  <div class="box"></div>
26</body>
27</html>

PASS exact match background-position-edge-offsets · four-value-edge-offsets

background-position: right 20px bottom 15px anchors a tile from named edges; catches one/two-value parsers that fall back to top-left.

background-repeat — 100.00% verified visual parity PASS 3 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS visually equivalent · no rejecting defect · thresholded evidence 0% · raw 3.61% (6500 px) background-repeat-space-round · space-roundPASS via raw same-coordinate visibility policyColorValueΔE 0.2

why: fill recolour ΔRGB(+0,-1,+0) (ΔE 0.2)

background-repeat: space distributes four 40px columns with 8px gaps while round scales 24px images into three 26.666px rows.

regions (12 total; showing 12 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	12	6500	0,17 → 184,72	625	total 4.5% · largest 0.4% · max ΔE 0.3

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
ColorValue	0,70 → 40,72	0.4	ΔE 0.2 ΔRGB(0,-1,0)	fill recolour ΔRGB(+0,-1,+0) (ΔE 0.2)
ColorValue	48,70 → 88,72	0.4	ΔE 0.2 ΔRGB(0,-1,0)	fill recolour ΔRGB(+0,-1,+0) (ΔE 0.2)
ColorValue	96,70 → 136,72	0.4	ΔE 0.2 ΔRGB(0,-1,0)	fill recolour ΔRGB(+0,-1,+0) (ΔE 0.2)
ColorValue	144,70 → 184,72	0.4	ΔE 0.2 ΔRGB(0,-1,0)	fill recolour ΔRGB(+0,-1,+0) (ΔE 0.2)
ColorValue	0,17 → 40,18	0.3	ΔE 0.2 ΔRGB(0,-1,0)	fill recolour ΔRGB(+0,-1,+0) (ΔE 0.2)
ColorValue	48,17 → 88,18	0.3	ΔE 0.2 ΔRGB(0,-1,0)	fill recolour ΔRGB(+0,-1,+0) (ΔE 0.2)
ColorValue	96,17 → 136,18	0.3	ΔE 0.2 ΔRGB(0,-1,0)	fill recolour ΔRGB(+0,-1,+0) (ΔE 0.2)
ColorValue	144,17 → 184,18	0.3	ΔE 0.2 ΔRGB(0,-1,0)	fill recolour ΔRGB(+0,-1,+0) (ΔE 0.2)
ColorValue	0,44 → 40,45	0.3	ΔE 0.3 ΔRGB(-1,-1,-1)	fill recolour ΔRGB(-1,-1,-1) (ΔE 0.3)
ColorValue	48,44 → 88,45	0.3	ΔE 0.3 ΔRGB(-1,-1,-1)	fill recolour ΔRGB(-1,-1,-1) (ΔE 0.3)
ColorValue	96,44 → 136,45	0.3	ΔE 0.3 ΔRGB(-1,-1,-1)	fill recolour ΔRGB(-1,-1,-1) (ΔE 0.3)
ColorValue	144,44 → 184,45	0.3	ΔE 0.3 ΔRGB(-1,-1,-1)	fill recolour ΔRGB(-1,-1,-1) (ΔE 0.3)

source · cases/backgrounds-borders/background-repeat-space-round.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>background-repeat space round</title>
6<style>
7  @page { size: 192px 96px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 184px;
13    height: 80px;
14    background-color: #e8f5e9;
15    background-image: linear-gradient(to bottom, #c62828 0 18px, #ffd54f 18px 24px);
16    background-size: 40px 24px;
17    background-repeat: space round;
18  }
19</style>
20</head>
21<body>
22  <div class="box"></div>
23</body>
24</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.002783% · raw 0.002783% (6 px) background-repeat-repeat-x-no-repeat-y · repeat-no-repeat-two-keywordPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 7.8

why: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

background-repeat:repeat no-repeat repeats a tile only horizontally; catches parsers that collapse the two-keyword value to full repeat.

regions (6 total; showing 6 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	6	6	24,4 → 104,24	1	total 0.005479% · largest 0.000913%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	24,4 → 24,4	0.000913	ΔRGB(5,35,36)	antialiasing coverage residue on a shared outline
AntialiasCoverage	64,4 → 64,4	0.000913	ΔRGB(5,35,36)	antialiasing coverage residue on a shared outline
AntialiasCoverage	104,4 → 104,4	0.000913	ΔRGB(5,35,36)	antialiasing coverage residue on a shared outline
AntialiasCoverage	24,24 → 24,24	0.000913	ΔRGB(5,35,36)	antialiasing coverage residue on a shared outline
AntialiasCoverage	64,24 → 64,24	0.000913	ΔRGB(5,35,36)	antialiasing coverage residue on a shared outline
AntialiasCoverage	104,24 → 104,24	0.000913	ΔRGB(5,35,36)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/background-repeat-repeat-x-no-repeat-y.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>background repeat repeat-x no-repeat-y</title>
6<style>
7  @page { size: 184px 120px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 140px;
13    height: 80px;
14    margin: 20px;
15    background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAECAIAAAAmkwkpAAAAEElEQVR42mN4amkKRwzEcQAyMhUx4RYvKgAAAABJRU5ErkJggg==");
16    background-size: 20px 20px;
17    background-repeat: repeat no-repeat;
18    border: 4px solid #111111;
19  }
20</style>
21</head>
22<body>
23  <div class="box"></div>
24</body>
25</html>

PASS exact match background-invalid-repeat-preserves-no-repeat · invalid-declaration-discard

A later invalid background-repeat declaration is discarded, so the earlier no-repeat value keeps the sized gradient in the first tile only.

background-shorthand — 100.00% verified visual parity PASS 4 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS visually equivalent · no rejecting defect · thresholded evidence 0.10% · raw 0.10% (289 px) background-shorthand-visual-box-single · single-visual-boxPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 17.1

why: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

The background shorthand with one visual-box sets both origin and clip to content-box; catches shorthands that set only one of them.

regions (9 total; showing 9 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	9	289	0,0 → 170,100	95	total 0.2% · largest 0.06%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	65,35 → 65,65	0.06	ΔRGB(9,69,70)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,0 → 10,10	0.04	ΔRGB(55,55,55)	antialiasing coverage residue on a shared outline
AntialiasCoverage	160,0 → 170,10	0.04	ΔRGB(55,55,55)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,90 → 0,100	0.02	ΔRGB(55,55,55)	antialiasing coverage residue on a shared outline
AntialiasCoverage	170,90 → 170,100	0.02	ΔRGB(55,55,55)	antialiasing coverage residue on a shared outline
AntialiasCoverage	10,10 → 10,10	0.000601	ΔRGB(-6,-6,-6)	antialiasing coverage residue on a shared outline
AntialiasCoverage	160,10 → 160,10	0.000601	ΔRGB(-6,-6,-6)	antialiasing coverage residue on a shared outline
AntialiasCoverage	10,90 → 10,90	0.000601	ΔRGB(-11,-11,-11)	antialiasing coverage residue on a shared outline
AntialiasCoverage	160,90 → 160,90	0.000601	ΔRGB(-11,-11,-11)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/background-shorthand-visual-box-single.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>background shorthand visual box single</title>
6<style>
7  @page { size: 216px 144px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 170px;
13    height: 100px;
14    margin: 20px;
15    padding: 25px;
16    border: 10px dashed #111111;
17    background: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAECAIAAAAmkwkpAAAAEElEQVR42mN4amkKRwzEcQAyMhUx4RYvKgAAAABJRU5ErkJggg==") left top / 30px 30px no-repeat content-box;
18  }
19</style>
20</head>
21<body>
22  <div class="box"></div>
23</body>
24</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.06% · raw 0.06% (194 px) background-shorthand-origin-clip-pair · origin-clip-visual-box-pairPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 18.1

why: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

The background shorthand with border-box content-box positions from border-box and clips to content-box; catches reversed or collapsed visual-box parsing.

regions (8 total; showing 8 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	8	194	0,0 → 170,100	63	total 0.1% · largest 0.04%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	0,0 → 10,10	0.04	ΔRGB(55,55,55)	antialiasing coverage residue on a shared outline
AntialiasCoverage	160,0 → 170,10	0.04	ΔRGB(55,55,55)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,90 → 0,100	0.02	ΔRGB(55,55,55)	antialiasing coverage residue on a shared outline
AntialiasCoverage	170,90 → 170,100	0.02	ΔRGB(55,55,55)	antialiasing coverage residue on a shared outline
AntialiasCoverage	10,10 → 10,10	0.000601	ΔRGB(-6,-6,-6)	antialiasing coverage residue on a shared outline
AntialiasCoverage	160,10 → 160,10	0.000601	ΔRGB(-6,-6,-6)	antialiasing coverage residue on a shared outline
AntialiasCoverage	10,90 → 10,90	0.000601	ΔRGB(-11,-11,-11)	antialiasing coverage residue on a shared outline
AntialiasCoverage	160,90 → 160,90	0.000601	ΔRGB(-11,-11,-11)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/background-shorthand-origin-clip-pair.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>background shorthand origin clip pair</title>
6<style>
7  @page { size: 216px 144px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 170px;
13    height: 100px;
14    margin: 20px;
15    padding: 25px;
16    border: 10px dashed #111111;
17    background: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAECAIAAAAmkwkpAAAAEElEQVR42mN4amkKRwzEcQAyMhUx4RYvKgAAAABJRU5ErkJggg==") left top / 80px 80px no-repeat border-box content-box;
18  }
19</style>
20</head>
21<body>
22  <div class="box"></div>
23</body>
24</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.03% · raw 0.03% (101 px) background-shorthand-multiple-layers-color · multiple-layers-final-colorPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 23.8

why: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

The background shorthand accepts multiple image layers plus a final background color; catches one-layer parsers that drop a tile or the color.

regions (1 total; showing 1 representative)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	1	101	144,74 → 144,106	101	total 0.05% · largest 0.05%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	144,74 → 144,106	0.05	ΔRGB(77,27,-62)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/background-shorthand-multiple-layers-color.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>background shorthand multiple layers color</title>
6<style>
7  @page { size: 224px 152px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 180px;
13    height: 110px;
14    margin: 20px;
15    background:
16      url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAECAIAAAAmkwkpAAAAEElEQVR42mN4amkKRwzEcQAyMhUx4RYvKgAAAABJRU5ErkJggg==") left top / 32px 32px no-repeat,
17      url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAECAIAAAAmkwkpAAAAEElEQVR42mOQ63gKRwzEcQB1whixaofVswAAAABJRU5ErkJggg==") right bottom / 32px 32px no-repeat #fdd835;
18    border: 4px solid #111111;
19  }
20</style>
21</head>
22<body>
23  <div class="box"></div>
24</body>
25</html>

PASS exact match background-shorthand-reset-longhands · reset-longhands

A later background shorthand resets earlier image, repeat, size, origin, and clip longhands; catches stale red image or stale content-box clipping.

background-size — 100.00% verified visual parity PASS 1 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS exact match background-size-auto-length · auto-length-intrinsic-ratio

background-size: auto 60px preserves the image intrinsic ratio; catches implementations that treat mixed auto/length as plain auto.

body-background-canvas-propagation — 100.00% verified visual parity PASS 1 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS exact match body-background-canvas-propagation · transparent-root

The body background propagates to the page canvas when the html background is transparent; catches body-only painting that leaves page margins white.

border — 100.00% verified visual parity PASS 6 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS visually equivalent · no rejecting defect · thresholded evidence 0.38% · raw 0.38% (3570 px) border-logical-cascade-writing-modes · logical-physical-cascade-writing-modesPASS via CSS-scale observation: one-sided sub-CSS outline coverageAntialiasCoverageextra 0.6%ΔE 0.7

why: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

Logical border sides and radii share declaration order with physical longhands and map through horizontal LTR, horizontal RTL, vertical-lr, and sideways-lr writing modes.

regions (139 total; showing 64 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	135	2552	0,0 → 312,212	437	total 0.4% · largest 0.07% · max ΔE 0.7
Extra	4	1018	0,80 → 312,212	412	total 0.2% · largest 0.06%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	180,80 → 312,88	0.07	ΔRGB(-4,-4,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	7,0 → 140,0	0.06	ΔRGB(-5,-5,-4)	antialiasing coverage residue on a shared outline
Extra	0,212 → 132,212	0.06		candidate adds paint absent from reference (0.06%)
Extra	193,212 → 312,212	0.06		candidate adds paint absent from reference (0.06%)
AntialiasCoverage	185,132 → 304,132	0.06	ΔRGB(-11,-9,-8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	14,80 → 132,80	0.06	ΔRGB(-4,-4,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	172,0 → 287,0	0.06	ΔRGB(-5,-5,-4)	antialiasing coverage residue on a shared outline
Extra	0,138 → 0,212	0.04		candidate adds paint absent from reference (0.04%)
AntialiasCoverage	180,8 → 180,80	0.03	ΔRGB(-11,-9,-8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	304,201 → 312,212	0.009104	ΔRGB(-28,-24,-22)	antialiasing coverage residue on a shared outline
AntialiasCoverage	293,4 → 305,10	0.008487	ΔRGB(20,37,8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	172,124 → 173,132	0.004166	ΔRGB(8,8,7)	antialiasing coverage residue on a shared outline
AntialiasCoverage	304,124 → 312,124	0.004012	ΔRGB(9,8,6)	antialiasing coverage residue on a shared outline
AntialiasCoverage	172,80 → 172,88	0.003858	ΔRGB(9,8,6)	antialiasing coverage residue on a shared outline
AntialiasCoverage	2,2 → 3,3	0.000772	ΔRGB(7,6,6)	antialiasing coverage residue on a shared outline
AntialiasCoverage	1,4 → 1,5	0.000772	ΔRGB(7,6,6)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,5 → 0,6	0.000772	ΔRGB(7,6,5)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,88 → 1,88	0.000463	ΔRGB(2,3,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	301,2 → 301,2	0.000309	ΔRGB(2,3,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,3 → 4,3	0.000309	ΔRGB(4,3,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	5,3 → 5,3	0.000309	ΔRGB(4,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	1,3 → 1,4	0.000309	ΔRGB(6,5,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	6,4 → 7,4	0.000309	ΔRGB(4,3,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	7,4 → 7,4	0.000309	ΔRGB(4,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	9,5 → 9,5	0.000309	ΔRGB(3,2,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	9,5 → 10,5	0.000309	ΔRGB(3,3,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	11,6 → 11,6	0.000309	ΔRGB(3,2,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	12,7 → 12,7	0.000309	ΔRGB(3,3,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	13,8 → 13,8	0.000309	ΔRGB(3,2,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	14,8 → 14,8	0.000309	ΔRGB(3,3,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	13,81 → 13,81	0.000309	ΔRGB(3,2,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	12,82 → 12,82	0.000309	ΔRGB(3,3,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	11,82 → 11,82	0.000309	ΔRGB(3,2,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	9,83 → 10,83	0.000309	ΔRGB(3,3,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	9,83 → 9,83	0.000309	ΔRGB(3,2,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	7,84 → 7,84	0.000309	ΔRGB(4,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	6,84 → 7,84	0.000309	ΔRGB(4,3,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	5,85 → 5,85	0.000309	ΔRGB(4,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,86 → 4,86	0.000309	ΔRGB(4,3,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	3,87 → 3,87	0.000309	ΔRGB(4,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	2,87 → 2,87	0.000309	ΔRGB(4,3,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	174,125 → 174,125	0.000309	ΔRGB(3,3,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	176,126 → 176,126	0.000309	ΔRGB(4,4,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	177,127 → 177,127	0.000309	ΔRGB(4,4,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	178,128 → 179,128	0.000309	ΔRGB(3,3,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	180,129 → 180,129	0.000309	ΔRGB(3,3,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	181,130 → 181,130	0.000309	ΔRGB(3,3,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	182,131 → 183,131	0.000309	ΔRGB(2,2,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	184,132 → 184,132	0.000309	ΔRGB(3,3,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	12,204 → 13,204	0.000309	ΔRGB(2,2,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	11,205 → 11,205	0.000309	ΔRGB(3,3,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	10,206 → 10,206	0.000309	ΔRGB(3,3,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,207 → 9,207	0.000309	ΔRGB(2,2,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	7,208 → 7,208	0.000309	ΔRGB(3,3,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	6,209 → 6,209	0.000309	ΔRGB(4,4,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,210 → 4,210	0.000309	ΔRGB(2,2,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	3,211 → 3,211	0.000309	ΔRGB(4,4,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	2,211 → 2,211	0.000309	ΔRGB(4,4,3)	antialiasing coverage residue on a shared outline
Extra	180,80 → 180,80	0.000154		candidate adds paint absent from reference (0.000154%)
AntialiasCoverage	293,0 → 293,0	0.000154	ΔRGB(1,1,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	3,2 → 3,2	0.000154	ΔRGB(3,1,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	3,2 → 3,2	0.000154	ΔRGB(7,5,5)	antialiasing coverage residue on a shared outline
AntialiasCoverage	300,2 → 300,2	0.000154	ΔRGB(4,3,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,2 → 4,2	0.000154	ΔRGB(7,5,5)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/border-logical-cascade-writing-modes.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>logical border cascade across writing modes</title>
6<style>
7  @page { size: 360px 264px; margin: 0; }
8  html, body { width: 360px; height: 260px; background: #fff; }
9  html, body, div { box-sizing: border-box; margin: 0; padding: 0; }
10  .box { position: absolute; width: 140px; height: 88px; border: 8px solid #d9dee3; background: #f6f7f8; }
11  .horizontal { left: 24px; top: 24px; border-inline-start: 14px solid #e63946; border-left-color: #315fce; border-start-start-radius: 28px 16px; border-top-left-radius: 7px; }
12  .rtl { direction: rtl; left: 196px; top: 24px; border-right: 6px solid #2a9d8f; border-inline-start-width: 16px; border-inline-start-color: #7b2cbf; border-start-start-radius: 25px 13px; }
13  .vertical { writing-mode: vertical-lr; left: 24px; top: 148px; border-block-start: 13px solid #f4a261; border-inline-start: 11px solid #264653; border-start-start-radius: 24px 14px; }
14  .sideways { writing-mode: sideways-lr; left: 196px; top: 148px; border-block-start: 13px solid #f4a261; border-inline-start: 11px solid #264653; border-start-start-radius: 24px 14px; }
15</style>
16</head>
17<body>
18  <div class="box horizontal"></div>
19  <div class="box rtl"></div>
20  <div class="box vertical"></div>
21  <div class="box sideways"></div>
22</body>
23</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.36% · raw 0.36% (1262 px) border-per-side-colors · per-side-width-colorPASS via CSS-scale observation: sub-CSS shared-outline coverageAntialiasCoveragemissing 1.0%ΔE 14.8

why: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

Box with four different per-side border widths and colors.

