parity · overflow-clipping

REFERENCE-DISPUTED 2554 px · above-floor 0.44% · raw 0.47% max-page diff overflow-scroll-print-clip · scroll · REFERENCE DISPUTEDMissingmissing 0.6%extra 0.5%ΔE 0.2

why: candidate lacks paint present in reference (0.6%)

overflow:scroll establishes a scroll container. In static print media, the exact overflow indicator and placement of printed overflow are UA-defined, so the Chrome PDF is retained only as a compatibility canary.

reference dispute: CSS Overflow 3 section 3.1.3 allows static-media UAs to show an overflow indication and says overflowing scroll content may be printed without defining where; Chrome's exact scrollbar and clipping pixels are not a normative oracle.

regions (266 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	27	984	3,3 → 154,114	744	total 0.5% · largest 0.4%
Extra	52	809	8,6 → 154,114	158	total 0.4% · largest 0.08%
ColorErr	187	761	8,6 → 154,116	152	total 0.4% · largest 0.08% · max ΔE 0.2

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
Missing	3,3 → 142,102	0.4		candidate lacks paint present in reference (0.4%)
Extra	24,114 → 75,114	0.08		candidate adds paint absent from reference (0.08%)
AntialiasCoverage	25,104 → 73,105	0.08	ΔRGB(-98,-98,-98)	antialiasing coverage residue on a shared outline
Extra	26,104 → 73,104	0.08		candidate adds paint absent from reference (0.08%)
Extra	146,92 → 153,98	0.08		candidate adds paint absent from reference (0.08%)
Extra	147,6 → 151,11	0.04		candidate adds paint absent from reference (0.04%)
Extra	154,24 → 154,49	0.04		candidate adds paint absent from reference (0.04%)
AntialiasCoverage	144,25 → 145,47	0.04	ΔRGB(-98,-98,-98)	antialiasing coverage residue on a shared outline
Extra	144,26 → 144,47	0.04		candidate adds paint absent from reference (0.04%)
ColorValue	21,102 → 21,116	0.03	ΔE 0.2 ΔRGB(-1,-1,-1)	fill recolour ΔRGB(-1,-1,-1) (ΔE 0.2)
Extra	145,14 → 153,14	0.03		candidate adds paint absent from reference (0.03%)
Missing	9,105 → 13,108	0.02		candidate lacks paint present in reference (0.02%)
ColorValue	142,102 → 142,116	0.02	ΔE 0.2 ΔRGB(-1,-1,-1)	fill recolour ΔRGB(-1,-1,-1) (ΔE 0.2)
Missing	9,110 → 13,114	0.02		candidate lacks paint present in reference (0.02%)
Missing	131,105 → 134,108	0.02		candidate lacks paint present in reference (0.02%)
Missing	131,111 → 134,114	0.02		candidate lacks paint present in reference (0.02%)
AntialiasCoverage	145,90 → 153,91	0.02	ΔRGB(98,98,98)	antialiasing coverage residue on a shared outline
Missing	145,90 → 154,90	0.02		candidate lacks paint present in reference (0.02%)
AntialiasCoverage	145,13 → 153,14	0.01	ΔRGB(-73,-73,-73)	antialiasing coverage residue on a shared outline
AntialiasCoverage	12,107 → 13,112	0.01	ΔRGB(-73,-73,-73)	antialiasing coverage residue on a shared outline
AntialiasCoverage	131,107 → 132,112	0.01	ΔRGB(39,39,39)	antialiasing coverage residue on a shared outline
AntialiasCoverage	148,21 → 150,21	0.005333	ΔRGB(39,39,39)	antialiasing coverage residue on a shared outline
Missing	153,13 → 154,14	0.003733		candidate lacks paint present in reference (0.003733%)
AntialiasCoverage	152,91 → 153,92	0.003733	ΔRGB(-20,-20,-20)	antialiasing coverage residue on a shared outline
AntialiasCoverage	149,94 → 150,95	0.003733	ΔRGB(-86,-86,-86)	antialiasing coverage residue on a shared outline
Missing	148,21 → 150,21	0.003200		candidate lacks paint present in reference (0.003200%)
Missing	21,108 → 21,110	0.003200		candidate lacks paint present in reference (0.003200%)
AntialiasCoverage	147,11 → 147,12	0.003200	ΔRGB(-20,-20,-20)	antialiasing coverage residue on a shared outline
AntialiasCoverage	152,22 → 153,22	0.003200	ΔRGB(39,39,39)	antialiasing coverage residue on a shared outline
AntialiasCoverage	78,108 → 78,110	0.003200	ΔRGB(-73,-73,-73)	antialiasing coverage residue on a shared outline
AntialiasCoverage	135,109 → 136,110	0.003200	ΔRGB(-13,-13,-13)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,109 → 9,110	0.003200	ΔRGB(9,9,9)	antialiasing coverage residue on a shared outline
