paged-media — 100.00% verified visual parity

← all categories · PASS 87 · FAIL 0 · REFERENCE-DISPUTED 3 · 90 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 87status class min diff% sort

footnote — 100.00% verified visual parity PASS 4 · FAIL 0 · REFERENCE-DISPUTED 3all categories ↑

REFERENCE-DISPUTED 6021 px · above-floor 1.81% · raw 2.05% max-page diff paged-footnote-max-height · area-max-height · oracle: weasyprint · REFERENCE DISPUTED · 2 pagesMissingmissing 5.1%extra 5.1%ΔE 21.3

page 1

page 2

why: page 2: candidate lacks paint present in reference (5.1%)

@footnote max-height is constrained when a page has body content, but GCPM exempts a footnote-only last page. The standards-derived reference preserves the full final footnote body rather than WeasyPrint 69's clipped output.

reference dispute: CSS GCPM limits the footnote area with max-height except on a page containing only footnotes, and footnote-policy:auto permits the body to move to a later page. Both PDFs keep the call on page 1, move the complete body to the footnote-only page 2, and preserve the same three-line wrapping and rule geometry. Every body line in the WeasyPrint PDF is uniformly 0.1157pt lower; horizontal word bounds differ by at most 0.028pt. That renderer-specific baseline and glyph quantization is not prescribed by GCPM, so the WeasyPrint PDF is not a unique pixel oracle; raw shared-pdftoppm evidence remains reported.