regions (65 total; showing 64 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	64	713	0,0 → 200,120	613	total 0.3% · largest 0.3%
Missing	1	549	16,4 → 191,4	549	total 0.2% · largest 0.2%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	16,108 → 200,120	0.3	ΔRGB(-72,-53,2)	antialiasing coverage residue on a shared outline
Missing	16,4 → 191,4	0.2		candidate lacks paint present in reference (0.2%)
ColorValue	0,0 → 1,0	0.000853	ΔRGB(-6,-43,-42)	fill recolour ΔRGB(-6,-43,-42) (ΔE 0)
ColorValue	199,0 → 200,0	0.000853	ΔRGB(-2,-18,-18)	fill recolour ΔRGB(-2,-18,-18) (ΔE 0)
ColorValue	2,0 → 2,0	0.000853	ΔRGB(-6,-43,-42)	fill recolour ΔRGB(-6,-43,-42) (ΔE 0)
ColorValue	199,0 → 199,0	0.000853	ΔRGB(-2,-18,-18)	fill recolour ΔRGB(-2,-18,-18) (ΔE 0)
ColorValue	3,1 → 3,1	0.000853	ΔRGB(-6,-43,-42)	fill recolour ΔRGB(-6,-43,-42) (ΔE 0)
ColorValue	198,1 → 198,1	0.000853	ΔRGB(-2,-18,-18)	fill recolour ΔRGB(-2,-18,-18) (ΔE 0)
AntialiasCoverage	4,1 → 4,1	0.000853	ΔRGB(-6,-43,-42)	antialiasing coverage residue on a shared outline
AntialiasCoverage	197,1 → 198,1	0.000853	ΔRGB(-2,-18,-18)	antialiasing coverage residue on a shared outline
AntialiasCoverage	5,1 → 6,1	0.000853	ΔRGB(-6,-43,-42)	antialiasing coverage residue on a shared outline
AntialiasCoverage	197,1 → 197,1	0.000853	ΔRGB(-2,-18,-18)	antialiasing coverage residue on a shared outline
AntialiasCoverage	7,2 → 7,2	0.000853	ΔRGB(-6,-43,-42)	antialiasing coverage residue on a shared outline
AntialiasCoverage	196,2 → 196,2	0.000853	ΔRGB(-2,-18,-18)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,2 → 8,2	0.000853	ΔRGB(-6,-43,-42)	antialiasing coverage residue on a shared outline
AntialiasCoverage	196,2 → 196,2	0.000853	ΔRGB(-2,-18,-18)	antialiasing coverage residue on a shared outline
AntialiasCoverage	9,2 → 10,2	0.000853	ΔRGB(-6,-43,-42)	antialiasing coverage residue on a shared outline
AntialiasCoverage	195,2 → 195,2	0.000853	ΔRGB(-2,-18,-18)	antialiasing coverage residue on a shared outline
AntialiasCoverage	11,3 → 11,3	0.000853	ΔRGB(-6,-43,-42)	antialiasing coverage residue on a shared outline
AntialiasCoverage	194,3 → 195,3	0.000853	ΔRGB(-2,-18,-18)	antialiasing coverage residue on a shared outline
AntialiasCoverage	12,3 → 12,3	0.000853	ΔRGB(-6,-43,-42)	antialiasing coverage residue on a shared outline
AntialiasCoverage	194,3 → 194,3	0.000853	ΔRGB(-2,-18,-18)	antialiasing coverage residue on a shared outline
AntialiasCoverage	13,3 → 13,3	0.000853	ΔRGB(-6,-43,-42)	antialiasing coverage residue on a shared outline
AntialiasCoverage	193,3 → 193,3	0.000853	ΔRGB(-2,-18,-18)	antialiasing coverage residue on a shared outline
AntialiasCoverage	14,4 → 15,4	0.000853	ΔRGB(-6,-43,-42)	antialiasing coverage residue on a shared outline
AntialiasCoverage	192,4 → 193,4	0.000853	ΔRGB(-2,-18,-18)	antialiasing coverage residue on a shared outline
AntialiasCoverage	192,4 → 192,4	0.000853	ΔRGB(13,81,82)	antialiasing coverage residue on a shared outline
AntialiasCoverage	14,109 → 15,109	0.000853	ΔRGB(-15,-11,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	13,110 → 13,110	0.000853	ΔRGB(-15,-11,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	12,111 → 12,111	0.000853	ΔRGB(-15,-11,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	11,112 → 11,112	0.000853	ΔRGB(-15,-11,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	9,113 → 10,113	0.000853	ΔRGB(-15,-11,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,114 → 8,114	0.000853	ΔRGB(-15,-11,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	7,115 → 7,115	0.000853	ΔRGB(-15,-11,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	5,116 → 6,116	0.000853	ΔRGB(-15,-11,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,116 → 4,116	0.000853	ΔRGB(-15,-11,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	3,117 → 3,117	0.000853	ΔRGB(-15,-11,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	2,118 → 2,118	0.000853	ΔRGB(-15,-11,1)	antialiasing coverage residue on a shared outline
ColorValue	0,119 → 1,119	0.000853	ΔRGB(-15,-11,1)	fill recolour ΔRGB(-15,-11,+1) (ΔE 0)
AntialiasCoverage	16,4 → 16,4	0.000427	ΔRGB(4,24,24)	antialiasing coverage residue on a shared outline
AntialiasCoverage	15,108 → 15,108	0.000427	ΔRGB(-28,-20,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	15,108 → 15,108	0.000427	ΔRGB(-32,-23,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	14,109 → 14,109	0.000427	ΔRGB(-28,-20,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	14,109 → 14,109	0.000427	ΔRGB(-32,-23,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	13,110 → 13,110	0.000427	ΔRGB(-28,-20,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	12,110 → 12,110	0.000427	ΔRGB(-32,-23,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	12,111 → 12,111	0.000427	ΔRGB(-28,-20,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	11,111 → 11,111	0.000427	ΔRGB(-32,-23,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	10,112 → 10,112	0.000427	ΔRGB(-28,-20,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	10,112 → 10,112	0.000427	ΔRGB(-32,-23,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	9,113 → 9,113	0.000427	ΔRGB(-28,-20,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	9,113 → 9,113	0.000427	ΔRGB(-32,-23,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,114 → 8,114	0.000427	ΔRGB(-28,-20,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	7,114 → 7,114	0.000427	ΔRGB(-32,-23,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	6,115 → 6,115	0.000427	ΔRGB(-28,-20,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	6,115 → 6,115	0.000427	ΔRGB(-32,-23,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	5,116 → 5,116	0.000427	ΔRGB(-28,-20,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	5,116 → 5,116	0.000427	ΔRGB(-32,-23,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,117 → 4,117	0.000427	ΔRGB(-28,-20,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,117 → 4,117	0.000427	ΔRGB(-32,-23,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	3,118 → 3,118	0.000427	ΔRGB(-28,-20,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	2,118 → 2,118	0.000427	ΔRGB(-32,-23,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	1,119 → 1,119	0.000427	ΔRGB(-28,-20,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	1,119 → 1,119	0.000427	ΔRGB(-32,-23,2)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/border-per-side-colors.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>border per-side widths and colors</title>
6<style>
7  @page { size: 280px 128px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 200px;
13    height: 120px;
14    background-color: #fafafa;
15    border-top: 4px solid #d50000;
16    border-right: 8px solid #00c853;
17    border-bottom: 12px solid #2962ff;
18    border-left: 16px solid #ff6d00;
19  }
20</style>
21</head>
22<body>
23  <div class="box"></div>
24</body>
25</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.18% · raw 0.19% (745 px) border-rounded-per-side-width-color · rounded-per-side-width-colorPASS via CSS-scale observation: sub-CSS shared-outline coverageExtraextra 0.8%ΔE 5.5

why: visually accepted coverage phase; raw candidate adds paint absent from reference (0.8%)

Unequal side widths and colors share one normalized elliptical border ring with non-overlapping corner ownership.

regions (40 total; showing 40 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
Extra	2	639	0,0 → 180,104	426	total 0.2% · largest 0.2%
ColorErr	38	106	0,1 → 199,115	61	total 0.04% · largest 0.02%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
Extra	44,0 → 180,0	0.2		candidate adds paint absent from reference (0.2%)
Extra	0,36 → 0,104	0.08		candidate adds paint absent from reference (0.08%)
AntialiasCoverage	190,104 → 198,115	0.02	ΔRGB(-4,-4,22)	antialiasing coverage residue on a shared outline
AntialiasCoverage	18,7 → 19,7	0.000766	ΔRGB(3,10,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	20,8 → 20,8	0.000766	ΔRGB(3,10,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	21,9 → 22,9	0.000766	ΔRGB(3,10,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	23,9 → 23,9	0.000766	ΔRGB(3,10,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	25,10 → 25,10	0.000766	ΔRGB(4,9,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	26,11 → 27,11	0.000766	ΔRGB(4,10,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	28,11 → 28,11	0.000766	ΔRGB(4,10,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	29,12 → 30,12	0.000766	ΔRGB(4,10,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	34,1 → 34,1	0.000383	ΔRGB(1,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	199,6 → 199,6	0.000383	ΔRGB(1,5,5)	antialiasing coverage residue on a shared outline
AntialiasCoverage	19,8 → 19,8	0.000383	ΔRGB(2,1,-8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	20,8 → 20,8	0.000383	ΔRGB(0,1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	20,8 → 20,8	0.000383	ΔRGB(2,1,-8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	21,8 → 21,8	0.000383	ΔRGB(0,1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	182,8 → 182,8	0.000383	ΔRGB(-3,-13,-13)	antialiasing coverage residue on a shared outline
AntialiasCoverage	22,9 → 22,9	0.000383	ΔRGB(2,1,-8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	23,9 → 23,9	0.000383	ΔRGB(0,1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	24,10 → 24,10	0.000383	ΔRGB(2,1,-8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	24,10 → 24,10	0.000383	ΔRGB(0,1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	188,10 → 188,10	0.000383	ΔRGB(-5,-18,-18)	antialiasing coverage residue on a shared outline
AntialiasCoverage	25,10 → 25,10	0.000383	ΔRGB(2,1,-8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	26,10 → 26,10	0.000383	ΔRGB(0,1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	27,11 → 27,11	0.000383	ΔRGB(2,1,-8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	28,11 → 28,11	0.000383	ΔRGB(0,1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	189,11 → 189,11	0.000383	ΔRGB(-2,-9,-9)	antialiasing coverage residue on a shared outline
AntialiasCoverage	28,12 → 28,12	0.000383	ΔRGB(2,1,-8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	29,12 → 29,12	0.000383	ΔRGB(0,1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	190,12 → 190,12	0.000383	ΔRGB(-2,-5,-5)	antialiasing coverage residue on a shared outline
AntialiasCoverage	30,12 → 30,12	0.000383	ΔRGB(2,1,-8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	31,12 → 31,12	0.000383	ΔRGB(0,1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	31,12 → 31,12	0.000383	ΔRGB(4,10,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	193,14 → 193,14	0.000383	ΔRGB(-17,-10,-17)	antialiasing coverage residue on a shared outline
AntialiasCoverage	194,15 → 194,15	0.000383	ΔRGB(-18,-11,-17)	antialiasing coverage residue on a shared outline
AntialiasCoverage	194,17 → 194,17	0.000383	ΔRGB(-14,-9,-14)	antialiasing coverage residue on a shared outline
AntialiasCoverage	196,23 → 196,23	0.000383	ΔRGB(-17,-10,-16)	antialiasing coverage residue on a shared outline
AntialiasCoverage	195,97 → 195,97	0.000383	ΔRGB(-9,-5,-8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,104 → 0,104	0.000383	ΔRGB(-1,-3,-4)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/border-rounded-per-side-width-color.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>rounded per-side border geometry</title>
6<style>
7  @page { size: 256px 160px; margin: 0; }
8  html, body { background: #ffffff; }
9  * { margin: 0; padding: 0; box-sizing: border-box; }
10  .box {
11    width: 208px;
12    height: 128px;
13    margin: 16px 24px;
14    background: #f7f7f7;
15    border-top: 8px solid #c62828;
16    border-right: 12px solid #2e7d32;
17    border-bottom: 16px solid #1565c0;
18    border-left: 20px solid #ef6c00;
19    border-radius: 44px 28px / 36px 24px;
20  }
21</style>
22</head>
23<body><div class="box"></div></body>
24</html>

PASS exact match border-collapsed-table-applicability · collapsed-table-image-radius-applicability

Collapsed table cells ignore border-image and border-radius while their ordinary borders remain in collapsed-border conflict resolution; the collapsed table radius also has no effect.

PASS exact match border-solid-width · solid-width

Box with a uniform 8px solid border around a light fill.

PASS exact match border-width-keywords · width-keywords

Per-side border-width keywords thin/medium/thick.

border-color — 100.00% verified visual parity PASS 4 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS visually equivalent · no rejecting defect · thresholded evidence 0.60% · raw 0.63% (2502 px) border-rounded-translucent-sides · rounded-translucent-side-joinsPASS via CSS-scale observation: stable same-coordinate outline phaseAntialiasCoveragemissing 0.005261%extra 0.07%ΔE 14.8

why: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

Translucent unequal border sides retain single-paint diagonal ownership at normalized elliptical corners without alpha-dark overlap.