AntialiasCoverage	22,112 → 22,113	0.003200	ΔRGB(39,39,39)	antialiasing coverage residue on a shared outline
AntialiasCoverage	145,24 → 145,25	0.002667	ΔRGB(-25,-25,-25)	antialiasing coverage residue on a shared outline
AntialiasCoverage	145,48 → 145,49	0.002667	ΔRGB(-57,-57,-57)	antialiasing coverage residue on a shared outline
AntialiasCoverage	150,52 → 151,52	0.002667	ΔRGB(-48,-48,-48)	antialiasing coverage residue on a shared outline
AntialiasCoverage	24,105 → 25,105	0.002667	ΔRGB(-25,-25,-25)	antialiasing coverage residue on a shared outline
AntialiasCoverage	74,105 → 75,105	0.002667	ΔRGB(-48,-48,-48)	antialiasing coverage residue on a shared outline
AntialiasCoverage	76,106 → 77,106	0.002667	ΔRGB(-20,-20,-20)	antialiasing coverage residue on a shared outline
Missing	145,13 → 145,14	0.002133		candidate lacks paint present in reference (0.002133%)
Extra	145,48 → 145,49	0.002133		candidate adds paint absent from reference (0.002133%)
Extra	148,52 → 149,52	0.002133		candidate adds paint absent from reference (0.002133%)
Extra	74,105 → 75,105	0.002133		candidate adds paint absent from reference (0.002133%)
Extra	78,109 → 78,110	0.002133		candidate adds paint absent from reference (0.002133%)
Extra	78,110 → 78,111	0.002133		candidate adds paint absent from reference (0.002133%)
AntialiasCoverage	151,11 → 151,11	0.002133	ΔRGB(-10,-10,-10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	146,12 → 146,13	0.002133	ΔRGB(39,39,39)	antialiasing coverage residue on a shared outline
AntialiasCoverage	146,22 → 147,22	0.002133	ΔRGB(59,59,59)	antialiasing coverage residue on a shared outline
AntialiasCoverage	153,23 → 153,23	0.002133	ΔRGB(-10,-10,-10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	154,24 → 154,25	0.002133	ΔRGB(-39,-39,-39)	antialiasing coverage residue on a shared outline
AntialiasCoverage	154,48 → 154,49	0.002133	ΔRGB(-48,-48,-48)	antialiasing coverage residue on a shared outline
AntialiasCoverage	148,52 → 148,52	0.002133	ΔRGB(-39,-39,-39)	antialiasing coverage residue on a shared outline
AntialiasCoverage	148,93 → 148,94	0.002133	ΔRGB(-10,-10,-10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	22,106 → 22,107	0.002133	ΔRGB(59,59,59)	antialiasing coverage residue on a shared outline
AntialiasCoverage	134,110 → 135,110	0.002133	ΔRGB(10,10,10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	23,113 → 23,113	0.002133	ΔRGB(-10,-10,-10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	24,114 → 25,114	0.002133	ΔRGB(-39,-39,-39)	antialiasing coverage residue on a shared outline
AntialiasCoverage	74,114 → 75,114	0.002133	ΔRGB(-39,-39,-39)	antialiasing coverage residue on a shared outline
Extra	145,24 → 145,25	0.001600		candidate adds paint absent from reference (0.001600%)
Extra	150,52 → 150,52	0.001600		candidate adds paint absent from reference (0.001600%)
Extra	24,105 → 25,105	0.001600		candidate adds paint absent from reference (0.001600%)
Extra	78,108 → 78,108	0.001600		candidate adds paint absent from reference (0.001600%)
AntialiasCoverage	152,12 → 152,12	0.001600	ΔRGB(-3,-3,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	147,21 → 148,21	0.001600	ΔRGB(30,30,30)	antialiasing coverage residue on a shared outline

source · cases/overflow-clipping/overflow-scroll-print-clip.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>overflow scroll in print</title>
6<style>
7  @page { size: 304px 184px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .wrap { padding: 30px; }
12  /* In print, CSS Overflow permits a scroll-overflow indication and leaves
13     printed overflow placement undefined. This is a Chrome compatibility
14     canary, not a normative assertion about scrollbar pixels or clipping. */
15  .clip {
16    overflow: scroll;
17    width: 160px;
18    height: 120px;
19    background: #fdf2e9;
20    border: 3px solid #7e5109;
21  }
22  .child {
23    width: 250px;
24    height: 200px;
25    background: #ca6f1e;
26  }
27</style>
28</head>
29<body>
30  <div class="wrap">
31    <div class="clip">
32      <div class="child"></div>
33    </div>
34  </div>
35</body>
36</html>