regions (1206 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	584	4590	0,0 → 180,51	563	total 5.1% · largest 0.6%
Extra	302	715	0,24 → 178,50	11	total 0.8% · largest 0.01%
Missing	320	716	0,27 → 178,51	15	total 0.8% · largest 0.02%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	0,0 → 180,0	0.6	ΔRGB(-154,-154,-154)	antialiasing coverage residue on a shared outline
AntialiasCoverage	44,27 → 50,33	0.1	ΔRGB(4,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	141,27 → 147,33	0.1	ΔRGB(4,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	1,25 → 4,31	0.04	ΔRGB(-4,-4,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	71,25 → 75,31	0.04	ΔRGB(-4,-4,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	87,25 → 90,31	0.04	ΔRGB(-4,-4,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	167,25 → 171,31	0.04	ΔRGB(-4,-4,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	34,8 → 36,15	0.04	ΔRGB(3,3,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	121,8 → 123,15	0.04	ΔRGB(3,3,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	1,7 → 3,14	0.03	ΔRGB(-4,-4,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	16,31 → 20,33	0.03	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	31,31 → 34,33	0.03	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	65,31 → 68,33	0.03	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	127,31 → 131,33	0.03	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	161,31 → 164,33	0.03	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	6,49 → 10,51	0.03	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	38,27 → 41,28	0.03	ΔRGB(-19,-19,-19)	antialiasing coverage residue on a shared outline
AntialiasCoverage	57,27 → 60,28	0.03	ΔRGB(-19,-19,-19)	antialiasing coverage residue on a shared outline
AntialiasCoverage	93,27 → 96,28	0.03	ΔRGB(-19,-19,-19)	antialiasing coverage residue on a shared outline
AntialiasCoverage	134,27 → 138,28	0.03	ΔRGB(-19,-19,-19)	antialiasing coverage residue on a shared outline
AntialiasCoverage	153,27 → 156,28	0.03	ΔRGB(-19,-19,-19)	antialiasing coverage residue on a shared outline
AntialiasCoverage	17,44 → 18,51	0.03	ΔRGB(4,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	30,9 → 31,15	0.03	ΔRGB(4,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	49,9 → 50,15	0.03	ΔRGB(4,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	87,9 → 89,15	0.03	ΔRGB(4,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	116,9 → 118,15	0.03	ΔRGB(4,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	135,9 → 137,15	0.03	ΔRGB(4,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	76,27 → 80,29	0.03	ΔRGB(-56,-56,-56)	antialiasing coverage residue on a shared outline
AntialiasCoverage	105,27 → 108,29	0.03	ΔRGB(-56,-56,-56)	antialiasing coverage residue on a shared outline
AntialiasCoverage	112,27 → 116,29	0.03	ΔRGB(-56,-56,-56)	antialiasing coverage residue on a shared outline
AntialiasCoverage	173,27 → 177,29	0.03	ΔRGB(-56,-56,-56)	antialiasing coverage residue on a shared outline
AntialiasCoverage	2,45 → 4,51	0.03	ΔRGB(4,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	40,8 → 40,15	0.02	ΔRGB(4,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	127,8 → 127,15	0.02	ΔRGB(4,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	76,29 → 82,31	0.02	ΔRGB(115,115,115)	antialiasing coverage residue on a shared outline
AntialiasCoverage	105,29 → 110,31	0.02	ΔRGB(115,115,115)	antialiasing coverage residue on a shared outline
AntialiasCoverage	112,29 → 117,31	0.02	ΔRGB(115,115,115)	antialiasing coverage residue on a shared outline
AntialiasCoverage	173,29 → 178,31	0.02	ΔRGB(115,115,115)	antialiasing coverage residue on a shared outline
AntialiasCoverage	77,27 → 80,27	0.02	ΔRGB(-21,-21,-21)	antialiasing coverage residue on a shared outline
AntialiasCoverage	105,27 → 108,27	0.02	ΔRGB(-21,-21,-21)	antialiasing coverage residue on a shared outline
AntialiasCoverage	112,27 → 116,27	0.02	ΔRGB(-21,-21,-21)	antialiasing coverage residue on a shared outline
AntialiasCoverage	173,27 → 177,27	0.02	ΔRGB(-21,-21,-21)	antialiasing coverage residue on a shared outline
AntialiasCoverage	77,32 → 81,33	0.02	ΔRGB(-91,-91,-91)	antialiasing coverage residue on a shared outline
AntialiasCoverage	105,32 → 109,33	0.02	ΔRGB(-91,-91,-91)	antialiasing coverage residue on a shared outline
AntialiasCoverage	113,32 → 117,33	0.02	ΔRGB(-91,-91,-91)	antialiasing coverage residue on a shared outline
AntialiasCoverage	173,32 → 178,33	0.02	ΔRGB(-91,-91,-91)	antialiasing coverage residue on a shared outline
AntialiasCoverage	45,34 → 49,35	0.02	ΔRGB(57,57,57)	antialiasing coverage residue on a shared outline
AntialiasCoverage	141,34 → 145,35	0.02	ΔRGB(57,57,57)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,45 → 1,51	0.02	ΔRGB(-4,-4,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	12,26 → 14,28	0.02	ΔRGB(-4,-4,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	12,44 → 14,49	0.02	ΔRGB(-4,-4,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	36,9 → 39,11	0.02	ΔRGB(4,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	123,9 → 125,11	0.02	ΔRGB(4,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	32,9 → 32,15	0.02	ΔRGB(-4,-4,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	51,9 → 51,15	0.02	ΔRGB(-4,-4,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	89,9 → 90,15	0.02	ΔRGB(-4,-4,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	119,9 → 119,15	0.02	ΔRGB(-4,-4,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	138,9 → 138,15	0.02	ΔRGB(-4,-4,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	36,12 → 39,14	0.02	ΔRGB(4,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	123,12 → 125,14	0.02	ΔRGB(4,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	1,32 → 4,33	0.02	ΔRGB(-3,-3,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	72,32 → 75,33	0.02	ΔRGB(-3,-3,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	87,32 → 90,33	0.02	ΔRGB(-3,-3,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	168,32 → 171,33	0.02	ΔRGB(-3,-3,-3)	antialiasing coverage residue on a shared outline

source · cases/paged-media/paged-footnote-max-height.html

1<!DOCTYPE html>
2<html><head><meta charset="utf-8"><title>footnote area max height</title><style>
3@page{size:200px 150px;margin:10px;@footnote{max-height:30px;border-top:2px solid #111}}
4html{font-family:ParitySans;line-height:1.5;font-size:12px}
5*{margin:0;box-sizing:border-box}
6.lead{height:80px;background:#bfdbfe}.fn{float:footnote}
7</style></head><body><div class="lead"></div><p>Line with note<span class="fn">long note one long note two long note three long note four</span></p></body></html>

REFERENCE-DISPUTED 23746 px · above-floor 1.99% · raw 2.03% max-page diff footnote-float · float-footnote · oracle: weasyprint · REFERENCE DISPUTEDMissingmissing 26.1%extra 25.8%ΔE 28.3

why: candidate lacks paint present in reference (26.1%)

CSS GCPM float: footnote pulls a box into the page's footnote area with an auto-numbered call marker left in the body text. The standards-derived source materializes GCPM relocation and its normative baseline-aligned font-variant-position:super call, without prescribing renderer-specific synthetic glyph metrics.