regions (427 total; showing 64 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	336	2323	24,16 → 232,144	422	total 0.6% · largest 0.1%
Missing	13	13	35,34 → 69,49	1	total 0.003250% · largest 0.000250%
Extra	78	166	37,34 → 218,122	13	total 0.04% · largest 0.003250%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	70,34 → 205,34	0.1	ΔRGB(21,129,129)	antialiasing coverage residue on a shared outline
AntialiasCoverage	76,16 → 204,16	0.1	ΔRGB(4,-13,-16)	antialiasing coverage residue on a shared outline
AntialiasCoverage	34,51 → 34,99	0.04	ΔRGB(0,74,129)	antialiasing coverage residue on a shared outline
AntialiasCoverage	24,52 → 24,96	0.03	ΔRGB(7,-5,-16)	antialiasing coverage residue on a shared outline
AntialiasCoverage	31,113 → 39,128	0.02	ΔRGB(-7,-7,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	213,115 → 222,129	0.02	ΔRGB(-5,-6,7)	antialiasing coverage residue on a shared outline
ColorValue	32,32 → 40,43	0.02	ΔRGB(-1,-8,-8)	fill recolour ΔRGB(-1,-8,-8) (ΔE 0)
Extra	184,122 → 188,122	0.003250		candidate adds paint absent from reference (0.003250%)
AntialiasCoverage	217,21 → 219,23	0.003250	ΔRGB(-1,33,34)	antialiasing coverage residue on a shared outline
AntialiasCoverage	37,136 → 39,138	0.003250	ΔRGB(27,19,-5)	antialiasing coverage residue on a shared outline
ColorValue	69,16 → 72,16	0.003000	ΔRGB(10,-37,-41)	fill recolour ΔRGB(+10,-37,-41) (ΔE 0)
AntialiasCoverage	232,57 → 232,60	0.003000	ΔRGB(122,56,71)	antialiasing coverage residue on a shared outline
ColorValue	24,100 → 24,103	0.003000	ΔRGB(19,-15,-41)	fill recolour ΔRGB(+19,-15,-41) (ΔE 0)
AntialiasCoverage	183,144 → 187,144	0.003000	ΔRGB(60,42,-12)	antialiasing coverage residue on a shared outline
AntialiasCoverage	31,32 → 32,34	0.002500	ΔRGB(25,-8,-21)	antialiasing coverage residue on a shared outline
AntialiasCoverage	224,126 → 225,127	0.002500	ΔRGB(92,39,53)	antialiasing coverage residue on a shared outline
Extra	218,58 → 218,60	0.002250		candidate adds paint absent from reference (0.002250%)
AntialiasCoverage	222,27 → 223,28	0.002250	ΔRGB(-1,-4,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	66,34 → 69,34	0.002250	ΔRGB(16,96,96)	antialiasing coverage residue on a shared outline
AntialiasCoverage	209,36 → 211,37	0.002250	ΔRGB(5,27,27)	antialiasing coverage residue on a shared outline
ColorValue	44,22 → 46,23	0.002000	ΔRGB(10,-37,-41)	fill recolour ΔRGB(+10,-37,-41) (ΔE 0)
AntialiasCoverage	221,29 → 222,30	0.002000	ΔRGB(-1,-10,-10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	34,29 → 36,30	0.002000	ΔRGB(15,-9,-10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	219,32 → 220,33	0.002000	ΔRGB(-1,-10,-10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	216,35 → 217,36	0.002000	ΔRGB(-1,-10,-10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	214,37 → 215,39	0.002000	ΔRGB(-1,-10,-10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	220,130 → 221,131	0.002000	ΔRGB(79,55,-5)	antialiasing coverage residue on a shared outline
AntialiasCoverage	210,137 → 211,137	0.002000	ΔRGB(60,42,-12)	antialiasing coverage residue on a shared outline
Extra	189,121 → 191,121	0.001750		candidate adds paint absent from reference (0.001750%)
ColorValue	66,16 → 68,16	0.001750	ΔRGB(10,-37,-41)	fill recolour ΔRGB(+10,-37,-41) (ΔE 0)
ColorValue	24,48 → 24,50	0.001750	ΔRGB(19,-15,-41)	fill recolour ΔRGB(+19,-15,-41) (ΔE 0)
AntialiasCoverage	231,54 → 231,56	0.001750	ΔRGB(75,33,43)	antialiasing coverage residue on a shared outline
ColorValue	24,104 → 24,106	0.001750	ΔRGB(19,-15,-41)	fill recolour ΔRGB(+19,-15,-41) (ΔE 0)
AntialiasCoverage	232,110 → 232,112	0.001750	ΔRGB(122,56,71)	antialiasing coverage residue on a shared outline
AntialiasCoverage	188,143 → 189,143	0.001750	ΔRGB(60,42,-12)	antialiasing coverage residue on a shared outline
Extra	192,121 → 194,121	0.001500		candidate adds paint absent from reference (0.001500%)
ColorValue	205,16 → 207,16	0.001500	ΔRGB(10,-19,-21)	fill recolour ΔRGB(+10,-19,-21) (ΔE 0)
AntialiasCoverage	215,20 → 216,20	0.001500	ΔRGB(1,12,12)	antialiasing coverage residue on a shared outline
ColorValue	48,21 → 50,21	0.001500	ΔRGB(11,-24,-27)	fill recolour ΔRGB(+11,-24,-27) (ΔE 0)
AntialiasCoverage	220,24 → 220,25	0.001500	ΔRGB(1,12,12)	antialiasing coverage residue on a shared outline
AntialiasCoverage	220,30 → 220,31	0.001500	ΔRGB(-2,-8,-8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	218,33 → 218,34	0.001500	ΔRGB(-2,-8,-8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	226,34 → 226,35	0.001500	ΔRGB(22,11,13)	antialiasing coverage residue on a shared outline
AntialiasCoverage	64,35 → 65,35	0.001500	ΔRGB(16,96,96)	antialiasing coverage residue on a shared outline
AntialiasCoverage	215,36 → 216,37	0.001500	ΔRGB(-2,-8,-8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	213,39 → 214,40	0.001500	ΔRGB(-2,-8,-8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	26,41 → 26,42	0.001500	ΔRGB(19,-12,-35)	antialiasing coverage residue on a shared outline
AntialiasCoverage	37,44 → 38,44	0.001500	ΔRGB(0,70,122)	antialiasing coverage residue on a shared outline
AntialiasCoverage	34,100 → 34,102	0.001500	ΔRGB(0,55,96)	antialiasing coverage residue on a shared outline
AntialiasCoverage	229,118 → 230,119	0.001500	ΔRGB(80,35,46)	antialiasing coverage residue on a shared outline
AntialiasCoverage	29,124 → 30,126	0.001500	ΔRGB(1,-1,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	35,134 → 36,135	0.001500	ΔRGB(10,7,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	206,139 → 207,139	0.001500	ΔRGB(69,48,-11)	antialiasing coverage residue on a shared outline
AntialiasCoverage	40,139 → 41,140	0.001500	ΔRGB(10,7,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	49,144 → 50,144	0.001500	ΔRGB(48,34,-6)	antialiasing coverage residue on a shared outline
Extra	217,55 → 217,57	0.001250		candidate adds paint absent from reference (0.001250%)
Extra	194,121 → 196,121	0.001250		candidate adds paint absent from reference (0.001250%)
ColorValue	64,17 → 65,17	0.001250	ΔRGB(10,-37,-41)	fill recolour ΔRGB(+10,-37,-41) (ΔE 0)
ColorValue	62,17 → 63,17	0.001250	ΔRGB(10,-37,-41)	fill recolour ΔRGB(+10,-37,-41) (ΔE 0)
ColorValue	60,17 → 62,17	0.001250	ΔRGB(10,-37,-41)	fill recolour ΔRGB(+10,-37,-41) (ΔE 0)
AntialiasCoverage	206,35 → 207,35	0.001250	ΔRGB(2,14,14)	antialiasing coverage residue on a shared outline
AntialiasCoverage	61,35 → 63,35	0.001250	ΔRGB(16,96,96)	antialiasing coverage residue on a shared outline
AntialiasCoverage	60,35 → 61,35	0.001250	ΔRGB(16,96,96)	antialiasing coverage residue on a shared outline
AntialiasCoverage	231,50 → 231,51	0.001250	ΔRGB(75,33,43)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/border-rounded-translucent-sides.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>rounded translucent border side joins</title>
6<style>
7  @page { size: 256px 160px; margin: 0; }
8  html, body { background: #d7dee8; }
9  * { margin: 0; padding: 0; box-sizing: border-box; }
10  .box {
11    width: 208px;
12    height: 128px;
13    margin: 16px 24px;
14    background: #ffffff;
15    border-width: 18px 14px 22px 10px;
16    border-style: solid;
17    border-color: rgba(213, 0, 0, .58) rgba(0, 121, 107, .58)
18                  rgba(41, 98, 255, .58) rgba(255, 109, 0, .58);
19    border-radius: 52px 28px / 36px 48px;
20  }
21</style>
22</head>
23<body><div class="box"></div></body>
24</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.41% · raw 0.42% (1146 px) border-color-four-value-shorthand · four-value-shorthandPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 14.0

why: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

border-color four-value shorthand assigns a distinct color to each side; catches single-color shorthand parsing.

regions (110 total; showing 64 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	110	1146	0,0 → 130,90	555	total 1.0% · largest 0.5%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	0,78 → 130,90	0.5	ΔRGB(-65,-33,-64)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,0 → 130,12	0.4	ΔRGB(-9,-69,-70)	antialiasing coverage residue on a shared outline
AntialiasCoverage	1,1 → 1,1	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
ColorValue	129,1 → 129,1	0.000871	ΔRGB(-3,-26,-27)	fill recolour ΔRGB(-3,-26,-27) (ΔE 0)
AntialiasCoverage	1,1 → 1,1	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
ColorValue	129,1 → 129,1	0.000871	ΔRGB(-3,-26,-27)	fill recolour ΔRGB(-3,-26,-27) (ΔE 0)
AntialiasCoverage	1,1 → 1,1	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	129,1 → 129,1	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	2,2 → 2,2	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	128,2 → 128,2	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	2,2 → 2,2	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	128,2 → 128,2	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	2,2 → 2,2	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	128,2 → 128,2	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	3,3 → 3,3	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	127,3 → 127,3	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	3,3 → 3,3	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	127,3 → 127,3	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	3,3 → 3,3	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	127,3 → 127,3	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,4 → 4,4	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	126,4 → 126,4	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,4 → 4,4	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	126,4 → 126,4	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,4 → 4,4	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	126,4 → 126,4	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,4 → 4,4	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	125,4 → 125,4	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	5,5 → 5,5	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	125,5 → 125,5	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	5,5 → 5,5	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	125,5 → 125,5	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	5,5 → 5,5	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	124,5 → 124,5	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	6,6 → 6,6	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	124,6 → 124,6	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	6,6 → 6,6	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	124,6 → 124,6	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	6,6 → 6,6	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	124,6 → 124,6	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	7,7 → 7,7	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	123,7 → 123,7	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	7,7 → 7,7	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	123,7 → 123,7	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	7,7 → 7,7	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	123,7 → 123,7	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,8 → 8,8	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	122,8 → 122,8	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,8 → 8,8	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	122,8 → 122,8	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,8 → 8,8	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	122,8 → 122,8	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	9,9 → 9,9	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	121,9 → 121,9	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	9,9 → 9,9	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	121,9 → 121,9	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	9,9 → 9,9	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	121,9 → 121,9	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	10,10 → 10,10	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	120,10 → 120,10	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	10,10 → 10,10	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	120,10 → 120,10	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	10,10 → 10,10	0.000871	ΔRGB(-4,-27,-27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	120,10 → 120,10	0.000871	ΔRGB(-3,-26,-27)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/border-color-four-value-shorthand.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>border color four value shorthand</title>
6<style>
7  @page { size: 192px 144px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 130px;
13    height: 90px;
14    margin: 20px;
15    border-style: solid;
16    border-width: 12px;
17    border-color: #e53935 #1e88e5 #43a047 #fdd835;
18    background: #ffffff;
19  }
20</style>
21</head>
22<body>
23  <div class="box"></div>
24</body>
25</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.02% · raw 0.02% (76 px) border-color-transparent · transparent-sidePASS via raw same-coordinate visibility policyAntialiasCoverageΔE 7.3

why: antialiasing coverage residue on a shared outline

border-color transparent on one side, solid on the rest.

regions (76 total; showing 64 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	76	76	0,108 → 200,120	1	total 0.03% · largest 0.000427%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	12,108 → 12,108	0.000427	ΔRGB(-32,-18,-20)	antialiasing coverage residue on a shared outline
AntialiasCoverage	188,108 → 188,108	0.000427	ΔRGB(-39,-22,-25)	antialiasing coverage residue on a shared outline
ColorValue	12,108 → 12,108	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	188,108 → 188,108	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	11,108 → 11,108	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	188,108 → 188,108	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	11,109 → 11,109	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	189,109 → 189,109	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	11,109 → 11,109	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	189,109 → 189,109	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	10,109 → 10,109	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	189,109 → 189,109	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	10,110 → 10,110	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	190,110 → 190,110	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	10,110 → 10,110	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	190,110 → 190,110	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	9,110 → 9,110	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	190,110 → 190,110	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	9,111 → 9,111	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	191,111 → 191,111	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	9,111 → 9,111	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	191,111 → 191,111	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	8,111 → 8,111	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	191,111 → 191,111	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	8,112 → 8,112	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	192,112 → 192,112	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	8,112 → 8,112	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	192,112 → 192,112	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	7,112 → 7,112	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	192,112 → 192,112	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	7,113 → 7,113	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	193,113 → 193,113	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	7,113 → 7,113	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	193,113 → 193,113	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	6,113 → 6,113	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	193,113 → 193,113	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	6,114 → 6,114	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	194,114 → 194,114	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	6,114 → 6,114	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	194,114 → 194,114	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	5,114 → 5,114	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	194,114 → 194,114	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	5,115 → 5,115	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	195,115 → 195,115	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	5,115 → 5,115	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	195,115 → 195,115	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	4,115 → 4,115	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	195,115 → 195,115	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	4,116 → 4,116	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	196,116 → 196,116	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	4,116 → 4,116	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	196,116 → 196,116	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	4,116 → 4,116	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	196,116 → 196,116	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	3,116 → 3,116	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	196,116 → 196,116	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	3,117 → 3,117	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	197,117 → 197,117	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	3,117 → 3,117	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	197,117 → 197,117	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	2,117 → 2,117	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	197,117 → 197,117	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	2,118 → 2,118	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)
ColorValue	198,118 → 198,118	0.000427	ΔRGB(-34,-20,-21)	fill recolour ΔRGB(-34,-20,-21) (ΔE 0)

source · cases/backgrounds-borders/border-color-transparent.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>border-color transparent top, solid others</title>
6<style>
7  @page { size: 280px 128px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 200px;
13    height: 120px;
14    background-color: #ffffff;
15    border: 12px solid #00695c;
16    border-top-color: transparent;
17  }
18</style>
19</head>
20<body>
21  <div class="box"></div>
22</body>
23</html>

PASS exact match border-color-currentcolor · currentcolor

border-color currentColor resolves to the element color.

border-image — 100.00% verified visual parity PASS 12 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS visually equivalent · no rejecting defect · thresholded evidence 0.12% · raw 10.20% (101987 px) border-image-background-nested-inline · background-coexistence-nested-replacedPASS via raw same-coordinate visibility policyColorValueΔE 0.4

why: fill colour differs (ΔE 0.4)

A border image remains independent from a background gradient and replaces the red fallback border on block, nested-block, and replaced raster-image paths. Catches computed-style source collisions and child paint paths that bypass the shared border decoration pipeline.

regions (219 total; showing 64 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	219	101987	0,0 → 280,193	33038	total 18.1% · largest 5.9% · max ΔE 0.8

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
ColorValue	8,0 → 280,26	5.9	ΔE 0.3	fill colour differs (ΔE 0.3)
ColorValue	164,32 → 280,50	3.1	ΔE 0.4	fill colour differs (ΔE 0.4)
ColorValue	8,53 → 280,55	1.1	ΔE 0.4 ΔRGB(1,0,0)	fill recolour ΔRGB(+1,+0,+0) (ΔE 0.4)
ColorValue	8,56 → 280,58	1.1	ΔE 0.4 ΔRGB(-1,0,0)	fill recolour ΔRGB(-1,+0,+0) (ΔE 0.4)
ColorValue	8,61 → 280,63	1.1	ΔE 0.3	fill colour differs (ΔE 0.3)
ColorValue	8,58 → 280,60	1.0	ΔE 0.4 ΔRGB(-1,0,1)	fill recolour ΔRGB(-1,+0,+1) (ΔE 0.4)
ColorValue	164,50 → 280,52	0.5	ΔE 0.4	fill colour differs (ΔE 0.4)
ColorValue	164,26 → 280,28	0.5	ΔE 0.3	fill colour differs (ΔE 0.3)
ColorValue	19,95 → 32,129	0.4	ΔE 0.5	fill colour differs (ΔE 0.5)
ColorValue	164,29 → 280,31	0.4	ΔE 0.3	fill colour differs (ΔE 0.3)
ColorValue	8,32 → 20,50	0.3	ΔE 0.4	fill colour differs (ΔE 0.4)
ColorValue	37,95 → 48,129	0.3	ΔE 0.5	fill colour differs (ΔE 0.5)
ColorValue	51,95 → 57,129	0.3	ΔE 0.5	fill colour differs (ΔE 0.5)
ColorValue	77,95 → 83,129	0.2	ΔE 0.5	fill colour differs (ΔE 0.5)
AntialiasCoverage	8,63 → 280,72	0.2	ΔE 0.07 ΔRGB(0,0,1)	antialiasing coverage residue on a shared outline
ColorValue	64,95 → 69,129	0.2	ΔE 0.5	fill colour differs (ΔE 0.5)
ColorValue	13,95 → 19,129	0.2	ΔE 0.5	fill colour differs (ΔE 0.5)
ColorValue	69,95 → 73,129	0.1	ΔE 0.5	fill colour differs (ΔE 0.5)
ColorValue	7,95 → 11,129	0.1	ΔE 0.5 ΔRGB(1,1,1)	fill recolour ΔRGB(+1,+1,+1) (ΔE 0.5)
ColorValue	85,95 → 89,129	0.1	ΔE 0.2 ΔRGB(-1,-1,-1)	fill recolour ΔRGB(-1,-1,-1) (ΔE 0.2)
AntialiasCoverage	7,159 → 57,193	0.09	ΔRGB(42,-12,68)	antialiasing coverage residue on a shared outline
ColorValue	83,95 → 85,129	0.07	ΔE 0.5	fill colour differs (ΔE 0.5)
ColorValue	35,95 → 37,129	0.07	ΔE 0.5	fill colour differs (ΔE 0.5)
AntialiasCoverage	63,95 → 64,129	0.06	ΔE 0.2 ΔRGB(0,0,1)	antialiasing coverage residue on a shared outline
ColorValue	8,50 → 21,52	0.05	ΔE 0.4	fill colour differs (ΔE 0.4)
ColorValue	8,26 → 20,28	0.05	ΔE 0.3 ΔRGB(0,0,1)	fill recolour ΔRGB(+0,+0,+1) (ΔE 0.3)
AntialiasCoverage	32,95 → 33,129	0.05	ΔE 0.2 ΔRGB(0,-1,-1)	antialiasing coverage residue on a shared outline
ColorValue	8,29 → 20,31	0.04	ΔE 0.3	fill colour differs (ΔE 0.3)
ColorValue	48,104 → 51,115	0.03	ΔE 0.8	fill colour differs (ΔE 0.8)
ColorValue	48,115 → 51,125	0.03	ΔE 0.8	fill colour differs (ΔE 0.8)
ColorValue	72,101 → 77,109	0.02	ΔE 0.8	fill colour differs (ΔE 0.8)
ColorValue	72,117 → 77,125	0.02	ΔE 0.8	fill colour differs (ΔE 0.8)
ColorValue	72,107 → 77,115	0.02	ΔE 0.8	fill colour differs (ΔE 0.8)
ColorValue	72,96 → 77,104	0.02	ΔE 0.8	fill colour differs (ΔE 0.8)
ColorValue	72,112 → 77,120	0.02	ΔE 0.8	fill colour differs (ΔE 0.8)
ColorValue	48,95 → 51,104	0.02	ΔE 0.8	fill colour differs (ΔE 0.8)
ColorValue	11,119 → 13,128	0.02	ΔE 0.5 ΔRGB(0,0,1)	fill recolour ΔRGB(+0,+0,+1) (ΔE 0.5)
ColorValue	11,98 → 13,107	0.02	ΔE 0.5 ΔRGB(0,0,1)	fill recolour ΔRGB(+0,+0,+1) (ΔE 0.5)
ColorValue	11,108 → 13,117	0.02	ΔE 0.5 ΔRGB(0,0,1)	fill recolour ΔRGB(+0,+0,+1) (ΔE 0.5)
ColorValue	72,123 → 77,129	0.02	ΔE 0.8	fill colour differs (ΔE 0.8)
ColorValue	45,117 → 48,123	0.01	ΔE 0.8	fill colour differs (ΔE 0.8)
ColorValue	45,107 → 48,112	0.01	ΔE 0.8	fill colour differs (ΔE 0.8)
ColorValue	45,96 → 48,101	0.01	ΔE 0.8	fill colour differs (ΔE 0.8)
ColorValue	48,125 → 51,129	0.01	ΔE 0.8	fill colour differs (ΔE 0.8)
ColorValue	75,95 → 77,99	0.01	ΔE 0.8 ΔRGB(-1,0,-1)	fill recolour ΔRGB(-1,+0,-1) (ΔE 0.8)
ColorValue	13,96 → 15,99	0.008510	ΔE 0.5	fill colour differs (ΔE 0.5)
ColorValue	13,123 → 15,125	0.007801	ΔE 0.5	fill colour differs (ΔE 0.5)
ColorValue	30,127 → 32,128	0.007092	ΔE 0.5 ΔRGB(0,0,1)	fill recolour ΔRGB(+0,+0,+1) (ΔE 0.5)
ColorValue	30,106 → 32,107	0.005673	ΔE 0.5 ΔRGB(0,0,1)	fill recolour ΔRGB(+0,+0,+1) (ΔE 0.5)
ColorValue	30,116 → 32,117	0.005673	ΔE 0.5 ΔRGB(0,0,1)	fill recolour ΔRGB(+0,+0,+1) (ΔE 0.5)
ColorValue	19,103 → 20,104	0.004432	ΔE 0.8 ΔRGB(0,-1,0)	fill recolour ΔRGB(+0,-1,+0) (ΔE 0.8)
ColorValue	19,127 → 20,128	0.004432	ΔE 0.8 ΔRGB(0,-1,0)	fill recolour ΔRGB(+0,-1,+0) (ΔE 0.8)
ColorValue	46,127 → 48,128	0.004432	ΔE 0.8 ΔRGB(1,0,1)	fill recolour ΔRGB(+1,+0,+1) (ΔE 0.8)
AntialiasCoverage	30,95 → 32,96	0.004255	ΔE 0.5 ΔRGB(0,0,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,95 → 7,95	0.003901	ΔE 0.3 ΔRGB(0,2,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	89,95 → 96,95	0.003901	ΔE 0.3 ΔRGB(0,2,1)	antialiasing coverage residue on a shared outline
ColorValue	19,106 → 20,107	0.003546	ΔE 0.8 ΔRGB(0,-1,0)	fill recolour ΔRGB(+0,-1,+0) (ΔE 0.8)
ColorValue	46,106 → 48,107	0.003546	ΔE 0.8 ΔRGB(1,0,1)	fill recolour ΔRGB(+1,+0,+1) (ΔE 0.8)
ColorValue	19,114 → 20,115	0.003546	ΔE 0.8 ΔRGB(0,-1,0)	fill recolour ΔRGB(+0,-1,+0) (ΔE 0.8)
ColorValue	19,116 → 20,117	0.003546	ΔE 0.8 ΔRGB(0,-1,0)	fill recolour ΔRGB(+0,-1,+0) (ΔE 0.8)
ColorValue	46,116 → 48,117	0.003546	ΔE 0.8 ΔRGB(1,0,1)	fill recolour ΔRGB(+1,+0,+1) (ΔE 0.8)
ColorValue	19,124 → 20,125	0.003546	ΔE 0.8 ΔRGB(0,-1,0)	fill recolour ΔRGB(+0,-1,+0) (ΔE 0.8)
AntialiasCoverage	156,51 → 160,52	0.003014	ΔE 0.3 ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
ColorValue	60,104 → 61,105	0.002837	ΔE 0.5 ΔRGB(-1,0,0)	fill recolour ΔRGB(-1,+0,+0) (ΔE 0.5)