REFERENCE-DISPUTED 888 px · above-floor 0.30% · raw 0.34% max-page diff overflow-axis-visible-hidden-coercion · visible-hidden-axis-coercion · REFERENCE DISPUTEDMissingmissing 0.3%extra 0.3%ΔE 0.2

why: candidate lacks paint present in reference (0.3%)

overflow-x:visible plus overflow-y:hidden coerces the x axis to non-visible clipping; catches preserving visible overflow on the x axis.

reference dispute: CSS Overflow 3 section 3.1 makes visible compute to auto when the other axis is scrollable, which Ironpress implements. In print, auto inherits scroll's undefined overflow placement, so Chrome's scrollbar geometry and clipping pixels are a compatibility canary, not a normative oracle.

regions (115 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	81	550	4,0 → 80,80	250	total 0.9% · largest 0.4% · max ΔE 0.2
Extra	19	159	10,68 → 74,77	61	total 0.3% · largest 0.10%
Missing	15	179	5,68 → 73,77	43	total 0.3% · largest 0.07%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	80,0 → 80,80	0.4	ΔE 0.2 ΔRGB(-4,-4,-5)	antialiasing coverage residue on a shared outline
Extra	22,68 → 41,68	0.10		candidate adds paint absent from reference (0.10%)
AntialiasCoverage	22,77 → 41,77	0.10	ΔRGB(-73,-73,-73)	antialiasing coverage residue on a shared outline
Extra	22,77 → 41,77	0.09		candidate adds paint absent from reference (0.09%)
ColorValue	62,65 → 62,80	0.08	ΔE 0.2 ΔRGB(-1,-1,-1)	fill recolour ΔRGB(-1,-1,-1) (ΔE 0.2)
Missing	6,73 → 10,76	0.07		candidate lacks paint present in reference (0.07%)
Missing	6,68 → 10,71	0.07		candidate lacks paint present in reference (0.07%)
Missing	69,74 → 72,77	0.06		candidate lacks paint present in reference (0.06%)
Missing	69,68 → 72,71	0.06		candidate lacks paint present in reference (0.06%)
AntialiasCoverage	69,70 → 69,75	0.03	ΔRGB(34,34,34)	antialiasing coverage residue on a shared outline
Extra	10,70 → 10,75	0.03		candidate adds paint absent from reference (0.03%)
AntialiasCoverage	43,68 → 44,70	0.01	ΔRGB(-10,-10,-10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,71 → 6,72	0.01	ΔRGB(2,2,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	19,69 → 20,70	0.009600	ΔRGB(18,18,18)	antialiasing coverage residue on a shared outline
AntialiasCoverage	72,71 → 73,72	0.009600	ΔRGB(10,10,10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	21,68 → 22,68	0.008000	ΔRGB(-65,-65,-65)	antialiasing coverage residue on a shared outline
AntialiasCoverage	40,68 → 41,68	0.008000	ΔRGB(-48,-48,-48)	antialiasing coverage residue on a shared outline
Missing	18,71 → 18,72	0.006400		candidate lacks paint present in reference (0.006400%)
Missing	18,73 → 18,74	0.006400		candidate lacks paint present in reference (0.006400%)
AntialiasCoverage	20,68 → 20,68	0.006400	ΔRGB(-10,-10,-10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	18,71 → 18,71	0.006400	ΔRGB(48,48,48)	antialiasing coverage residue on a shared outline
AntialiasCoverage	18,73 → 18,74	0.006400	ΔRGB(65,65,65)	antialiasing coverage residue on a shared outline
AntialiasCoverage	44,73 → 45,74	0.006400	ΔRGB(-16,-16,-16)	antialiasing coverage residue on a shared outline
AntialiasCoverage	44,74 → 44,75	0.006400	ΔRGB(-10,-10,-10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	20,76 → 21,77	0.006400	ΔRGB(-13,-13,-13)	antialiasing coverage residue on a shared outline
AntialiasCoverage	41,76 → 42,77	0.006400	ΔRGB(-20,-20,-20)	antialiasing coverage residue on a shared outline
Extra	74,72 → 74,72	0.004800		candidate adds paint absent from reference (0.004800%)
Extra	41,77 → 42,77	0.004800		candidate adds paint absent from reference (0.004800%)