reference dispute: CSS GCPM 3 section 2.6 defines the default footnote call as a superscripted counter with vertical-align:baseline, font-size:100%, line-height:inherit, and font-variant-position:super. Ironpress emits that superscript without moving the body line; WeasyPrint leaves the call full-size on the baseline, so its PDF is a compatibility canary, not a normative pixel oracle.

regions (2995 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	1538	8810	0,0 → 316,220	104	total 1.3% · largest 0.02%
Extra	720	7408	0,0 → 314,218	228	total 1.1% · largest 0.03%
Missing	737	7528	0,4 → 316,220	233	total 1.1% · largest 0.03%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
Missing	308,7 → 316,19	0.03		candidate lacks paint present in reference (0.03%)
Extra	276,4 → 278,15	0.03		candidate adds paint absent from reference (0.03%)
Missing	304,4 → 306,16	0.03		candidate lacks paint present in reference (0.03%)
Extra	232,4 → 234,15	0.03		candidate adds paint absent from reference (0.03%)
Extra	306,7 → 311,19	0.03		candidate adds paint absent from reference (0.03%)
Missing	243,4 → 244,16	0.03		candidate lacks paint present in reference (0.03%)
Missing	219,10 → 226,16	0.03		candidate lacks paint present in reference (0.03%)
Extra	245,7 → 251,16	0.03		candidate adds paint absent from reference (0.03%)
Missing	250,7 → 255,16	0.03		candidate lacks paint present in reference (0.03%)
Missing	257,7 → 262,16	0.02		candidate lacks paint present in reference (0.02%)
Extra	286,7 → 292,16	0.02		candidate adds paint absent from reference (0.02%)
Extra	255,7 → 257,15	0.02		candidate adds paint absent from reference (0.02%)
Missing	291,7 → 296,16	0.02		candidate lacks paint present in reference (0.02%)
Extra	261,7 → 267,16	0.02		candidate adds paint absent from reference (0.02%)
Extra	296,7 → 301,16	0.02		candidate adds paint absent from reference (0.02%)
Missing	282,7 → 286,16	0.02		candidate lacks paint present in reference (0.02%)
Missing	263,7 → 271,14	0.02		candidate lacks paint present in reference (0.02%)
Missing	234,6 → 235,16	0.02		candidate lacks paint present in reference (0.02%)
Extra	241,7 → 243,15	0.02		candidate adds paint absent from reference (0.02%)
Missing	278,8 → 282,14	0.02		candidate lacks paint present in reference (0.02%)
Extra	301,8 → 304,14	0.02		candidate adds paint absent from reference (0.02%)
Missing	288,8 → 291,14	0.02		candidate lacks paint present in reference (0.02%)
Extra	238,4 → 243,11	0.02		candidate adds paint absent from reference (0.02%)
Missing	247,8 → 250,14	0.02		candidate lacks paint present in reference (0.02%)
Missing	298,8 → 301,14	0.02		candidate lacks paint present in reference (0.02%)
Extra	291,8 → 294,14	0.02		candidate adds paint absent from reference (0.02%)
Extra	250,8 → 253,14	0.02		candidate adds paint absent from reference (0.02%)
Extra	281,8 → 284,14	0.02		candidate adds paint absent from reference (0.02%)
AntialiasCoverage	164,208 → 171,214	0.02	ΔRGB(4,14,12)	antialiasing coverage residue on a shared outline
Missing	235,4 → 238,11	0.01		candidate lacks paint present in reference (0.01%)
AntialiasCoverage	70,208 → 77,214	0.01	ΔRGB(4,13,11)	antialiasing coverage residue on a shared outline
AntialiasCoverage	236,208 → 243,214	0.01	ΔRGB(4,13,11)	antialiasing coverage residue on a shared outline
AntialiasCoverage	268,208 → 274,214	0.01	ΔRGB(4,13,11)	antialiasing coverage residue on a shared outline
Extra	311,7 → 314,13	0.01		candidate adds paint absent from reference (0.01%)
Extra	218,0 → 222,4	0.01		candidate adds paint absent from reference (0.01%)
Extra	20,204 → 29,204	0.01		candidate adds paint absent from reference (0.01%)
Missing	308,7 → 310,13	0.01		candidate lacks paint present in reference (0.01%)
Extra	209,207 → 216,215	0.01		candidate adds paint absent from reference (0.01%)
Extra	162,207 → 170,212	0.01		candidate adds paint absent from reference (0.01%)
AntialiasCoverage	210,208 → 216,215	0.01	ΔRGB(-43,-139,-121)	antialiasing coverage residue on a shared outline
AntialiasCoverage	252,209 → 256,216	0.01	ΔRGB(-1,-4,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	278,209 → 282,216	0.01	ΔRGB(-1,-4,-3)	antialiasing coverage residue on a shared outline
Missing	238,8 → 241,13	0.01		candidate lacks paint present in reference (0.01%)
Missing	59,213 → 67,217	0.01		candidate lacks paint present in reference (0.01%)
Missing	69,213 → 76,217	0.01		candidate lacks paint present in reference (0.01%)
Missing	235,213 → 243,217	0.01		candidate lacks paint present in reference (0.01%)
Missing	266,213 → 274,217	0.01		candidate lacks paint present in reference (0.01%)
Extra	69,207 → 76,210	0.01		candidate adds paint absent from reference (0.01%)
Extra	83,207 → 91,210	0.01		candidate adds paint absent from reference (0.01%)
Extra	103,207 → 111,210	0.01		candidate adds paint absent from reference (0.01%)
Extra	183,207 → 191,210	0.01		candidate adds paint absent from reference (0.01%)
Extra	193,207 → 201,210	0.01		candidate adds paint absent from reference (0.01%)
Extra	219,207 → 227,210	0.01		candidate adds paint absent from reference (0.01%)
Extra	235,207 → 243,210	0.01		candidate adds paint absent from reference (0.01%)
Extra	266,207 → 274,210	0.01		candidate adds paint absent from reference (0.01%)
Extra	236,7 → 238,13	0.01		candidate adds paint absent from reference (0.01%)
Missing	210,208 → 215,216	0.01		candidate lacks paint present in reference (0.01%)
Missing	250,215 → 258,217	0.01		candidate lacks paint present in reference (0.01%)
Missing	276,215 → 284,217	0.01		candidate lacks paint present in reference (0.01%)
Extra	302,4 → 304,7	0.01		candidate adds paint absent from reference (0.01%)
Missing	84,214 → 91,217	0.01		candidate lacks paint present in reference (0.01%)
Missing	184,214 → 191,217	0.01		candidate lacks paint present in reference (0.01%)
Missing	193,214 → 200,217	0.01		candidate lacks paint present in reference (0.01%)
Missing	220,214 → 227,217	0.01		candidate lacks paint present in reference (0.01%)