source · cases/backgrounds-borders/border-image-background-nested-inline.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>border image background nested and replaced elements</title>
6<style>
7  @page { size: 320px 320px; margin: 0; }
8  html, body { background: #fff; }
9  * { box-sizing: border-box; margin: 0; padding: 0; }
10  body { padding: 16px; }
11  .outer {
12    width: 288px;
13    height: 72px;
14    padding: 12px;
15    background: linear-gradient(to bottom, #fff3b0, #90e0ef);
16    border: 8px solid #d00000;
17    border-image: linear-gradient(to right, #7209b7, #f72585, #4cc9f0) 1;
18  }
19  .inner {
20    width: 144px;
21    height: 32px;
22    background: #f8f9fa;
23    border: 6px solid #ff0000;
24    border-image: linear-gradient(135deg, #2a9d8f, #ffbe0b) 1;
25  }
26  .item {
27    width: 96px;
28    height: 48px;
29    margin-top: 16px;
30    background: linear-gradient(to right, #e9ecef, #ced4da);
31    border: 7px solid #ff0000;
32    border-image: linear-gradient(to bottom, #3a0ca3, #4cc9f0) 1;
33  }
34  img {
35    display: block;
36    width: 64px;
37    height: 48px;
38    margin-top: 16px;
39    background: #f1faee;
40    border: 7px solid #ff0000;
41    border-image: linear-gradient(to right, #e63946, #457b9d) 1;
42  }
43</style>
44</head>
45<body>
46  <div class="outer"><div class="inner"></div></div>
47  <div class="item"></div>
48  <img alt="" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAECAIAAAA8r+mnAAAAIElEQVR42mM4IScHR3I9NnDEgFNCzu0EHN1ZJQJHOCUAni4lgeO2HLIAAAAASUVORK5CYII=">
49</body>
50</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.90% · raw 3.07% (24173 px) border-image-fill-axis-repeat · center-fill-independent-axis-repeatPASS via CSS-scale observation: sub-CSS shared-outline coverageColorValuemissing 0.001208%extra 0.001208%ΔE 0.7

why: visually accepted coverage phase; raw fill colour differs (ΔE 0.7)

The preserved center slice paints above the background while horizontal and vertical border-image-repeat modes independently apply round, repeat, stretch, and space tiling.

regions (15 total; showing 15 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	5	24163	0,0 → 312,189	15465	total 4.2% · largest 2.7% · max ΔE 1.3
Extra	5	5	208,17 → 208,121	1	total 0.000865% · largest 0.000173%
Missing	5	5	208,33 → 208,137	1	total 0.000865% · largest 0.000173%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
ColorValue	208,69 → 312,189	2.7	ΔE 0.4	fill colour differs (ΔE 0.4)
ColorValue	208,0 → 312,69	1.3	ΔE 1.3 ΔRGB(0,-1,-1)	fill recolour ΔRGB(+0,-1,-1) (ΔE 1.3)
AntialiasCoverage	0,8 → 176,136	0.2	ΔRGB(22,1,-16)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,120 → 0,136	0.008827	ΔRGB(115,184,55)	antialiasing coverage residue on a shared outline
Missing	208,33 → 208,33	0.000173		candidate lacks paint present in reference (0.000173%)
Missing	208,51 → 208,51	0.000173		candidate lacks paint present in reference (0.000173%)
Missing	208,68 → 208,68	0.000173		candidate lacks paint present in reference (0.000173%)
Missing	208,120 → 208,120	0.000173		candidate lacks paint present in reference (0.000173%)
Missing	208,137 → 208,137	0.000173		candidate lacks paint present in reference (0.000173%)
Extra	208,17 → 208,17	0.000173		candidate adds paint absent from reference (0.000173%)
Extra	208,35 → 208,35	0.000173		candidate adds paint absent from reference (0.000173%)
Extra	208,52 → 208,52	0.000173		candidate adds paint absent from reference (0.000173%)
Extra	208,104 → 208,104	0.000173		candidate adds paint absent from reference (0.000173%)
Extra	208,121 → 208,121	0.000173		candidate adds paint absent from reference (0.000173%)
AntialiasCoverage	16,120 → 16,120	0.000173	ΔRGB(4,-7,-2)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/border-image-fill-axis-repeat.html

1<!doctype html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>border-image fill and independent axis repeats</title>
6<style>
7  @page { size: 360px 224px; margin: 0; }
8  html, body { width: 360px; height: 224px; margin: 0; padding: 0; background: #fff; }
9  * { box-sizing: border-box; margin: 0; padding: 0; }
10  .box {
11    position: absolute;
12    border: 16px solid #d00000;
13    background: #edf2f4;
14    border-image-source: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAB4AAAAeBAMAAADJHrORAAAAIGNIUk0AAHomAACAhAAA+gAAAIDoAAB1MAAA6mAAADqYAAAXcJy6UTwAAAAeUExUReY5Rv++C0V7nSqdj8202/SiYXssvwbWoCZGU////zsroH4AAAABYktHRAnx2aXsAAAAB3RJTUUH6gcWAwgai6SLPAAAAChJREFUGNNjYAABQRBQAgGGwcY3BgEXEAgFgUHHTwOBchDoAIHBxgcAV5p3ifEnFCkAAAAASUVORK5CYII=");
15    border-image-slice: 10 fill;
16    border-image-width: 16px;
17  }
18  .round-repeat {
19    left: 16px;
20    top: 24px;
21    width: 176px;
22    height: 128px;
23    border-image-repeat: round repeat;
24  }
25  .stretch-space {
26    left: 224px;
27    top: 16px;
28    width: 104px;
29    height: 188.8px;
30    border-image-repeat: stretch space;
31  }
32</style>
33</head>
34<body>
35  <div class="box round-repeat"></div>
36  <div class="box stretch-space"></div>
37</body>
38</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.92% · raw 0.92% (2580 px) border-image-space-horizontal · space-horizontal-stretch-verticalPASS via CSS-scale observation: stable same-coordinate outline phaseExtramissing 0.005166%extra 0.2%ΔE 24.7

why: visually accepted coverage phase; raw candidate adds paint absent from reference (0.2%)

border-image-repeat: space stretch keeps five whole proportional top and bottom edge tiles and equalizes the surplus before, between, and after them, while side slices remain stretched. Catches background-repeat-style edge-flush spacing or partial edge tiles.

regions (60 total; showing 60 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
Extra	4	279	0,0 → 192,72	251	total 0.2% · largest 0.2%
ColorErr	51	2294	8,0 → 184,72	225	total 1.7% · largest 0.2%
Missing	5	7	43,0 → 149,0	2	total 0.005154% · largest 0.001472%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
Extra	0,0 → 8,72	0.2		candidate adds paint absent from reference (0.2%)
AntialiasCoverage	184,0 → 184,72	0.2	ΔRGB(-25,-12,-12)	antialiasing coverage residue on a shared outline
AntialiasCoverage	15,0 → 15,8	0.06	ΔRGB(25,133,-59)	antialiasing coverage residue on a shared outline
AntialiasCoverage	39,0 → 39,8	0.06	ΔRGB(-27,34,-14)	antialiasing coverage residue on a shared outline
AntialiasCoverage	119,0 → 119,8	0.06	ΔRGB(25,133,-59)	antialiasing coverage residue on a shared outline
AntialiasCoverage	143,0 → 143,8	0.06	ΔRGB(-27,34,-14)	antialiasing coverage residue on a shared outline
AntialiasCoverage	15,64 → 15,72	0.06	ΔRGB(25,133,-59)	antialiasing coverage residue on a shared outline
AntialiasCoverage	39,64 → 39,72	0.06	ΔRGB(-27,34,-14)	antialiasing coverage residue on a shared outline
AntialiasCoverage	119,64 → 119,72	0.06	ΔRGB(25,133,-59)	antialiasing coverage residue on a shared outline
AntialiasCoverage	143,64 → 143,72	0.06	ΔRGB(-27,34,-14)	antialiasing coverage residue on a shared outline
AntialiasCoverage	27,0 → 27,8	0.04	ΔRGB(-162,-58,146)	antialiasing coverage residue on a shared outline
AntialiasCoverage	84,0 → 84,8	0.04	ΔRGB(25,133,-8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	131,0 → 131,8	0.04	ΔRGB(-162,-58,146)	antialiasing coverage residue on a shared outline
AntialiasCoverage	11,64 → 11,72	0.04	ΔRGB(-3,-67,-58)	antialiasing coverage residue on a shared outline
AntialiasCoverage	27,64 → 27,72	0.04	ΔRGB(-162,-58,146)	antialiasing coverage residue on a shared outline
AntialiasCoverage	43,64 → 43,72	0.04	ΔRGB(199,93,95)	antialiasing coverage residue on a shared outline
AntialiasCoverage	84,64 → 84,72	0.04	ΔRGB(25,133,-8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	115,64 → 115,72	0.04	ΔRGB(-3,-67,-58)	antialiasing coverage residue on a shared outline
AntialiasCoverage	131,64 → 131,72	0.04	ΔRGB(-162,-58,146)	antialiasing coverage residue on a shared outline
AntialiasCoverage	147,64 → 147,72	0.04	ΔRGB(199,93,95)	antialiasing coverage residue on a shared outline
AntialiasCoverage	11,0 → 11,8	0.04	ΔRGB(-8,-69,-64)	antialiasing coverage residue on a shared outline
AntialiasCoverage	115,0 → 115,8	0.04	ΔRGB(-8,-69,-64)	antialiasing coverage residue on a shared outline
AntialiasCoverage	43,0 → 43,8	0.04	ΔRGB(199,93,95)	antialiasing coverage residue on a shared outline
AntialiasCoverage	147,0 → 147,8	0.04	ΔRGB(199,93,95)	antialiasing coverage residue on a shared outline
Extra	184,0 → 192,0	0.02		candidate adds paint absent from reference (0.02%)
AntialiasCoverage	49,0 → 49,8	0.02	ΔRGB(-6,-33,15)	antialiasing coverage residue on a shared outline
AntialiasCoverage	61,0 → 61,8	0.02	ΔRGB(-24,-9,19)	antialiasing coverage residue on a shared outline
AntialiasCoverage	73,0 → 73,8	0.02	ΔRGB(14,-17,7)	antialiasing coverage residue on a shared outline
AntialiasCoverage	77,0 → 77,8	0.02	ΔRGB(-69,-32,-33)	antialiasing coverage residue on a shared outline
AntialiasCoverage	96,0 → 96,8	0.02	ΔRGB(-93,-34,73)	antialiasing coverage residue on a shared outline
AntialiasCoverage	108,0 → 108,8	0.02	ΔRGB(-23,30,-12)	antialiasing coverage residue on a shared outline
AntialiasCoverage	153,0 → 153,8	0.02	ΔRGB(-6,-33,15)	antialiasing coverage residue on a shared outline
AntialiasCoverage	165,0 → 165,8	0.02	ΔRGB(-24,-9,19)	antialiasing coverage residue on a shared outline
AntialiasCoverage	177,0 → 177,8	0.02	ΔRGB(14,-17,7)	antialiasing coverage residue on a shared outline
AntialiasCoverage	181,0 → 181,8	0.02	ΔRGB(-69,-32,-33)	antialiasing coverage residue on a shared outline
AntialiasCoverage	45,64 → 45,72	0.02	ΔRGB(4,69,60)	antialiasing coverage residue on a shared outline
AntialiasCoverage	49,64 → 49,72	0.02	ΔRGB(-6,-33,15)	antialiasing coverage residue on a shared outline
AntialiasCoverage	61,64 → 61,72	0.02	ΔRGB(-24,-9,19)	antialiasing coverage residue on a shared outline
AntialiasCoverage	73,64 → 73,72	0.02	ΔRGB(14,-17,7)	antialiasing coverage residue on a shared outline
AntialiasCoverage	77,64 → 77,72	0.02	ΔRGB(-69,-32,-33)	antialiasing coverage residue on a shared outline
AntialiasCoverage	80,64 → 80,72	0.02	ΔRGB(2,25,22)	antialiasing coverage residue on a shared outline
AntialiasCoverage	96,64 → 96,72	0.02	ΔRGB(-93,-34,73)	antialiasing coverage residue on a shared outline
AntialiasCoverage	108,64 → 108,72	0.02	ΔRGB(-23,30,-12)	antialiasing coverage residue on a shared outline
AntialiasCoverage	149,64 → 149,72	0.02	ΔRGB(4,69,60)	antialiasing coverage residue on a shared outline
AntialiasCoverage	153,64 → 153,72	0.02	ΔRGB(-6,-33,15)	antialiasing coverage residue on a shared outline
AntialiasCoverage	165,64 → 165,72	0.02	ΔRGB(-24,-9,19)	antialiasing coverage residue on a shared outline
AntialiasCoverage	177,64 → 177,72	0.02	ΔRGB(14,-17,7)	antialiasing coverage residue on a shared outline
AntialiasCoverage	181,64 → 181,72	0.02	ΔRGB(-69,-32,-33)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,0 → 8,8	0.02	ΔRGB(-24,12,9)	antialiasing coverage residue on a shared outline
AntialiasCoverage	45,0 → 45,8	0.02	ΔRGB(4,69,60)	antialiasing coverage residue on a shared outline
AntialiasCoverage	80,0 → 80,8	0.02	ΔRGB(2,25,22)	antialiasing coverage residue on a shared outline
AntialiasCoverage	149,0 → 149,8	0.02	ΔRGB(4,69,60)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,64 → 8,72	0.02	ΔRGB(-24,12,9)	antialiasing coverage residue on a shared outline
Missing	43,0 → 43,0	0.001472		candidate lacks paint present in reference (0.001472%)
Missing	147,0 → 147,0	0.001472		candidate lacks paint present in reference (0.001472%)
Missing	45,0 → 45,0	0.000736		candidate lacks paint present in reference (0.000736%)
Missing	80,0 → 80,0	0.000736		candidate lacks paint present in reference (0.000736%)
Missing	149,0 → 149,0	0.000736		candidate lacks paint present in reference (0.000736%)
Extra	11,0 → 11,0	0.000736		candidate adds paint absent from reference (0.000736%)
Extra	115,0 → 115,0	0.000736		candidate adds paint absent from reference (0.000736%)

source · cases/backgrounds-borders/border-image-space-horizontal.html

1<!doctype html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>border-image horizontal space</title>
6<style>
7@page{size:240px 120px;margin:0}
8html{font-family:ParitySans;line-height:1.5}
9*{margin:0;box-sizing:border-box}
10html,body{background:#fff}
11body{padding:24px}
12.box{
13  width:192px;
14  height:72px;
15  border:8px solid transparent;
16  background:#f1faee;
17  border-image:linear-gradient(to right,#e63946 0 25%,#ffbe0b 25% 50%,#457b9d 50% 75%,#2a9d8f 75% 100%) 32 / 1 / 0 space stretch;
18}
19</style>
20</head>
21<body><div class="box"></div></body>
22</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.57% · raw 0.58% (4387 px) border-image-source-families · raster-svg-radial-conic-order-independent-shorthandPASS via raw same-coordinate visibility policyColorValueΔE 1.7

why: fill recolour ΔRGB(+7,+2,+27) (ΔE 1.7)