AntialiasCoverage	42,68 → 42,68	0.004800	ΔRGB(-20,-20,-20)	antialiasing coverage residue on a shared outline
AntialiasCoverage	18,70 → 19,70	0.004800	ΔRGB(10,10,10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	44,70 → 44,71	0.004800	ΔRGB(-17,-17,-17)	antialiasing coverage residue on a shared outline
AntialiasCoverage	73,73 → 73,73	0.004800	ΔRGB(10,10,10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	18,74 → 19,75	0.004800	ΔRGB(20,20,20)	antialiasing coverage residue on a shared outline
AntialiasCoverage	19,75 → 19,76	0.004800	ΔRGB(10,10,10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	43,75 → 44,76	0.004800	ΔRGB(-10,-10,-10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	42,76 → 43,76	0.004800	ΔRGB(-10,-10,-10)	antialiasing coverage residue on a shared outline
Extra	42,68 → 42,68	0.003200		candidate adds paint absent from reference (0.003200%)
Extra	21,77 → 21,77	0.003200		candidate adds paint absent from reference (0.003200%)
AntialiasCoverage	9,70 → 10,70	0.003200	ΔRGB(98,98,98)	antialiasing coverage residue on a shared outline
AntialiasCoverage	9,70 → 9,70	0.003200	ΔRGB(98,98,98)	antialiasing coverage residue on a shared outline
AntialiasCoverage	70,70 → 70,70	0.003200	ΔRGB(86,86,86)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,70 → 8,70	0.003200	ΔRGB(98,98,98)	antialiasing coverage residue on a shared outline
AntialiasCoverage	70,70 → 71,70	0.003200	ΔRGB(86,86,86)	antialiasing coverage residue on a shared outline
AntialiasCoverage	7,71 → 8,71	0.003200	ΔRGB(98,98,98)	antialiasing coverage residue on a shared outline
AntialiasCoverage	71,71 → 71,71	0.003200	ΔRGB(86,86,86)	antialiasing coverage residue on a shared outline
AntialiasCoverage	7,71 → 7,71	0.003200	ΔRGB(98,98,98)	antialiasing coverage residue on a shared outline
AntialiasCoverage	72,71 → 72,71	0.003200	ΔRGB(86,86,86)	antialiasing coverage residue on a shared outline
AntialiasCoverage	6,71 → 6,71	0.003200	ΔRGB(98,98,98)	antialiasing coverage residue on a shared outline
AntialiasCoverage	45,72 → 45,72	0.003200	ΔRGB(-10,-10,-10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	74,72 → 74,72	0.003200	ΔRGB(-10,-10,-10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	18,72 → 18,72	0.003200	ΔRGB(98,98,98)	antialiasing coverage residue on a shared outline
AntialiasCoverage	5,73 → 5,73	0.003200	ΔRGB(29,29,29)	antialiasing coverage residue on a shared outline
AntialiasCoverage	6,73 → 6,73	0.003200	ΔRGB(86,86,86)	antialiasing coverage residue on a shared outline
AntialiasCoverage	6,73 → 7,73	0.003200	ΔRGB(86,86,86)	antialiasing coverage residue on a shared outline
AntialiasCoverage	72,73 → 72,73	0.003200	ΔRGB(73,73,73)	antialiasing coverage residue on a shared outline
AntialiasCoverage	7,74 → 7,74	0.003200	ΔRGB(86,86,86)	antialiasing coverage residue on a shared outline
AntialiasCoverage	71,74 → 72,74	0.003200	ΔRGB(73,73,73)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,74 → 8,74	0.003200	ΔRGB(86,86,86)	antialiasing coverage residue on a shared outline
AntialiasCoverage	71,74 → 71,74	0.003200	ΔRGB(73,73,73)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,74 → 9,74	0.003200	ΔRGB(86,86,86)	antialiasing coverage residue on a shared outline
AntialiasCoverage	70,74 → 70,74	0.003200	ΔRGB(73,73,73)	antialiasing coverage residue on a shared outline
AntialiasCoverage	9,75 → 9,75	0.003200	ΔRGB(86,86,86)	antialiasing coverage residue on a shared outline
AntialiasCoverage	69,75 → 70,75	0.003200	ΔRGB(73,73,73)	antialiasing coverage residue on a shared outline
AntialiasCoverage	20,76 → 20,76	0.003200	ΔRGB(-5,-5,-5)	antialiasing coverage residue on a shared outline