source · cases/paged-media/footnote-float.html

1<!DOCTYPE html>
2<html>
3<head>
4<meta charset="utf-8">
5<style>
6  /* CSS GCPM `float: footnote`: the floated element is pulled out of flow and
7     rendered in the page's footnote area at the bottom, with an automatically
8     numbered call/marker left in the body text. This fixture uses a WeasyPrint
9     oracle because Chrome --print-to-pdf does not implement GCPM footnotes. */
10  @page { size: 400px 300px; margin: 1cm; }
11  * { margin: 0; box-sizing: border-box; }
12  html { font-family: ParitySans; line-height: 1.5; background: #ffffff; color: #111111; }
13  p { font-size: 16px; }
14  .fn { float: footnote; color: #b00020; }
15</style>
16</head>
17<body>
18  <p>Body text with a reference.<span class="fn">This belongs in the footnote area.</span> More body text follows the call.</p>
19</body>
20</html>

REFERENCE-DISPUTED 5507 px · above-floor 1.78% · raw 1.83% max-page diff paged-footnote-display-compact · display-compact · oracle: weasyprint · REFERENCE DISPUTEDAntialiasCoveragemissing 0.4%extra 0.4%ΔE 28.3

why: above-floor complete-page mismatch 1.777371% exceeds 1.0% PASS ceiling; visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

footnote-display:compact places fitting short footnotes inline in the footnote area; the standards-derived source preserves CSS Fonts 4 baseline-aligned synthesized calls.

reference dispute: CSS GCPM requires both fitting compact footnotes to share one inline footnote-area line at the page-area bottom, which both PDFs do. Ironpress preserves a 76.5pt separation between the body and footnote baselines; WeasyPrint preserves the same separation but shifts both by 0.1157pt. Chromium rendering of the independent standards-derived source matches Ironpress within 0.0021pt. The remaining raw signal is renderer-specific text contour and baseline quantization, not compact-footnote placement, so the WeasyPrint PDF is not a unique pixel oracle.