Four border images use a raster data URL, SVG data URL, radial gradient, and conic gradient. The conic source appears after the slice and width components, exercising the order-independent shorthand grammar. Every source replaces the magenta fallback border and passes through the same nine-slice painter.

regions (22 total; showing 22 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	22	4387	0,0 → 252,208	1037	total 0.8% · largest 0.2% · max ΔE 1.7

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
ColorValue	6,120 → 25,196	0.2	ΔRGB(-21,-14,41)	fill recolour ΔRGB(-21,-14,+41) (ΔE 0)
ColorValue	96,120 → 114,196	0.1	ΔE 1.7 ΔRGB(25,6,-47)	fill recolour ΔRGB(+25,+6,-47) (ΔE 1.7)
ColorValue	48,120 → 73,132	0.09	ΔE 1.7 ΔRGB(-22,-5,43)	fill recolour ΔRGB(-22,-5,+43) (ΔE 1.7)
ColorValue	49,197 → 71,208	0.06	ΔE 1.7 ΔRGB(12,3,-22)	fill recolour ΔRGB(+12,+3,-22) (ΔE 1.7)
AntialiasCoverage	0,0 → 0,88	0.05	ΔRGB(171,171,171)	antialiasing coverage residue on a shared outline
AntialiasCoverage	12,0 → 12,88	0.05	ΔRGB(30,111,31)	antialiasing coverage residue on a shared outline
AntialiasCoverage	108,0 → 108,88	0.05	ΔRGB(16,25,64)	antialiasing coverage residue on a shared outline
AntialiasCoverage	98,132 → 108,196	0.04	ΔRGB(4,-54,-83)	antialiasing coverage residue on a shared outline
ColorValue	0,132 → 0,196	0.04	ΔRGB(-15,-3,29)	fill recolour ΔRGB(-15,-3,+29) (ΔE 0)
ColorValue	97,197 → 109,208	0.04	ΔE 1.7 ΔRGB(30,8,-57)	fill recolour ΔRGB(+30,+8,-57) (ΔE 1.7)
ColorValue	12,197 → 23,208	0.03	ΔRGB(2,0,-2)	fill recolour ΔRGB(+2,+0,-2) (ΔE 0)
AntialiasCoverage	204,0 → 204,12	0.007067	ΔRGB(-161,66,87)	antialiasing coverage residue on a shared outline
AntialiasCoverage	204,76 → 204,88	0.007067	ΔRGB(213,33,-132)	antialiasing coverage residue on a shared outline
ColorValue	151,132 → 156,132	0.003161	ΔE 0.2 ΔRGB(1,-1,-1)	fill recolour ΔRGB(+1,-1,-1) (ΔE 0.2)
AntialiasCoverage	252,202 → 252,204	0.001116	ΔE 0.4 ΔRGB(0,0,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	252,120 → 252,121	0.000744	ΔE 0.4 ΔRGB(0,1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	252,207 → 252,208	0.000372	ΔRGB(0,-1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	252,12 → 252,12	0.000186	ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	60,196 → 60,196	0.000186	ΔRGB(-3,35,53)	antialiasing coverage residue on a shared outline
AntialiasCoverage	156,196 → 156,196	0.000186	ΔRGB(-1,1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	252,196 → 252,196	0.000186	ΔRGB(1,1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	60,208 → 60,208	0.000186	ΔRGB(24,42,1)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/border-image-source-families.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>border image source families</title>
6<style>
7  @page { size: 320px 240px; margin: 0; }
8  html, body { background: #ffffff; }
9  * { box-sizing: border-box; margin: 0; padding: 0; }
10  .box {
11    position: absolute;
12    width: 120px;
13    height: 88px;
14    border: 12px solid #ff00ff;
15    background: #f1f3f5;
16  }
17  .raster {
18    left: 16px;
19    top: 16px;
20    border-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAECAIAAAA8r+mnAAAAIElEQVR42mM4IScHR3I9NnDEgFNCzu0EHN1ZJQJHOCUAni4lgeO2HLIAAAAASUVORK5CYII=") 1 stretch;
21  }
22  .svg {
23    left: 160px;
24    top: 16px;
25    border-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='30' height='30'%3E%3Crect width='15' height='15' fill='%23e63946'/%3E%3Crect x='15' width='15' height='15' fill='%23457b9d'/%3E%3Crect y='15' width='15' height='15' fill='%232a9d8f'/%3E%3Crect x='15' y='15' width='15' height='15' fill='%23ffbe0b'/%3E%3C/svg%3E") 10 / 12px stretch;
26  }
27  .radial {
28    left: 16px;
29    top: 136px;
30    border-image: radial-gradient(circle, #ffbe0b 0 35%, #fb5607 36% 65%, #8338ec 66%) 18% / 12px round;
31  }
32  .conic {
33    left: 160px;
34    top: 136px;
35    border-image: 1 / 12px conic-gradient(from 45deg, #3a86ff, #06d6a0, #ff006e, #3a86ff) stretch;
36  }
37</style>
38</head>
39<body>
40  <div class="box raster"></div>
41  <div class="box svg"></div>
42  <div class="box radial"></div>
43  <div class="box conic"></div>
44</body>
45</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.21% · raw 0.26% (968 px) border-image-unavailable-source-fallback · unavailable-source-fallbackPASS via CSS-scale observation: stable same-coordinate outline phaseExtramissing 0.000677%extra 0.4%ΔE 1.5

why: visually accepted coverage phase; raw candidate adds paint absent from reference (0.4%)

An unavailable border-image source falls back to the authored per-side border colors, widths, and radii instead of suppressing the border or painting a placeholder.

regions (127 total; showing 64 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	124	379	0,0 → 160,96	56	total 0.3% · largest 0.04%
Extra	2	588	0,0 → 148,88	388	total 0.4% · largest 0.3%
Missing	1	1	160,78 → 160,78	1	total 0.000663% · largest 0.000663%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
Extra	24,0 → 148,0	0.3		candidate adds paint absent from reference (0.3%)
Extra	0,24 → 0,88	0.1		candidate adds paint absent from reference (0.1%)
AntialiasCoverage	142,85 → 153,92	0.04	ΔRGB(-1,-11,-8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	153,89 → 156,92	0.01	ΔRGB(-2,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	157,84 → 158,86	0.007294	ΔRGB(-2,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	148,93 → 150,94	0.007294	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	2,93 → 3,94	0.006631	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	20,0 → 22,0	0.004642	ΔRGB(-3,-3,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	7,7 → 8,8	0.004642	ΔRGB(-2,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,20 → 0,22	0.004642	ΔRGB(-3,-3,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	152,1 → 154,1	0.003979	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	159,7 → 159,8	0.003979	ΔRGB(-2,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	142,96 → 144,96	0.003979	ΔRGB(-2,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	149,0 → 151,0	0.003316	ΔRGB(-3,-3,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	19,1 → 20,1	0.003316	ΔRGB(-2,-3,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	160,10 → 160,11	0.003316	ΔRGB(-5,-5,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	1,19 → 1,20	0.003316	ΔRGB(-3,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	160,78 → 160,80	0.003316	ΔRGB(-5,-5,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,89 → 0,90	0.003316	ΔRGB(-3,-3,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	6,96 → 7,96	0.003316	ΔRGB(-3,-3,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	154,2 → 155,2	0.002653	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	155,2 → 156,3	0.002653	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	11,4 → 12,4	0.002653	ΔRGB(-2,-2,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	10,4 → 11,4	0.002653	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	158,5 → 158,5	0.002653	ΔRGB(-2,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	9,5 → 10,5	0.002653	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	158,6 → 159,6	0.002653	ΔRGB(-2,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	5,9 → 5,10	0.002653	ΔRGB(-2,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,10 → 4,11	0.002653	ΔRGB(-2,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,11 → 4,12	0.002653	ΔRGB(-2,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	160,80 → 160,81	0.002653	ΔRGB(-3,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	156,88 → 156,88	0.002653	ΔRGB(9,3,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	152,92 → 152,92	0.002653	ΔRGB(10,7,8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	144,96 → 145,96	0.002653	ΔRGB(-2,-3,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	151,1 → 152,1	0.001989	ΔRGB(-3,-3,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	18,1 → 18,1	0.001989	ΔRGB(-2,-3,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	16,1 → 17,1	0.001989	ΔRGB(-3,-3,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	15,2 → 15,2	0.001989	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	156,4 → 157,4	0.001989	ΔRGB(-3,-3,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	160,8 → 160,9	0.001989	ΔRGB(-3,-3,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	2,15 → 2,15	0.001989	ΔRGB(-2,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	1,16 → 1,17	0.001989	ΔRGB(-3,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	1,18 → 1,18	0.001989	ΔRGB(-3,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	159,82 → 159,82	0.001989	ΔRGB(-3,-3,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	159,83 → 159,83	0.001989	ΔRGB(-2,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	1,91 → 1,91	0.001989	ΔRGB(-2,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	147,95 → 147,95	0.001989	ΔRGB(-3,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	146,95 → 146,95	0.001989	ΔRGB(-3,-3,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	5,96 → 6,96	0.001989	ΔRGB(-3,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	16,2 → 16,2	0.001326	ΔRGB(-2,-3,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	14,2 → 14,2	0.001326	ΔRGB(-1,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	13,3 → 14,3	0.001326	ΔRGB(-1,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	13,3 → 13,3	0.001326	ΔRGB(-1,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	12,3 → 12,3	0.001326	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	156,4 → 156,4	0.001326	ΔRGB(-1,-1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	154,4 → 155,4	0.001326	ΔRGB(-1,-1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	153,5 → 153,5	0.001326	ΔRGB(-1,-1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	152,6 → 152,6	0.001326	ΔRGB(-1,-1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	3,12 → 3,12	0.001326	ΔRGB(-1,0,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	3,13 → 3,13	0.001326	ΔRGB(-2,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	3,13 → 3,14	0.001326	ΔRGB(-2,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	2,14 → 2,14	0.001326	ΔRGB(-2,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	2,16 → 2,16	0.001326	ΔRGB(-3,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	159,84 → 159,84	0.001326	ΔRGB(-3,-2,-2)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/border-image-unavailable-source-fallback.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>unavailable border image falls back to border styles</title>
6<style>
7  @page { size: 240px 160px; margin: 0; }
8  html, body { background: #ffffff; }
9  * { box-sizing: border-box; margin: 0; padding: 0; }
10  .box {
11    width: 160px;
12    height: 96px;
13    margin: 32px 40px;
14    background: #f1f3f5;
15    border-width: 12px 16px 10px 14px;
16    border-style: solid;
17    border-color: #d62828 #2a9d8f #264653 #f4a261;
18    border-radius: 24px 12px 20px 8px;
19    border-image-source: url("data:image/png;base64,bm90LWFuLWltYWdl");
20    border-image-slice: 1;
21  }
22</style>
23</head>
24<body><div class="box"></div></body>
25</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.13% · raw 0.17% (1562 px) border-image-intrinsic-overlap-reset · intrinsic-svg-overlap-global-scaling-resetPASS via CSS-scale observation: stable same-coordinate outline phaseExtramissing 0.2%extra 0.5%ΔE 11.3

why: visually accepted coverage phase; raw candidate adds paint absent from reference (0.5%)

Border images use SVG concrete object sizing, preserve overlapping source slices, scale all destination widths with one global factor, and reset every border-image longhand through the border shorthand.

regions (239 total; showing 64 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
Missing	2	289	172,0 → 312,0	145	total 0.04% · largest 0.02%
ColorErr	236	548	126,0 → 312,92	49	total 0.08% · largest 0.007434%
Extra	1	725	0,0 → 140,92	725	total 0.1% · largest 0.1%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
Extra	0,0 → 140,92	0.1		candidate adds paint absent from reference (0.1%)
Missing	172,0 → 218,0	0.02		candidate lacks paint present in reference (0.02%)
Missing	266,0 → 312,0	0.02		candidate lacks paint present in reference (0.02%)
AntialiasCoverage	276,46 → 291,46	0.007434	ΔRGB(-27,34,-14)	antialiasing coverage residue on a shared outline
AntialiasCoverage	193,46 → 208,46	0.007434	ΔRGB(-27,34,-14)	antialiasing coverage residue on a shared outline
AntialiasCoverage	126,0 → 126,14	0.006676	ΔRGB(0,-1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	126,78 → 126,92	0.006676	ΔRGB(0,-1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	172,46 → 185,46	0.006221	ΔRGB(-161,66,87)	antialiasing coverage residue on a shared outline
AntialiasCoverage	300,46 → 312,46	0.005917	ΔRGB(213,33,-132)	antialiasing coverage residue on a shared outline
AntialiasCoverage	266,46 → 267,46	0.000607	ΔRGB(-161,66,87)	antialiasing coverage residue on a shared outline
AntialiasCoverage	217,46 → 218,46	0.000455	ΔRGB(151,23,-93)	antialiasing coverage residue on a shared outline
AntialiasCoverage	301,1 → 301,2	0.000303	ΔRGB(0,1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	299,6 → 299,6	0.000303	ΔRGB(-1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	192,7 → 192,8	0.000303	ΔRGB(0,0,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	215,8 → 215,8	0.000303	ΔRGB(-1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	215,9 → 215,9	0.000303	ΔRGB(-1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	297,10 → 297,10	0.000303	ΔRGB(0,1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	295,12 → 295,12	0.000303	ΔRGB(0,1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	271,13 → 271,14	0.000303	ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	269,16 → 269,16	0.000303	ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	182,25 → 182,25	0.000303	ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	180,27 → 180,27	0.000303	ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	310,28 → 310,29	0.000303	ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	179,29 → 179,29	0.000303	ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	309,29 → 309,29	0.000303	ΔRGB(1,1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	178,31 → 178,31	0.000303	ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	178,31 → 178,32	0.000303	ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	283,33 → 283,33	0.000303	ΔRGB(0,-1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	177,34 → 177,34	0.000303	ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	200,34 → 200,35	0.000303	ΔRGB(0,-1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	175,36 → 175,36	0.000303	ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	174,37 → 174,38	0.000303	ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	173,40 → 173,40	0.000303	ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	172,42 → 172,42	0.000303	ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	194,45 → 194,45	0.000303	ΔRGB(0,-1,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	208,47 → 208,47	0.000303	ΔRGB(-1,1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	312,51 → 312,52	0.000303	ΔRGB(1,1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	311,52 → 311,52	0.000303	ΔRGB(1,1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	310,53 → 310,54	0.000303	ΔRGB(2,1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	310,54 → 310,54	0.000303	ΔRGB(1,1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	309,56 → 309,56	0.000303	ΔRGB(1,1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	309,56 → 309,57	0.000303	ΔRGB(1,0,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	308,58 → 308,58	0.000303	ΔRGB(1,1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	307,60 → 307,60	0.000303	ΔRGB(1,1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	306,62 → 306,62	0.000303	ΔRGB(1,1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	305,62 → 305,63	0.000303	ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	304,65 → 304,65	0.000303	ΔRGB(1,0,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	303,66 → 303,67	0.000303	ΔRGB(1,1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	301,69 → 301,69	0.000303	ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	300,71 → 300,71	0.000303	ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	218,71 → 218,72	0.000303	ΔRGB(1,1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	217,73 → 217,73	0.000303	ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	215,75 → 215,76	0.000303	ΔRGB(1,1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	269,84 → 269,84	0.000303	ΔRGB(1,-1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	291,87 → 291,88	0.000303	ΔRGB(0,0,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	291,88 → 291,88	0.000303	ΔRGB(0,0,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	290,90 → 290,90	0.000303	ΔRGB(-1,0,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	288,92 → 288,92	0.000303	ΔRGB(0,0,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	196,0 → 196,0	0.000152	ΔRGB(-1,0,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	196,1 → 196,1	0.000152	ΔRGB(0,1,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	278,1 → 278,1	0.000152	ΔRGB(0,0,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	195,2 → 195,2	0.000152	ΔRGB(0,0,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	278,2 → 278,2	0.000152	ΔRGB(0,0,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	195,3 → 195,3	0.000152	ΔRGB(-1,1,0)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/border-image-intrinsic-overlap-reset.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>border image intrinsic sizing overlap and reset</title>
6<style>
7  @page { size: 360px 264px; margin: 0; }
8  html, body { width: 360px; height: 260px; background: #fff; }
9  html, body, div { box-sizing: border-box; margin: 0; padding: 0; }
10  .box { position: absolute; width: 140px; height: 92px; border: 10px solid #ef476f; background: #f4f6f8; }
11  .intrinsic { left: 24px; top: 24px; border-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 2 1'%3E%3Crect width='1' height='1' fill='%231185ab'/%3E%3Crect x='1' width='1' height='1' fill='%23ffd166'/%3E%3C/svg%3E") 25% / 14px stretch; }
12  .overlap { left: 196px; top: 24px; border-image: linear-gradient(135deg, #e63946 0 25%, #457b9d 25% 50%, #2a9d8f 50% 75%, #ffbe0b 75%) 70% 80% / 90px stretch; }
13  .reset { left: 110px; top: 148px; border-image: linear-gradient(#7b2cbf, #3a86ff) 12 / 5 / 3 round; border: 10px solid #264653; border-image-source: linear-gradient(90deg, #f4a261, #2a9d8f); }
14</style>
15</head>
16<body>
17  <div class="box intrinsic"></div>
18  <div class="box overlap"></div>
19  <div class="box reset"></div>
20</body>
21</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0% · raw 0.04% (148 px) border-image-width-multiplier · width-number-multiplierPASS via raw same-coordinate visibility policyColorValueΔE 0.4

why: fill colour differs (ΔE 0.4)

border-image-width:3 makes the image border 3× the computed 8px physical border width, dividing the border-image area 24px from every edge. Catches implementations that parse slices but always use the physical border width for the destination patches.