source · cases/overflow-clipping/overflow-axis-visible-hidden-coercion.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<style>
6  @page { size: 184px 144px; margin: 0; }
7  html { font-family: ParitySans; line-height: 1.5; }
8  * { margin: 0; box-sizing: border-box; }
9  html, body { background: #ffffff; }
10  body { padding: 30px; }
11  .box {
12    width: 80px;
13    height: 80px;
14    overflow-x: visible;
15    overflow-y: hidden;
16    background: #d9d9d9;
17  }
18  .child {
19    width: 130px;
20    height: 130px;
21    background: #0a7f2e;
22  }
23</style>
24</head>
25<body>
26  <div class="box"><div class="child"></div></div>
27</body>
28</html>

REFERENCE-DISPUTED 1203 px · above-floor 0.23% · raw 0.23% max-page diff overflow-x-y-separate · overflow-x-overflow-y · REFERENCE DISPUTEDExtramissing 0.2%extra 0.3%ΔE 17.3

why: candidate adds paint absent from reference (0.3%)

overflow-x:hidden makes the visible y value compute to auto, so both axes constrain the oversized child. Catches renderers that retain visible y overflow instead of applying the CSS Overflow axis-coercion rule.

reference dispute: CSS Overflow 3 section 3.1 makes visible compute to auto when the other axis is scrollable, which Ironpress implements. In static media, section 3.1.3 permits a UA overflow indication and section 5.1 leaves its appearance, size, and edge UA-defined; Chrome's scrollbar pixels are a compatibility canary, not a normative oracle.

regions (123 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	12	381	142,3 → 154,107	325	total 0.2% · largest 0.2%
Extra	28	517	144,6 → 154,103	161	total 0.3% · largest 0.09%
ColorErr	83	305	142,6 → 154,107	91	total 0.2% · largest 0.05%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
Missing	142,3 → 142,107	0.2		candidate lacks paint present in reference (0.2%)
Extra	146,96 → 153,103	0.09		candidate adds paint absent from reference (0.09%)
Extra	154,24 → 154,54	0.06		candidate adds paint absent from reference (0.06%)
AntialiasCoverage	144,25 → 145,53	0.05	ΔRGB(-98,-98,-98)	antialiasing coverage residue on a shared outline
Extra	144,26 → 144,53	0.05		candidate adds paint absent from reference (0.05%)
Extra	147,6 → 151,11	0.05		candidate adds paint absent from reference (0.05%)
Extra	145,14 → 153,14	0.03		candidate adds paint absent from reference (0.03%)
Missing	145,95 → 154,95	0.02		candidate lacks paint present in reference (0.02%)
AntialiasCoverage	145,13 → 153,14	0.02	ΔRGB(-73,-73,-73)	antialiasing coverage residue on a shared outline
AntialiasCoverage	145,95 → 153,95	0.02	ΔRGB(73,73,73)	antialiasing coverage residue on a shared outline
AntialiasCoverage	148,21 → 150,21	0.005831	ΔRGB(39,39,39)	antialiasing coverage residue on a shared outline
Extra	148,58 → 150,58	0.004665		candidate adds paint absent from reference (0.004665%)
Missing	153,13 → 154,14	0.004082		candidate lacks paint present in reference (0.004082%)
Missing	148,21 → 150,21	0.003499		candidate lacks paint present in reference (0.003499%)
AntialiasCoverage	147,11 → 147,12	0.003499	ΔRGB(-20,-20,-20)	antialiasing coverage residue on a shared outline
AntialiasCoverage	152,22 → 153,22	0.003499	ΔRGB(39,39,39)	antialiasing coverage residue on a shared outline
AntialiasCoverage	146,96 → 147,97	0.003499	ΔRGB(-20,-20,-20)	antialiasing coverage residue on a shared outline
AntialiasCoverage	151,97 → 152,98	0.003499	ΔRGB(-30,-30,-30)	antialiasing coverage residue on a shared outline
AntialiasCoverage	145,24 → 145,25	0.002915	ΔRGB(-25,-25,-25)	antialiasing coverage residue on a shared outline
AntialiasCoverage	154,54 → 154,55	0.002915	ΔRGB(-57,-57,-57)	antialiasing coverage residue on a shared outline
AntialiasCoverage	148,58 → 149,58	0.002915	ΔRGB(-48,-48,-48)	antialiasing coverage residue on a shared outline
Missing	145,13 → 145,14	0.002332		candidate lacks paint present in reference (0.002332%)
Extra	145,54 → 145,55	0.002332		candidate adds paint absent from reference (0.002332%)
AntialiasCoverage	151,11 → 151,11	0.002332	ΔRGB(-10,-10,-10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	146,12 → 146,13	0.002332	ΔRGB(39,39,39)	antialiasing coverage residue on a shared outline
AntialiasCoverage	146,22 → 147,22	0.002332	ΔRGB(59,59,59)	antialiasing coverage residue on a shared outline
AntialiasCoverage	153,23 → 153,23	0.002332	ΔRGB(-10,-10,-10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	154,24 → 154,25	0.002332	ΔRGB(-39,-39,-39)	antialiasing coverage residue on a shared outline
AntialiasCoverage	150,58 → 151,58	0.002332	ΔRGB(-57,-57,-57)	antialiasing coverage residue on a shared outline
Extra	145,24 → 145,25	0.001749		candidate adds paint absent from reference (0.001749%)
AntialiasCoverage	152,12 → 152,12	0.001749	ΔRGB(-3,-3,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	147,21 → 148,21	0.001749	ΔRGB(30,30,30)	antialiasing coverage residue on a shared outline
AntialiasCoverage	151,21 → 151,21	0.001749	ΔRGB(30,30,30)	antialiasing coverage residue on a shared outline
AntialiasCoverage	145,54 → 145,55	0.001749	ΔRGB(-65,-65,-65)	antialiasing coverage residue on a shared outline
Missing	148,21 → 148,21	0.001166		candidate lacks paint present in reference (0.001166%)
Missing	151,21 → 151,21	0.001166		candidate lacks paint present in reference (0.001166%)
Extra	152,11 → 152,11	0.001166		candidate adds paint absent from reference (0.001166%)
Extra	145,55 → 145,55	0.001166		candidate adds paint absent from reference (0.001166%)
Extra	154,55 → 154,55	0.001166		candidate adds paint absent from reference (0.001166%)
Extra	145,56 → 145,56	0.001166		candidate adds paint absent from reference (0.001166%)
Extra	153,56 → 153,56	0.001166		candidate adds paint absent from reference (0.001166%)
Extra	146,57 → 147,57	0.001166		candidate adds paint absent from reference (0.001166%)
Extra	152,57 → 152,57	0.001166		candidate adds paint absent from reference (0.001166%)
Extra	147,58 → 148,58	0.001166		candidate adds paint absent from reference (0.001166%)
Extra	151,58 → 151,58	0.001166		candidate adds paint absent from reference (0.001166%)
AntialiasCoverage	149,9 → 149,9	0.001166	ΔRGB(-30,-30,-30)	antialiasing coverage residue on a shared outline
AntialiasCoverage	146,22 → 146,22	0.001166	ΔRGB(37,37,37)	antialiasing coverage residue on a shared outline
AntialiasCoverage	145,23 → 145,23	0.001166	ΔRGB(-10,-10,-10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	153,55 → 153,55	0.001166	ΔRGB(-10,-10,-10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	146,56 → 146,56	0.001166	ΔRGB(-30,-30,-30)	antialiasing coverage residue on a shared outline
AntialiasCoverage	153,56 → 153,56	0.001166	ΔRGB(-10,-10,-10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	146,57 → 147,57	0.001166	ΔRGB(-10,-10,-10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	152,57 → 152,57	0.001166	ΔRGB(-10,-10,-10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	147,57 → 148,57	0.001166	ΔRGB(-10,-10,-10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	151,57 → 151,57	0.001166	ΔRGB(-10,-10,-10)	antialiasing coverage residue on a shared outline
ColorValue	149,100 → 149,100	0.001166	ΔRGB(-20,-20,-20)	fill recolour ΔRGB(-20,-20,-20) (ΔE 0)
Missing	153,12 → 153,12	0.000583		candidate lacks paint present in reference (0.000583%)
Missing	146,13 → 146,13	0.000583		candidate lacks paint present in reference (0.000583%)
Missing	147,21 → 147,21	0.000583		candidate lacks paint present in reference (0.000583%)
Missing	152,21 → 152,21	0.000583		candidate lacks paint present in reference (0.000583%)
Missing	146,22 → 146,22	0.000583		candidate lacks paint present in reference (0.000583%)
Extra	147,11 → 147,11	0.000583		candidate adds paint absent from reference (0.000583%)
Extra	152,12 → 152,12	0.000583		candidate adds paint absent from reference (0.000583%)
Extra	146,12 → 146,12	0.000583		candidate adds paint absent from reference (0.000583%)