regions (4 total; showing 4 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	4	148	1,24 → 180,60	75	total 0.10% · largest 0.05% · max ΔE 0.5

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
ColorValue	156,24 → 180,24	0.05	ΔE 0.5 ΔRGB(-1,-1,-1)	fill recolour ΔRGB(-1,-1,-1) (ΔE 0.5)
ColorValue	1,24 → 24,24	0.05	ΔE 0.2 ΔRGB(0,1,1)	fill recolour ΔRGB(+0,+1,+1) (ΔE 0.2)
AntialiasCoverage	158,27 → 158,27	0.000672	ΔE 0.3 ΔRGB(-1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	24,60 → 24,60	0.000672	ΔRGB(0,1,0)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/border-image-width-multiplier.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>border-image width multiplier</title>
6<style>
7@page{size:240px 144px;margin:0}
8html{font-family:ParitySans;line-height:1.5}
9*{margin:0;box-sizing:border-box}
10html,body{background:#ffffff}
11body{padding:30px}
12.box{
13  width:180px;
14  height:84px;
15  border:8px solid transparent;
16  background:#f1faee;
17  border-image:linear-gradient(135deg,#e63946 0%,#f1faee 50%,#457b9d 100%) 1;
18  border-image-width:3;
19}
20</style>
21</head>
22<body>
23<div class="box"></div>
24</body>
25</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0% · raw 0.02% (79 px) border-image-outset-number · outset-number-multiplierPASS via raw same-coordinate visibility policyAntialiasCoverageΔE 0.4

why: antialiasing coverage residue on a shared outline

border-image shorthand outset 2 extends the image area by 2× the computed 8px physical border on every edge without changing layout. Catches implementations that parse the first slash but discard the second slash/outset component.

regions (10 total; showing 10 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	10	79	0,0 → 152,72	14	total 0.07% · largest 0.01% · max ΔE 0.7

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	144,68 → 144,72	0.01	ΔE 0.2 ΔRGB(-1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	144,3 → 144,6	0.01	ΔE 0.7 ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
ColorValue	0,8 → 4,8	0.01	ΔE 0.2 ΔRGB(0,1,1)	fill recolour ΔRGB(+0,+1,+1) (ΔE 0.2)
ColorValue	4,8 → 8,8	0.01	ΔE 0.2 ΔRGB(0,1,1)	fill recolour ΔRGB(+0,+1,+1) (ΔE 0.2)
ColorValue	145,8 → 148,8	0.01	ΔE 0.5 ΔRGB(-1,-1,0)	fill recolour ΔRGB(-1,-1,+0) (ΔE 0.5)
AntialiasCoverage	144,64 → 144,66	0.008366	ΔE 0.4 ΔRGB(0,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	150,8 → 152,8	0.005577	ΔE 0.7 ΔRGB(-1,0,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	144,0 → 144,1	0.003718	ΔE 0.3 ΔRGB(-1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	105,5 → 105,5	0.000930	ΔE 0.7 ΔRGB(0,1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	74,70 → 74,70	0.000930	ΔE 0.7 ΔRGB(0,-1,0)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/border-image-outset-number.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>border-image outset number</title>
6<style>
7@page{size:240px 144px;margin:0}
8html{font-family:ParitySans;line-height:1.5}
9*{margin:0;box-sizing:border-box}
10html,body{background:#ffffff}
11body{padding:40px}
12.box{
13  width:120px;
14  height:40px;
15  border:8px solid transparent;
16  background:#f1faee;
17  border-image:linear-gradient(135deg,#e63946 0%,#f1faee 50%,#457b9d 100%) 1 / 1 / 2;
18}
19</style>
20</head>
21<body>
22<div class="box"></div>
23</body>
24</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.02% · raw 0.02% (53 px) border-image-repeat-horizontal · repeat-horizontal-stretch-verticalPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 5.9

why: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

border-image-repeat: repeat stretch tiles the top and bottom edge slices at their proportional width, centered with clipped partial end tiles, while the side slices remain stretched. Catches parsers that reject the repeat keyword and render no image, or render every edge as one stretched patch.

regions (3 total; showing 3 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	3	53	8,0 → 184,72	26	total 0.04% · largest 0.02%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	184,0 → 184,8	0.02	ΔRGB(-27,-5,16)	antialiasing coverage residue on a shared outline
AntialiasCoverage	184,64 → 184,72	0.02	ΔRGB(-27,-5,16)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,64 → 8,64	0.000736	ΔRGB(21,-8,-10)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/border-image-repeat-horizontal.html

1<!doctype html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>border-image horizontal repeat</title>
6<style>
7@page{size:240px 120px;margin:0}
8html{font-family:ParitySans;line-height:1.5}
9*{margin:0;box-sizing:border-box}
10html,body{background:#fff}
11body{padding:24px}
12.box{
13  width:192px;
14  height:72px;
15  border:8px solid transparent;
16  background:#f1faee;
17  border-image:linear-gradient(to right,#e63946 0 25%,#ffbe0b 25% 50%,#457b9d 50% 75%,#2a9d8f 75% 100%) 32 / 1 / 0 repeat stretch;
18}
19</style>
20</head>
21<body><div class="box"></div></body>
22</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0% · raw 0.01% (36 px) border-image-outset-em · outset-font-relative-lengthPASS via raw same-coordinate visibility policyColorValueΔE 0.3

why: fill colour differs (ΔE 0.3)

border-image outset .25em resolves against the element's 40px font size, extending the painted image area by 10px on every side without changing layout. Catches parsers that accept only absolute units and discard the entire border image for a valid font-relative CSS length.

regions (6 total; showing 6 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	6	36	0,5 → 164,76	10	total 0.03% · largest 0.007369% · max ΔE 0.5

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
ColorValue	0,8 → 3,8	0.007369	ΔE 0.2 ΔRGB(0,1,1)	fill recolour ΔRGB(+0,+1,+1) (ΔE 0.2)
AntialiasCoverage	161,8 → 164,8	0.007369	ΔE 0.4 ΔRGB(0,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	5,8 → 8,8	0.005896	ΔE 0.2 ΔRGB(0,1,0)	antialiasing coverage residue on a shared outline
ColorValue	157,8 → 158,8	0.004422	ΔE 0.3 ΔRGB(-1,0,0)	fill recolour ΔRGB(-1,+0,+0) (ΔE 0.3)
AntialiasCoverage	115,5 → 115,5	0.000737	ΔE 0.5 ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,76 → 8,76	0.000737	ΔRGB(0,0,1)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/border-image-outset-em.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>border-image outset em</title>
6<style>
7@page{size:240px 144px;margin:0}
8html{font-family:ParitySans;line-height:1.5}
9*{margin:0;box-sizing:border-box}
10html,body{background:#ffffff}
11body{padding:32px}
12.box{
13  width:144px;
14  height:64px;
15  font-size:40px;
16  border:8px solid transparent;
17  background:#f1faee;
18  border-image:linear-gradient(135deg,#e63946 0%,#f1faee 50%,#457b9d 100%) 1 / 1 / .25em;
19}
20</style>
21</head>
22<body>
23<div class="box"></div>
24</body>
25</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.000356% · raw 0.000356% (1 px) border-image-round-horizontal · round-horizontal-stretch-verticalPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 4.8

why: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

border-image-repeat: round stretch resizes each proportional top and bottom edge tile horizontally until exactly six whole tiles fit, while side slices remain stretched. Catches implementations that tile at the unrounded size or stretch the whole edge once.

regions (1 total; showing 1 representative)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	1	1	8,64 → 8,64	1	total 0.000736% · largest 0.000736%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	8,64 → 8,64	0.000736	ΔRGB(24,-12,-9)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/border-image-round-horizontal.html

1<!doctype html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>border-image horizontal round</title>
6<style>
7@page{size:240px 120px;margin:0}
8html{font-family:ParitySans;line-height:1.5}
9*{margin:0;box-sizing:border-box}
10html,body{background:#fff}
11body{padding:24px}
12.box{
13  width:192px;
14  height:72px;
15  border:8px solid transparent;
16  background:#f1faee;
17  border-image:linear-gradient(to right,#e63946 0 25%,#ffbe0b 25% 50%,#457b9d 50% 75%,#2a9d8f 75% 100%) 32 / 1 / 0 round stretch;
18}
19</style>
20</head>
21<body><div class="box"></div></body>
22</html>

PASS exact match border-image-gradient-slice · gradient-slice

border-image paints a linear-gradient source into a transparent physical border; catches engines that ignore border-image or fall back to a plain/transparent border.

border-radius — 100.00% verified visual parity PASS 12 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS visually equivalent · no rejecting defect · thresholded evidence 0.001600% · raw 0.001600% (8 px) border-radius-x-linear-gradient · x-linear-gradientPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 3.3

why: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

Combo: border-radius rounding must clip a linear-gradient background fill (same-category combination).

regions (8 total; showing 8 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	8	8	7,7 → 233,153	1	total 0.002133% · largest 0.000267%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	12,7 → 12,7	0.000267	ΔRGB(3,13,12)	antialiasing coverage residue on a shared outline
AntialiasCoverage	228,7 → 228,7	0.000267	ΔRGB(13,9,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	7,12 → 7,12	0.000267	ΔRGB(3,13,13)	antialiasing coverage residue on a shared outline
AntialiasCoverage	233,12 → 233,12	0.000267	ΔRGB(14,9,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	7,148 → 7,148	0.000267	ΔRGB(3,13,13)	antialiasing coverage residue on a shared outline
AntialiasCoverage	233,148 → 233,148	0.000267	ΔRGB(14,9,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	12,153 → 12,153	0.000267	ΔRGB(3,13,12)	antialiasing coverage residue on a shared outline
AntialiasCoverage	228,153 → 228,153	0.000267	ΔRGB(13,9,3)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/border-radius-x-linear-gradient.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>interaction: border-radius clipping a linear-gradient background</title>
6<style>
7  @page { size: 320px 160px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 240px;
13    height: 160px;
14    background-image: linear-gradient(to right, #d32f2f, #1976d2);
15    border-radius: 32px;
16  }
17</style>
18</head>
19<body>
20  <div class="box"></div>
21</body>
22</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.000508% · raw 0.000508% (2 px) border-radius-two-values · two-value-shorthandPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 4.1

why: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

border-radius two-value shorthand (TL/BR vs TR/BL diagonal radii).

regions (2 total; showing 2 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	2	2	21,8 → 179,132	1	total 0.000731% · largest 0.000365%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	179,8 → 179,8	0.000365	ΔRGB(7,22,15)	antialiasing coverage residue on a shared outline
AntialiasCoverage	21,132 → 21,132	0.000365	ΔRGB(-6,-17,-12)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/border-radius-two-values.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>border-radius two values</title>
6<style>
7  @page { size: 280px 144px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 200px;
13    height: 140px;
14    background-color: #ad1457;
15    border-radius: 12px 48px;
16  }
17</style>
18</head>
19<body>
20  <div class="box"></div>
21</body>
22</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.000254% · raw 0.000254% (1 px) border-radius-four-values · four-value-shorthandPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 4.1

why: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

border-radius 1-4 value shorthand assigning a distinct radius to each corner.

regions (1 total; showing 1 representative)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	1	1	193,123 → 193,123	1	total 0.000365% · largest 0.000365%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	193,123 → 193,123	0.000365	ΔRGB(-9,-14,-6)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/border-radius-four-values.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>border-radius four values</title>
6<style>
7  @page { size: 280px 144px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 200px;
13    height: 140px;
14    background-color: #6a1b9a;
15    border-radius: 10px 25px 40px 55px;
16  }
17</style>
18</head>
19<body>
20  <div class="box"></div>
21</body>
22</html>

PASS exact match border-radius-circle · 50pct-circle

Square box turned into a filled circle via border-radius 50%.

PASS exact match border-radius-clamped · overlap-clamping

border-radius larger than half the box is clamped/normalized to fit.

PASS exact match border-radius-corner-longhands · corner-longhands

Per-corner border-radius longhands (top-left + bottom-right rounded, others square).

PASS exact match border-radius-ellipse-nonsquare · 50pct-nonsquare

border-radius 50% on a non-square box (elliptical corners).

PASS exact match border-radius-elliptical · elliptical-slash

Elliptical border-radius via the Rx / Ry slash syntax.

PASS exact match border-radius-invalid-unitless-preserves-prior · invalid-declaration-discard

A nonzero unitless border-radius is invalid and cannot replace the prior valid radius.

PASS exact match border-radius-per-corner · per-corner

Filled box with two rounded corners and two square corners.

PASS exact match border-radius-percentage · percentage

border-radius given as a non-50% percentage of the box.

PASS exact match border-radius-uniform · uniform

Filled box with a uniform 24px border-radius and a solid border.

border-style — 100.00% verified visual parity PASS 7 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS visually equivalent · no rejecting defect · thresholded evidence 0.87% · raw 0.89% (3571 px) border-rounded-mixed-styles · rounded-mixed-per-sidePASS via CSS-scale observation: stable same-coordinate outline phaseExtramissing 0.02%extra 0.3%ΔE 3.0

why: visually accepted coverage phase; raw candidate adds paint absent from reference (0.3%)

Solid, dashed, dotted, and double sides follow one nonuniform rounded border geometry and meet only at their corner frontiers.

regions (331 total; showing 64 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	178	2678	0,0 → 208,128	150	total 1.0% · largest 0.06% · max ΔE 3.4
Extra	118	852	0,0 → 204,123	450	total 0.3% · largest 0.2%
Missing	35	41	28,23 → 208,128	4	total 0.02% · largest 0.001532%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
Extra	40,0 → 184,0	0.2		candidate adds paint absent from reference (0.2%)
Extra	0,32 → 0,88	0.07		candidate adds paint absent from reference (0.07%)
AntialiasCoverage	4,91 → 13,115	0.06	ΔRGB(-32,-87,-53)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,11 → 13,30	0.05	ΔRGB(-35,-97,-59)	antialiasing coverage residue on a shared outline
AntialiasCoverage	20,115 → 28,127	0.05	ΔRGB(-92,-104,-32)	antialiasing coverage residue on a shared outline
AntialiasCoverage	25,116 → 33,128	0.05	ΔRGB(92,104,32)	antialiasing coverage residue on a shared outline
AntialiasCoverage	51,116 → 57,128	0.04	ΔRGB(94,105,33)	antialiasing coverage residue on a shared outline
AntialiasCoverage	44,116 → 50,128	0.04	ΔRGB(-94,-105,-33)	antialiasing coverage residue on a shared outline
AntialiasCoverage	75,116 → 81,128	0.04	ΔRGB(92,104,32)	antialiasing coverage residue on a shared outline
AntialiasCoverage	68,116 → 74,128	0.04	ΔRGB(-92,-104,-33)	antialiasing coverage residue on a shared outline
AntialiasCoverage	98,116 → 105,128	0.04	ΔRGB(70,79,25)	antialiasing coverage residue on a shared outline
AntialiasCoverage	92,116 → 98,128	0.04	ΔRGB(-80,-90,-28)	antialiasing coverage residue on a shared outline
AntialiasCoverage	116,116 → 122,128	0.04	ΔRGB(-66,-74,-23)	antialiasing coverage residue on a shared outline
AntialiasCoverage	122,116 → 129,128	0.04	ΔRGB(70,79,25)	antialiasing coverage residue on a shared outline
AntialiasCoverage	187,111 → 195,122	0.04	ΔRGB(-66,-74,-23)	antialiasing coverage residue on a shared outline
AntialiasCoverage	140,116 → 146,128	0.04	ΔRGB(-66,-74,-23)	antialiasing coverage residue on a shared outline
AntialiasCoverage	146,116 → 153,128	0.04	ΔRGB(66,74,23)	antialiasing coverage residue on a shared outline
AntialiasCoverage	194,20 → 205,25	0.03	ΔRGB(-129,-72,-67)	antialiasing coverage residue on a shared outline
AntialiasCoverage	164,116 → 171,128	0.03	ΔRGB(-47,-53,-16)	antialiasing coverage residue on a shared outline
AntialiasCoverage	196,105 → 207,109	0.03	ΔRGB(129,72,67)	antialiasing coverage residue on a shared outline
AntialiasCoverage	196,59 → 208,59	0.03	ΔRGB(-32,-18,-17)	antialiasing coverage residue on a shared outline
AntialiasCoverage	196,71 → 208,71	0.03	ΔRGB(145,82,76)	antialiasing coverage residue on a shared outline
AntialiasCoverage	172,116 → 176,127	0.03	ΔRGB(54,61,20)	antialiasing coverage residue on a shared outline
AntialiasCoverage	191,9 → 199,18	0.02	ΔRGB(-1,20,14)	antialiasing coverage residue on a shared outline
AntialiasCoverage	190,111 → 199,119	0.02	ΔRGB(25,-1,25)	antialiasing coverage residue on a shared outline
AntialiasCoverage	196,34 → 208,36	0.02	ΔRGB(89,49,46)	antialiasing coverage residue on a shared outline
AntialiasCoverage	196,95 → 208,95	0.01	ΔRGB(-255,-143,-133)	antialiasing coverage residue on a shared outline
AntialiasCoverage	16,16 → 19,19	0.006895	ΔRGB(49,0,12)	antialiasing coverage residue on a shared outline
AntialiasCoverage	208,37 → 208,41	0.004597	ΔRGB(165,95,98)	antialiasing coverage residue on a shared outline
AntialiasCoverage	195,5 → 196,6	0.004214	ΔRGB(57,53,47)	antialiasing coverage residue on a shared outline
AntialiasCoverage	19,125 → 21,126	0.004214	ΔRGB(0,0,2)	antialiasing coverage residue on a shared outline
Extra	35,0 → 37,0	0.003448		candidate adds paint absent from reference (0.003448%)
Extra	0,91 → 0,94	0.003448		candidate adds paint absent from reference (0.003448%)
AntialiasCoverage	12,119 → 13,120	0.003448	ΔRGB(0,1,8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	164,128 → 167,128	0.003448	ΔE 2.9 ΔRGB(0,2,10)	antialiasing coverage residue on a shared outline
Extra	0,28 → 0,30	0.002681		candidate adds paint absent from reference (0.002681%)
Extra	32,1 → 34,1	0.002298		candidate adds paint absent from reference (0.002298%)
AntialiasCoverage	201,116 → 202,116	0.002298	ΔRGB(210,121,129)	antialiasing coverage residue on a shared outline
Extra	1,95 → 1,96	0.001915		candidate adds paint absent from reference (0.001915%)
AntialiasCoverage	9,116 → 10,117	0.001915	ΔRGB(7,21,13)	antialiasing coverage residue on a shared outline
AntialiasCoverage	29,128 → 30,128	0.001915	ΔE 3.4 ΔRGB(0,3,12)	antialiasing coverage residue on a shared outline
Missing	167,128 → 168,128	0.001532		candidate lacks paint present in reference (0.001532%)
Extra	186,0 → 187,0	0.001532		candidate adds paint absent from reference (0.001532%)
Extra	31,1 → 32,1	0.001532		candidate adds paint absent from reference (0.001532%)
Extra	29,1 → 30,1	0.001532		candidate adds paint absent from reference (0.001532%)
Extra	12,9 → 13,9	0.001532		candidate adds paint absent from reference (0.001532%)
Extra	11,10 → 12,10	0.001532		candidate adds paint absent from reference (0.001532%)
Extra	5,16 → 6,16	0.001532		candidate adds paint absent from reference (0.001532%)
Extra	4,18 → 4,18	0.001532		candidate adds paint absent from reference (0.001532%)
Extra	1,27 → 1,28	0.001532		candidate adds paint absent from reference (0.001532%)
Extra	1,97 → 1,98	0.001532		candidate adds paint absent from reference (0.001532%)
AntialiasCoverage	205,22 → 205,23	0.001532	ΔRGB(0,3,15)	antialiasing coverage residue on a shared outline
AntialiasCoverage	206,24 → 206,25	0.001532	ΔRGB(0,3,15)	antialiasing coverage residue on a shared outline
AntialiasCoverage	206,26 → 206,27	0.001532	ΔRGB(0,3,15)	antialiasing coverage residue on a shared outline
AntialiasCoverage	206,27 → 206,28	0.001532	ΔRGB(0,4,17)	antialiasing coverage residue on a shared outline
AntialiasCoverage	207,30 → 207,31	0.001532	ΔRGB(0,4,19)	antialiasing coverage residue on a shared outline
AntialiasCoverage	207,32 → 207,33	0.001532	ΔRGB(0,4,19)	antialiasing coverage residue on a shared outline
AntialiasCoverage	208,106 → 208,107	0.001532	ΔE 2.9 ΔRGB(0,4,19)	antialiasing coverage residue on a shared outline
AntialiasCoverage	204,113 → 204,114	0.001532	ΔRGB(234,136,146)	antialiasing coverage residue on a shared outline
AntialiasCoverage	200,117 → 200,118	0.001532	ΔRGB(223,130,139)	antialiasing coverage residue on a shared outline
AntialiasCoverage	14,122 → 15,122	0.001532	ΔRGB(0,0,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	18,124 → 18,124	0.001532	ΔRGB(0,2,10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	174,127 → 175,127	0.001532	ΔRGB(0,3,15)	antialiasing coverage residue on a shared outline
Extra	188,1 → 188,1	0.001149		candidate adds paint absent from reference (0.001149%)

source · cases/backgrounds-borders/border-rounded-mixed-styles.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>rounded mixed border styles</title>
6<style>
7  @page { size: 256px 160px; margin: 0; }
8  html, body { background: #ffffff; }
9  * { margin: 0; padding: 0; box-sizing: border-box; }
10  .box {
11    width: 208px;
12    height: 128px;
13    margin: 16px 24px;
14    background: #fff8e1;
15    border-width: 12px;
16    border-color: #263238 #00695c #4527a0 #ad1457;
17    border-style: solid dashed dotted double;
18    border-radius: 40px 24px 48px 32px / 32px 44px 24px 40px;
19  }
20</style>
21</head>
22<body><div class="box"></div></body>
23</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.87% · raw 0.87% (2867 px) border-style-dotted · dottedPASS via CSS-scale observation: sub-CSS shared-outline coverageAntialiasCoveragemissing 1.1%extra 1.0%ΔE 8.7

why: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

Box with a 6px dotted border.

regions (1109 total; showing 64 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	826	2528	0,0 → 200,120	19	total 1.1% · largest 0.008107%
Extra	136	164	0,0 → 200,120	4	total 0.07% · largest 0.001707%
Missing	147	175	0,0 → 199,120	3	total 0.07% · largest 0.001280%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	85,0 → 86,4	0.008107	ΔRGB(34,20,22)	antialiasing coverage residue on a shared outline
AntialiasCoverage	89,0 → 91,4	0.008107	ΔRGB(-34,-20,-22)	antialiasing coverage residue on a shared outline
AntialiasCoverage	85,115 → 86,119	0.008107	ΔRGB(34,20,22)	antialiasing coverage residue on a shared outline
AntialiasCoverage	89,115 → 91,119	0.008107	ΔRGB(-34,-20,-22)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,114 → 4,115	0.006827	ΔRGB(89,52,56)	antialiasing coverage residue on a shared outline
AntialiasCoverage	196,114 → 199,115	0.006827	ΔRGB(72,43,46)	antialiasing coverage residue on a shared outline
AntialiasCoverage	73,2 → 74,5	0.005973	ΔRGB(44,26,28)	antialiasing coverage residue on a shared outline
AntialiasCoverage	102,2 → 103,5	0.005973	ΔRGB(-58,-34,-37)	antialiasing coverage residue on a shared outline
AntialiasCoverage	2,80 → 5,81	0.005973	ΔRGB(49,29,32)	antialiasing coverage residue on a shared outline
AntialiasCoverage	195,80 → 198,81	0.005973	ΔRGB(49,29,32)	antialiasing coverage residue on a shared outline
AntialiasCoverage	122,114 → 125,115	0.005973	ΔRGB(24,14,15)	antialiasing coverage residue on a shared outline
AntialiasCoverage	147,114 → 150,115	0.005973	ΔRGB(-21,-12,-13)	antialiasing coverage residue on a shared outline
AntialiasCoverage	73,115 → 74,118	0.005973	ΔRGB(44,26,28)	antialiasing coverage residue on a shared outline
AntialiasCoverage	102,115 → 103,118	0.005973	ΔRGB(-58,-34,-37)	antialiasing coverage residue on a shared outline
AntialiasCoverage	5,1 → 6,4	0.005547	ΔRGB(38,23,24)	antialiasing coverage residue on a shared outline
AntialiasCoverage	1,5 → 4,6	0.005547	ΔRGB(38,23,24)	antialiasing coverage residue on a shared outline
AntialiasCoverage	1,62 → 4,63	0.005547	ΔRGB(-45,-26,-29)	antialiasing coverage residue on a shared outline
AntialiasCoverage	195,62 → 198,63	0.005547	ΔRGB(-45,-26,-29)	antialiasing coverage residue on a shared outline
AntialiasCoverage	194,1 → 194,4	0.004693	ΔRGB(110,64,70)	antialiasing coverage residue on a shared outline
AntialiasCoverage	170,4 → 172,6	0.004693	ΔRGB(24,14,15)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,50 → 2,51	0.004693	ΔRGB(-21,-12,-13)	antialiasing coverage residue on a shared outline
AntialiasCoverage	197,50 → 199,51	0.004693	ΔRGB(-21,-12,-13)	antialiasing coverage residue on a shared outline
AntialiasCoverage	170,114 → 172,115	0.004693	ΔRGB(24,14,15)	antialiasing coverage residue on a shared outline
AntialiasCoverage	194,116 → 194,118	0.004693	ΔRGB(110,64,70)	antialiasing coverage residue on a shared outline
AntialiasCoverage	175,1 → 175,4	0.004267	ΔRGB(-89,-52,-56)	antialiasing coverage residue on a shared outline
AntialiasCoverage	77,3 → 78,5	0.004267	ΔRGB(-24,-14,-15)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,73 → 5,74	0.004267	ΔRGB(-34,-20,-21)	antialiasing coverage residue on a shared outline
AntialiasCoverage	194,73 → 196,74	0.004267	ΔRGB(-34,-20,-21)	antialiasing coverage residue on a shared outline
AntialiasCoverage	194,106 → 195,108	0.004267	ΔRGB(-29,-17,-19)	antialiasing coverage residue on a shared outline
AntialiasCoverage	77,115 → 78,116	0.004267	ΔRGB(-24,-14,-15)	antialiasing coverage residue on a shared outline
AntialiasCoverage	175,116 → 175,118	0.004267	ΔRGB(-89,-52,-56)	antialiasing coverage residue on a shared outline
AntialiasCoverage	121,1 → 122,2	0.003840	ΔRGB(46,27,29)	antialiasing coverage residue on a shared outline
AntialiasCoverage	60,1 → 61,4	0.003840	ΔRGB(36,22,23)	antialiasing coverage residue on a shared outline
AntialiasCoverage	122,5 → 124,6	0.003840	ΔRGB(34,20,21)	antialiasing coverage residue on a shared outline
AntialiasCoverage	149,5 → 150,6	0.003840	ΔRGB(-34,-20,-21)	antialiasing coverage residue on a shared outline
AntialiasCoverage	3,85 → 5,86	0.003840	ΔRGB(-63,-37,-41)	antialiasing coverage residue on a shared outline
AntialiasCoverage	195,85 → 196,86	0.003840	ΔRGB(-63,-37,-41)	antialiasing coverage residue on a shared outline
AntialiasCoverage	5,92 → 6,93	0.003840	ΔRGB(21,12,13)	antialiasing coverage residue on a shared outline
AntialiasCoverage	194,92 → 195,93	0.003840	ΔRGB(21,12,13)	antialiasing coverage residue on a shared outline
AntialiasCoverage	5,106 → 6,108	0.003840	ΔRGB(-34,-20,-21)	antialiasing coverage residue on a shared outline
AntialiasCoverage	1,107 → 2,108	0.003840	ΔRGB(-46,-27,-29)	antialiasing coverage residue on a shared outline
AntialiasCoverage	197,107 → 199,108	0.003840	ΔRGB(-46,-27,-29)	antialiasing coverage residue on a shared outline
AntialiasCoverage	60,116 → 61,118	0.003840	ΔRGB(36,22,23)	antialiasing coverage residue on a shared outline
AntialiasCoverage	121,117 → 122,119	0.003840	ΔRGB(46,27,29)	antialiasing coverage residue on a shared outline
AntialiasCoverage	134,0 → 136,1	0.003413	ΔRGB(31,18,20)	antialiasing coverage residue on a shared outline
AntialiasCoverage	137,0 → 138,1	0.003413	ΔRGB(-24,-14,-15)	antialiasing coverage residue on a shared outline
AntialiasCoverage	181,2 → 182,4	0.003413	ΔRGB(128,75,82)	antialiasing coverage residue on a shared outline
AntialiasCoverage	188,2 → 188,4	0.003413	ΔRGB(-113,-67,-72)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,68 → 5,69	0.003413	ΔRGB(24,14,15)	antialiasing coverage residue on a shared outline
AntialiasCoverage	195,68 → 196,69	0.003413	ΔRGB(24,14,15)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,95 → 6,96	0.003413	ΔRGB(-24,-14,-15)	antialiasing coverage residue on a shared outline
AntialiasCoverage	194,95 → 195,96	0.003413	ΔRGB(-24,-14,-15)	antialiasing coverage residue on a shared outline
AntialiasCoverage	135,114 → 137,114	0.003413	ΔRGB(15,9,10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	181,116 → 182,118	0.003413	ΔRGB(128,75,82)	antialiasing coverage residue on a shared outline
AntialiasCoverage	188,116 → 188,118	0.003413	ΔRGB(-113,-67,-72)	antialiasing coverage residue on a shared outline
AntialiasCoverage	199,117 → 200,119	0.003413	ΔRGB(-15,-9,-9)	antialiasing coverage residue on a shared outline
AntialiasCoverage	134,119 → 136,120	0.003413	ΔRGB(31,18,20)	antialiasing coverage residue on a shared outline
AntialiasCoverage	137,119 → 138,120	0.003413	ΔRGB(-24,-14,-15)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,0 → 1,1	0.002987	ΔRGB(22,13,14)	antialiasing coverage residue on a shared outline
AntialiasCoverage	163,3 → 164,4	0.002987	ΔRGB(-79,-46,-50)	antialiasing coverage residue on a shared outline
AntialiasCoverage	110,5 → 111,6	0.002987	ΔRGB(18,11,12)	antialiasing coverage residue on a shared outline
AntialiasCoverage	196,6 → 198,6	0.002987	ΔRGB(52,31,33)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,50 → 5,51	0.002987	ΔRGB(-18,-11,-12)	antialiasing coverage residue on a shared outline
AntialiasCoverage	194,50 → 195,51	0.002987	ΔRGB(-18,-11,-12)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/border-style-dotted.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>border style dotted</title>
6<style>
7  @page { size: 280px 120px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 200px;
13    height: 120px;
14    background-color: #ffffff;
15    border: 6px dotted #00695c;
16  }
17</style>
18</head>
19<body>
20  <div class="box"></div>
21</body>
22</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.84% · raw 0.84% (2043 px) border-style-four-value-shorthand · four-value-shorthandPASS via CSS-scale observation: sub-CSS shared-outline coverageColorValuemissing 0.2%ΔE 83.9

why: visually accepted coverage phase; raw fill recolour ΔRGB(-30,-25,-5) (ΔE 83.9)

border-style four-value shorthand assigns solid, dashed, dotted, and double styles to different sides; catches uniform-style parsing.