source · cases/overflow-clipping/overflow-x-y-separate.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>overflow-x and overflow-y separate</title>
6<style>
7  @page { size: 304px 176px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .wrap { padding: 30px; }
12  /* Because hidden is a scrollable overflow value, the visible y value
13     computes to auto. Both axes therefore constrain the child. */
14  .clip {
15    overflow-x: hidden;
16    overflow-y: visible;
17    width: 160px;
18    height: 110px;
19    background: #eafaf1;
20    border: 3px solid #145a32;
21  }
22  .child {
23    width: 250px;
24    height: 190px;
25    background: #229954;
26  }
27</style>
28</head>
29<body>
30  <div class="wrap">
31    <div class="clip">
32      <div class="child"></div>
33    </div>
34  </div>
35</body>
36</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.13% · raw 0.16% (914 px) overflow-hidden-border-radius · hidden-with-border-radiusPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 0.9

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

overflow:hidden combined with border-radius clips the overflowing child to the rounded corners of the clip box.

regions (183 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	914	3,3 → 167,127	372	total 0.4% · largest 0.2%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	26,127 → 144,127	0.2	ΔRGB(0,-3,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	167,26 → 167,104	0.1	ΔRGB(0,-3,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	25,3 → 27,3	0.002771	ΔRGB(0,-3,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	3,25 → 3,27	0.002771	ΔRGB(0,-3,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	144,3 → 145,3	0.002309	ΔRGB(0,-3,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	3,104 → 3,105	0.002309	ΔRGB(0,-3,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	146,4 → 147,4	0.001847	ΔRGB(0,-2,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	167,23 → 167,24	0.001847	ΔRGB(0,-3,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,106 → 4,107	0.001847	ΔRGB(0,-2,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	23,127 → 24,127	0.001847	ΔRGB(0,-3,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	23,4 → 24,4	0.001386	ΔRGB(0,-3,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	148,4 → 148,4	0.001386	ΔRGB(0,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	166,21 → 166,21	0.001386	ΔRGB(0,-2,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	166,22 → 166,23	0.001386	ΔRGB(-1,-3,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,23 → 4,24	0.001386	ΔRGB(0,-3,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	167,106 → 167,107	0.001386	ΔRGB(0,-4,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	166,108 → 166,108	0.001386	ΔRGB(0,-3,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,108 → 4,108	0.001386	ΔRGB(0,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	21,126 → 21,126	0.001386	ΔRGB(0,-2,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	22,126 → 23,126	0.001386	ΔRGB(-1,-3,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	148,126 → 148,126	0.001386	ΔRGB(0,-3,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	146,127 → 147,127	0.001386	ΔRGB(0,-4,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	22,4 → 22,4	0.000924	ΔRGB(-1,-3,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	21,4 → 21,4	0.000924	ΔRGB(0,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	149,4 → 149,4	0.000924	ΔRGB(0,-3,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	20,4 → 20,4	0.000924	ΔRGB(0,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	150,4 → 150,4	0.000924	ΔRGB(0,-3,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	19,5 → 19,5	0.000924	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	151,5 → 151,5	0.000924	ΔRGB(0,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	17,5 → 18,5	0.000924	ΔRGB(0,-2,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	17,6 → 17,6	0.000924	ΔRGB(0,-2,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	16,6 → 16,6	0.000924	ΔRGB(0,-2,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	155,7 → 155,7	0.000924	ΔRGB(0,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	14,7 → 15,7	0.000924	ΔRGB(0,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	157,8 → 157,8	0.000924	ΔRGB(0,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	158,9 → 159,9	0.000924	ΔRGB(0,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	162,13 → 162,13	0.000924	ΔRGB(0,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	163,14 → 163,14	0.000924	ΔRGB(0,-1,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	7,14 → 7,15	0.000924	ΔRGB(0,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	164,15 → 164,15	0.000924	ΔRGB(0,-2,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	164,16 → 164,16	0.000924	ΔRGB(0,-1,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	6,16 → 6,16	0.000924	ΔRGB(0,-2,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	6,17 → 6,17	0.000924	ΔRGB(0,-2,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	5,17 → 5,18	0.000924	ΔRGB(0,-2,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	165,18 → 165,18	0.000924	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	165,18 → 165,19	0.000924	ΔRGB(0,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	5,19 → 5,19	0.000924	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,20 → 4,20	0.000924	ΔRGB(0,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	166,20 → 166,20	0.000924	ΔRGB(0,-2,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,21 → 4,21	0.000924	ΔRGB(0,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,22 → 4,22	0.000924	ΔRGB(-1,-3,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	166,109 → 166,109	0.000924	ΔRGB(0,-3,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,109 → 4,109	0.000924	ΔRGB(0,-3,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	166,110 → 166,110	0.000924	ΔRGB(0,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,110 → 4,110	0.000924	ΔRGB(0,-3,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	165,111 → 165,111	0.000924	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	5,111 → 5,111	0.000924	ΔRGB(0,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	165,112 → 165,112	0.000924	ΔRGB(0,-2,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	165,112 → 165,113	0.000924	ΔRGB(0,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	164,113 → 164,113	0.000924	ΔRGB(0,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	164,114 → 164,114	0.000924	ΔRGB(0,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	164,114 → 164,115	0.000924	ΔRGB(0,-2,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	7,115 → 7,115	0.000924	ΔRGB(0,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,117 → 8,117	0.000924	ΔRGB(0,-1,-1)	antialiasing coverage residue on a shared outline

source · cases/overflow-clipping/overflow-hidden-border-radius.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>overflow hidden with border-radius</title>
6<style>
7  @page { size: 312px 192px; margin: 0; }
8  html { font-family: ParitySans; line-height: 1.5; }
9  * { margin: 0; box-sizing: border-box; }
10  html, body { background: #ffffff; }
11  .wrap { padding: 30px; }
12  /* overflow:hidden combined with border-radius clips the overflowing
13     child to the rounded corners of the clip box. */
14  .clip {
15    overflow: hidden;
16    border-radius: 28px;
17    width: 170px;
18    height: 130px;
19    background: #fdedec;
20    border: 3px solid #7b241c;
21  }
22  .child {
23    width: 260px;
24    height: 210px;
25    background: #c0392b;
26  }
27</style>
28</head>
29<body>
30  <div class="wrap">
31    <div class="clip">
32      <div class="child"></div>
33    </div>
34  </div>
35</body>
36</html>

PASS exact match overflow-clip · clip

overflow:clip clips the oversized child to the clip box with no scroll container (modern clip keyword).