regions (188 total; showing 64 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	183	1842	0,0 → 120,80	1278	total 2.0% · largest 1.4% · max ΔE 83.9
Missing	5	201	4,0 → 120,80	50	total 0.2% · largest 0.05%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
ColorValue	0,3 → 112,80	1.4	ΔE 83.9 ΔRGB(-30,-25,-5)	fill recolour ΔRGB(-30,-25,-5) (ΔE 83.9)
Missing	120,0 → 120,16	0.05		candidate lacks paint present in reference (0.05%)
Missing	120,21 → 120,37	0.05		candidate lacks paint present in reference (0.05%)
Missing	120,43 → 120,58	0.05		candidate lacks paint present in reference (0.05%)
Missing	120,64 → 120,80	0.05		candidate lacks paint present in reference (0.05%)
AntialiasCoverage	112,16 → 120,16	0.03	ΔRGB(30,25,5)	antialiasing coverage residue on a shared outline
AntialiasCoverage	112,21 → 120,21	0.03	ΔRGB(30,25,5)	antialiasing coverage residue on a shared outline
AntialiasCoverage	112,59 → 120,59	0.03	ΔRGB(84,71,13)	antialiasing coverage residue on a shared outline
AntialiasCoverage	112,43 → 120,43	0.03	ΔRGB(-82,-69,-12)	antialiasing coverage residue on a shared outline
AntialiasCoverage	112,76 → 113,79	0.01	ΔRGB(31,27,5)	antialiasing coverage residue on a shared outline
AntialiasCoverage	118,79 → 120,80	0.01	ΔRGB(16,13,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	80,76 → 81,79	0.01	ΔRGB(31,27,5)	antialiasing coverage residue on a shared outline
AntialiasCoverage	96,76 → 97,79	0.01	ΔRGB(31,27,5)	antialiasing coverage residue on a shared outline
AntialiasCoverage	112,72 → 113,74	0.01	ΔRGB(21,19,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	102,73 → 103,74	0.007417	ΔRGB(-22,-18,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	32,74 → 32,76	0.007417	ΔRGB(20,17,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	48,74 → 48,76	0.007417	ΔRGB(20,17,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	64,74 → 64,76	0.007417	ΔRGB(22,19,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	71,74 → 72,76	0.007417	ΔRGB(-22,-18,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	80,74 → 80,76	0.007417	ΔRGB(39,33,6)	antialiasing coverage residue on a shared outline
AntialiasCoverage	87,74 → 88,76	0.007417	ΔRGB(-39,-32,-6)	antialiasing coverage residue on a shared outline
AntialiasCoverage	96,74 → 96,76	0.007417	ΔRGB(39,33,6)	antialiasing coverage residue on a shared outline
AntialiasCoverage	103,74 → 104,76	0.007417	ΔRGB(-39,-32,-6)	antialiasing coverage residue on a shared outline
AntialiasCoverage	112,74 → 112,76	0.007417	ΔRGB(49,41,8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	88,76 → 88,77	0.007417	ΔRGB(-30,-25,-5)	antialiasing coverage residue on a shared outline
AntialiasCoverage	104,76 → 104,77	0.007417	ΔRGB(-30,-25,-5)	antialiasing coverage residue on a shared outline
AntialiasCoverage	32,76 → 32,78	0.007417	ΔRGB(15,13,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	48,76 → 48,78	0.007417	ΔRGB(15,13,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	64,76 → 64,78	0.007417	ΔRGB(25,22,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	81,73 → 81,74	0.005298	ΔRGB(20,17,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	97,73 → 97,74	0.005298	ΔRGB(20,17,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	19,72 → 20,72	0.004238	ΔRGB(17,14,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	35,72 → 36,72	0.004238	ΔRGB(17,14,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	51,72 → 52,72	0.004238	ΔRGB(17,14,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	67,72 → 68,72	0.004238	ΔRGB(17,14,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	83,72 → 84,72	0.004238	ΔRGB(17,14,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	99,72 → 100,72	0.004238	ΔRGB(17,14,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	39,73 → 39,74	0.004238	ΔRGB(-13,-11,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	55,73 → 55,74	0.004238	ΔRGB(-13,-11,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	71,73 → 71,74	0.004238	ΔRGB(-22,-18,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	87,73 → 87,74	0.004238	ΔRGB(-22,-18,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	16,75 → 16,76	0.004238	ΔRGB(17,14,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	72,76 → 72,77	0.004238	ΔRGB(-29,-24,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	71,78 → 71,78	0.004238	ΔRGB(-22,-19,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	87,78 → 87,78	0.004238	ΔRGB(-22,-19,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	103,78 → 103,78	0.004238	ΔRGB(-22,-19,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	49,78 → 49,79	0.004238	ΔRGB(20,16,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	65,78 → 65,79	0.004238	ΔRGB(20,16,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	49,79 → 50,79	0.004238	ΔRGB(16,14,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	65,79 → 66,79	0.004238	ΔRGB(16,14,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	81,79 → 82,79	0.004238	ΔRGB(16,14,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	97,79 → 98,79	0.004238	ΔRGB(16,14,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	102,79 → 102,79	0.004238	ΔRGB(-22,-19,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	113,79 → 114,79	0.004238	ΔRGB(40,35,6)	antialiasing coverage residue on a shared outline
AntialiasCoverage	50,80 → 51,80	0.004238	ΔRGB(18,15,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	66,80 → 67,80	0.004238	ΔRGB(18,15,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	82,80 → 83,80	0.004238	ΔRGB(18,15,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	98,80 → 99,80	0.004238	ΔRGB(18,15,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	114,80 → 115,80	0.004238	ΔRGB(18,15,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	49,73 → 49,73	0.003179	ΔRGB(20,17,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	65,73 → 65,73	0.003179	ΔRGB(20,17,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	23,73 → 23,74	0.003179	ΔRGB(-20,-16,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	40,75 → 40,75	0.003179	ΔRGB(-17,-14,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	56,75 → 56,75	0.003179	ΔRGB(-17,-14,-2)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/border-style-four-value-shorthand.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>border style four value shorthand</title>
6<style>
7  @page { size: 184px 136px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 120px;
13    height: 80px;
14    margin: 25px;
15    border-width: 8px;
16    border-color: #111111;
17    border-style: solid dashed dotted double;
18    background: #fdd835;
19  }
20</style>
21</head>
22<body>
23  <div class="box"></div>
24</body>
25</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.42% · raw 0.44% (1481 px) border-style-3d-bevels · groove-ridge-inset-outsetPASS via CSS-scale observation: sub-CSS shared-outline coverageAntialiasCoverageextra 0.5%ΔE 6.6

why: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

groove, ridge, inset, and outset render with 3D bevel polarity; catches unsupported keywords collapsed to flat solid borders.

regions (17 total; showing 17 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	12	786	0,0 → 172,70	292	total 0.3% · largest 0.1%
Extra	5	695	16,0 → 156,70	219	total 0.3% · largest 0.10%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	140,0 → 156,54	0.1	ΔRGB(0,15,13)	antialiasing coverage residue on a shared outline
Extra	86,0 → 86,70	0.10		candidate adds paint absent from reference (0.10%)
AntialiasCoverage	94,8 → 102,62	0.10	ΔRGB(0,-11,-10)	antialiasing coverage residue on a shared outline
Extra	16,16 → 16,54	0.05		candidate adds paint absent from reference (0.05%)
Extra	54,16 → 54,54	0.05		candidate adds paint absent from reference (0.05%)
Extra	140,16 → 140,54	0.05		candidate adds paint absent from reference (0.05%)
Extra	156,16 → 156,54	0.05		candidate adds paint absent from reference (0.05%)
AntialiasCoverage	0,54 → 16,70	0.04	ΔRGB(0,1,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	62,0 → 70,8	0.02	ΔRGB(0,-20,-18)	antialiasing coverage residue on a shared outline
AntialiasCoverage	54,8 → 62,16	0.02	ΔRGB(0,20,18)	antialiasing coverage residue on a shared outline
AntialiasCoverage	86,62 → 93,70	0.02	ΔRGB(0,-35,-31)	antialiasing coverage residue on a shared outline
AntialiasCoverage	156,54 → 156,62	0.01	ΔRGB(89,-14,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	172,0 → 172,0	0.000445	ΔRGB(15,12,12)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,8 → 8,8	0.000445	ΔRGB(0,-6,-6)	antialiasing coverage residue on a shared outline
AntialiasCoverage	94,8 → 94,8	0.000445	ΔRGB(0,2,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	62,62 → 62,62	0.000445	ΔRGB(0,7,7)	antialiasing coverage residue on a shared outline
AntialiasCoverage	148,62 → 148,62	0.000445	ΔRGB(0,-19,-17)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/border-style-3d-bevels.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>border-style 3d bevels</title>
6<style>
7  @page { size: 360px 96px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .row {
12    width: 360px;
13    height: 90px;
14    padding: 10px;
15    font-size: 0;
16    background: #f5f5f5;
17  }
18  .box {
19    display: inline-block;
20    width: 70px;
21    height: 70px;
22    margin-right: 16px;
23    border-width: 16px;
24    border-color: #00897b;
25    background: #ffffff;
26  }
27  .box:last-child { margin-right: 0; }
28  .groove { border-style: groove; }
29  .ridge { border-style: ridge; }
30  .inset { border-style: inset; }
31  .outset { border-style: outset; }
32</style>
33</head>
34<body>
35  <div class="row">
36    <div class="box groove"></div>
37    <div class="box ridge"></div>
38    <div class="box inset"></div>
39    <div class="box outset"></div>
40  </div>
41</body>
42</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.05% · raw 0.05% (153 px) border-style-dashed · dashedPASS via CSS-scale observation: one-sided sub-CSS outline coverageExtraextra 0.2%ΔE 22.2

why: visually accepted coverage phase; raw candidate adds paint absent from reference (0.2%)

Box with a 6px dashed border.

regions (9 total; showing 9 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	7	115	6,0 → 113,120	19	total 0.05% · largest 0.008107%
Extra	2	38	125,0 → 125,120	19	total 0.02% · largest 0.008107%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
Extra	125,0 → 125,6	0.008107		candidate adds paint absent from reference (0.008107%)
Extra	125,114 → 125,120	0.008107		candidate adds paint absent from reference (0.008107%)
AntialiasCoverage	56,0 → 56,6	0.008107	ΔRGB(75,70,37)	antialiasing coverage residue on a shared outline
AntialiasCoverage	68,0 → 68,6	0.008107	ΔRGB(-75,-70,-37)	antialiasing coverage residue on a shared outline
AntialiasCoverage	113,0 → 113,6	0.008107	ΔRGB(64,60,32)	antialiasing coverage residue on a shared outline
AntialiasCoverage	56,114 → 56,120	0.008107	ΔRGB(75,70,37)	antialiasing coverage residue on a shared outline
AntialiasCoverage	68,114 → 68,120	0.008107	ΔRGB(-75,-70,-37)	antialiasing coverage residue on a shared outline
AntialiasCoverage	113,114 → 113,120	0.008107	ΔRGB(64,60,32)	antialiasing coverage residue on a shared outline
AntialiasCoverage	6,6 → 6,6	0.000427	ΔRGB(-6,-5,-2)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/border-style-dashed.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>border style dashed</title>
6<style>
7  @page { size: 280px 120px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 200px;
13    height: 120px;
14    background-color: #ffffff;
15    border: 6px dashed #283593;
16  }
17</style>
18</head>
19<body>
20  <div class="box"></div>
21</body>
22</html>

PASS exact match border-style-double · double

Box with a 10px double border (two solid rules separated by a gap).

PASS exact match border-style-none · none-no-paint

border-style none paints no border while reserving the declared width via longhands.

border-width — 100.00% verified visual parity PASS 1 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS exact match border-width-four-value-shorthand · four-value-shorthand

border-width four-value shorthand assigns visibly different widths to every side; catches uniform-width shorthand parsing.

box-shadow — 100.00% verified visual parity PASS 5 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS visually equivalent · no rejecting defect · thresholded evidence 0.04% · raw 0.04% (140 px) box-shadow-inset-elliptical-radius · inset-elliptical-radiusPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 30.0

why: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

An inset spread shadow follows an elliptical border-radius inner curve; catches rectangular or scalar-radius clipping.

regions (3 total; showing 3 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	3	140	13,18 → 164,69	138	total 0.09% · largest 0.09%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	164,26 → 164,69	0.09	ΔRGB(-10,-67,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	13,18 → 13,18	0.000633	ΔRGB(0,1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	156,18 → 156,18	0.000633	ΔRGB(1,4,0)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/box-shadow-inset-elliptical-radius.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>box shadow inset elliptical radius</title>
6<style>
7  @page { size: 224px 152px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 170px;
13    height: 95px;
14    margin: 25px;
15    background: #fdd835;
16    border: 6px solid #111111;
17    border-radius: 50% / 28%;
18    box-shadow: inset 0 0 0 18px #e53935;
19  }
20</style>
21</head>
22<body>
23  <div class="box"></div>
24</body>
25</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.002133% · raw 0.002133% (8 px) box-shadow-spread-nonuniform-radius · spread-nonuniform-radiusPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 2.2

why: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

A spread-only outer box-shadow preserves four unequal corner radii; catches scalar-radius shadow inflation.

regions (8 total; showing 8 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	8	8	1,1 → 195,125	1	total 0.003312% · largest 0.000414%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	185,1 → 185,1	0.000414	ΔRGB(-10,-5,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	195,11 → 195,11	0.000414	ΔRGB(-6,-4,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	1,104 → 1,104	0.000414	ΔRGB(-19,-10,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	3,109 → 3,109	0.000414	ΔRGB(-10,-5,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,117 → 8,117	0.000414	ΔRGB(-4,-2,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	9,118 → 9,118	0.000414	ΔRGB(-4,-2,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	17,123 → 17,123	0.000414	ΔRGB(-10,-5,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	21,125 → 21,125	0.000414	ΔRGB(-19,-10,-2)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/box-shadow-spread-nonuniform-radius.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>box shadow spread nonuniform radius</title>
6<style>
7  @page { size: 240px 160px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 160px;
13    height: 90px;
14    margin: 35px;
15    background: #fdd835;
16    border: 4px solid #111111;
17    border-radius: 42px 6px 30px 12px;
18    box-shadow: 0 0 0 18px #1e88e5;
19  }
20</style>
21</head>
22<body>
23  <div class="box"></div>
24</body>
25</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.001141% · raw 0.001141% (4 px) box-shadow-elliptical-radius · elliptical-percentage-radiusPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 4.0

why: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

A pill-shaped border-radius:50% casts a hard oval shadow; catches scalar rounded-rectangle shadow math on non-square boxes.

regions (4 total; showing 4 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	4	4	169,20 → 203,80	1	total 0.001901% · largest 0.000475%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	169,20 → 169,20	0.000475	ΔRGB(-12,-5,-6)	antialiasing coverage residue on a shared outline
AntialiasCoverage	203,41 → 203,41	0.000475	ΔRGB(-8,-12,-6)	antialiasing coverage residue on a shared outline
AntialiasCoverage	169,60 → 169,60	0.000475	ΔRGB(-6,14,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	203,80 → 203,80	0.000475	ΔRGB(-6,-9,-4)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/box-shadow-elliptical-radius.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>box-shadow elliptical radius</title>
6<style>
7  @page { size: 264px 136px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .stage {
12    width: 260px;
13    height: 130px;
14    padding: 15px 50px 35px 15px;
15    background: #ffffff;
16  }
17  .pill {
18    width: 180px;
19    height: 80px;
20    border-radius: 50%;
21    background: #26a69a;
22    box-shadow: 34px 20px 0 #6a1b9a;
23  }
24</style>
25</head>
26<body>
27  <div class="stage"><div class="pill"></div></div>
28</body>
29</html>

PASS exact match border-box-shadow-offset · hard-offset

Box with a hard-edged (zero-blur) offset box-shadow for deterministic diffing.

PASS exact match border-x-box-shadow · x-border

Combo: a hard offset box-shadow cast by a box that also has a solid border (same-category combination).

conic-gradient — 100.00% verified visual parity PASS 1 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS visually equivalent · no rejecting defect · thresholded evidence 0% · raw 0.000183% (1 px) background-conic-gradient · centerPASS via raw same-coordinate visibility policyAntialiasCoverageΔE 0.3

why: antialiasing coverage residue on a shared outline

Centered multi-stop conic-gradient background.

regions (1 total; showing 1 representative)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	1	1	14,111 → 14,111	1	total 0.000256% · largest 0.000256% · max ΔE 0.3

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	14,111 → 14,111	0.000256	ΔE 0.3 ΔRGB(0,1,0)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/background-conic-gradient.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>conic-gradient background</title>
6<style>
7  @page { size: 280px 200px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 200px;
13    height: 200px;
14    background: conic-gradient(#d50000, #2962ff, #00c853, #d50000);
15  }
16</style>
17</head>
18<body>
19  <div class="box"></div>
20</body>
21</html>

linear-gradient — 100.00% verified visual parity PASS 2 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS visually equivalent · no rejecting defect · thresholded evidence 0% · raw 0.000731% (4 px) background-linear-gradient-diagonal · 45deg-diagonalPASS via raw same-coordinate visibility policyAntialiasCoverageΔE 0.3

why: antialiasing coverage residue on a shared outline

Diagonal 45deg two-stop linear-gradient background on a square box.

regions (4 total; showing 4 representatives)

Complete component census grouped by dominant raster class; representative details are bounded.

Complete dominant-class aggregates

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	4	4	37,37 → 54,54	1	total 0.001024% · largest 0.000256% · max ΔE 0.3

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	37,37 → 37,37	0.000256	ΔE 0.3 ΔRGB(1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	40,40 → 40,40	0.000256	ΔE 0.3 ΔRGB(-1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	46,46 → 46,46	0.000256	ΔE 0.3 ΔRGB(-1,0,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	54,54 → 54,54	0.000256	ΔE 0.3 ΔRGB(-1,0,0)	antialiasing coverage residue on a shared outline

source · cases/backgrounds-borders/background-linear-gradient-diagonal.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>background linear-gradient diagonal 45deg</title>
6<style>
7  @page { size: 280px 200px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .box {
12    width: 200px;
13    height: 200px;
14    background-image: linear-gradient(45deg, #004d40, #ffd54f);
15  }
16</style>
17</head>
18<body>
19  <div class="box"></div>
20</body>
21</html>

PASS exact match background-linear-gradient · to-right

Horizontal two-stop linear-gradient background.

outline — 100.00% verified visual parity PASS 2 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS exact match outline-offset-negative · negative-offset

outline-offset negative pulls the outline inward over the box.

PASS exact match outline-solid · solid-offset

Square-corner outline with a positive offset. Exact outline geometry is user-agent-defined; this fixture is a Chromium compatibility canary.

radial-gradient — 100.00% verified visual parity PASS 2 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS exact match background-radial-gradient · circle-center

Centered circular two-stop radial-gradient background on a square box.

PASS exact match background-radial-gradient-ellipse · ellipse-farthest-corner

Elliptical radial-gradient sized to the farthest corner.

root-body-canvas-background-precedence — 100.00% verified visual parity PASS 1 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS exact match html-background-suppresses-body-canvas · root-suppresses-body-propagation

An html background paints the canvas and prevents body background propagation; catches engines that fill the whole page with the body color.