PASS exact match overflow-clip-float-no-bfc · clip-no-float-containment

overflow:clip clips overflow but does not establish a new formatting context, so a following red block is not pushed below the float; catches treating clip like hidden for BFC creation.

PASS exact match overflow-hidden-clip · hidden

overflow:hidden clips an oversized in-flow child to the clip box; the child is cut off at the right and bottom edges.

PASS exact match overflow-hidden-flex-item · hidden-on-flex-item

A flex item with overflow:hidden clips its oversized inner block to the flex item box while the sibling item is unaffected.

PASS exact match overflow-hidden-grid-item · hidden-on-grid-item

A grid cell with overflow:hidden clips its oversized inner block to the cell box while the sibling cell is unaffected.

PASS exact match overflow-hidden-nested · nested-clip-intersection

Nested overflow:hidden boxes; the visible region is the intersection of the outer and inner clip rectangles, with the grandchild clipped by both.

PASS exact match overflow-hidden-text-clip · hidden-clips-text

overflow:hidden on a short fixed-height box clips overflowing text lines below the box edge (bundled ParitySans).

PASS exact match overflow-invalid-value-preserves-hidden · invalid-declaration-discard

A later invalid overflow value is discarded, so the earlier overflow:hidden still clips oversized painted content on both axes.

PASS exact match overflow-logical-inline-clip · logical-inline-block-axes

overflow-inline:clip and overflow-block:visible clip only inline-axis overflow in horizontal writing mode; catches ignoring logical overflow or clipping both axes.

PASS exact match overflow-padding-box-clip · padding-box-clip-edge

overflow:hidden on a padded box clips its oversized child at the PADDING box: the child fills the padding box out to the inner border edge and is cut there, leaving the border fully visible and the top/left padding band showing.

PASS exact match overflow-visible-clip-axis · visible-x-clip-y

overflow-x:visible with overflow-y:clip preserves horizontal overflow while clipping vertical overflow; catches single-rectangle clipping of both axes.

PASS exact match overflow-visible-no-clip · visible

overflow:visible (explicit) does not clip; the oversized child paints beyond the parent box on the right and bottom.

class	bbox (CSS px)	area%	magnitude	reason
Missing	126,33 → 126,35	0.008909		candidate lacks paint present in reference (0.008909%)
AntialiasCoverage	126,33 → 126,35	0.007127	ΔRGB(80,42,68)	antialiasing coverage residue on a shared outline
AntialiasCoverage	117,33 → 117,35	0.006236	ΔRGB(80,42,68)	antialiasing coverage residue on a shared outline
AntialiasCoverage	121,33 → 122,35	0.006236	ΔRGB(80,42,68)	antialiasing coverage residue on a shared outline
AntialiasCoverage	123,33 → 123,35	0.006236	ΔRGB(-34,-18,-29)	antialiasing coverage residue on a shared outline
AntialiasCoverage	127,33 → 128,35	0.006236	ΔRGB(-176,-92,-150)	antialiasing coverage residue on a shared outline
AntialiasCoverage	118,33 → 118,35	0.005345	ΔRGB(-96,-50,-82)	antialiasing coverage residue on a shared outline
Missing	117,33 → 117,35	0.004454		candidate lacks paint present in reference (0.004454%)
Missing	122,33 → 122,35	0.004454		candidate lacks paint present in reference (0.004454%)
Extra	123,33 → 123,35	0.004454		candidate adds paint absent from reference (0.004454%)
Extra	127,33 → 127,35	0.004454		candidate adds paint absent from reference (0.004454%)

overflow-clipping — 100.00% verified visual parity

overflow — 100.00% verified visual parity PASS 13 · FAIL 0 · REFERENCE-DISPUTED 3all categories ↑

Complete dominant-class aggregates

Representative region details (worst-first)

Complete dominant-class aggregates

Representative region details (worst-first)

Complete dominant-class aggregates

Representative region details (worst-first)

Complete dominant-class aggregates

Representative region details (worst-first)

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

Complete dominant-class aggregates

Representative region details (worst-first)

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

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

class	regions	pixels	union bbox (CSS px)	largest px	maximum magnitude
ColorErr	6	42	117,33 → 128,35	8	total 0.04% · largest 0.007127%
Missing	3	20	117,33 → 126,35	10	total 0.02% · largest 0.008909%
Extra	2	10	123,33 → 127,35	5	total 0.008909% · largest 0.004454%