regions (702 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	297	4493	0,1 → 143,115	232	total 2.0% · largest 0.1%
Missing	207	509	0,4 → 143,115	27	total 0.2% · largest 0.01%
Extra	198	505	2,106 → 143,115	24	total 0.2% · largest 0.01%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	6,6 → 12,13	0.1	ΔRGB(1,1,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	85,6 → 91,13	0.1	ΔRGB(1,1,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	101,6 → 107,13	0.1	ΔRGB(1,1,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	35,6 → 41,13	0.10	ΔRGB(-4,-4,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	50,4 → 56,13	0.09	ΔRGB(4,4,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	13,6 → 19,13	0.08	ΔRGB(-4,-4,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	108,6 → 114,13	0.08	ΔRGB(-4,-4,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	73,6 → 79,13	0.08	ΔRGB(-2,-2,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	63,6 → 71,13	0.08	ΔRGB(4,4,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	115,4 → 119,13	0.07	ΔRGB(-2,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	120,1 → 124,8	0.06	ΔRGB(-22,-21,-18)	antialiasing coverage residue on a shared outline
AntialiasCoverage	44,6 → 48,13	0.05	ΔRGB(-3,-3,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	21,4 → 24,13	0.04	ΔRGB(-4,-4,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	97,4 → 100,13	0.04	ΔRGB(-4,-4,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,4 → 8,4	0.02	ΔRGB(-84,-81,-66)	antialiasing coverage residue on a shared outline
AntialiasCoverage	110,108 → 114,115	0.02	ΔRGB(-103,-103,-103)	antialiasing coverage residue on a shared outline
AntialiasCoverage	82,6 → 85,9	0.02	ΔRGB(6,6,5)	antialiasing coverage residue on a shared outline
AntialiasCoverage	43,107 → 46,113	0.02	ΔRGB(-4,-4,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	115,107 → 118,113	0.02	ΔRGB(-4,-4,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	124,107 → 127,113	0.02	ΔRGB(-4,-4,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	26,1 → 28,3	0.01	ΔRGB(-22,-21,-17)	antialiasing coverage residue on a shared outline
AntialiasCoverage	2,107 → 4,114	0.01	ΔRGB(-4,-4,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	31,113 → 35,115	0.01	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	52,113 → 56,115	0.01	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	104,113 → 107,115	0.01	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	139,113 → 142,115	0.01	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
Missing	110,109 → 113,115	0.01		candidate lacks paint present in reference (0.01%)
AntialiasCoverage	73,110 → 77,115	0.01	ΔRGB(-49,-49,-49)	antialiasing coverage residue on a shared outline
AntialiasCoverage	24,108 → 27,110	0.01	ΔRGB(-19,-19,-19)	antialiasing coverage residue on a shared outline
AntialiasCoverage	60,108 → 63,110	0.01	ΔRGB(-19,-19,-19)	antialiasing coverage residue on a shared outline
AntialiasCoverage	96,108 → 99,110	0.01	ΔRGB(-19,-19,-19)	antialiasing coverage residue on a shared outline
Extra	110,108 → 111,115	0.01		candidate adds paint absent from reference (0.01%)
AntialiasCoverage	39,108 → 43,109	0.01	ΔRGB(-6,-6,-6)	antialiasing coverage residue on a shared outline
AntialiasCoverage	67,109 → 70,111	0.01	ΔRGB(-56,-56,-56)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,5 → 8,5	0.009735	ΔRGB(58,56,46)	antialiasing coverage residue on a shared outline
AntialiasCoverage	77,107 → 79,112	0.009735	ΔRGB(27,27,27)	antialiasing coverage residue on a shared outline
AntialiasCoverage	67,111 → 72,113	0.009735	ΔRGB(115,115,115)	antialiasing coverage residue on a shared outline
AntialiasCoverage	67,108 → 70,109	0.009293	ΔRGB(-21,-21,-21)	antialiasing coverage residue on a shared outline
AntialiasCoverage	67,114 → 71,115	0.009293	ΔRGB(-91,-91,-91)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,5 → 3,5	0.008850	ΔRGB(118,112,92)	antialiasing coverage residue on a shared outline
AntialiasCoverage	135,108 → 136,110	0.008850	ΔRGB(-4,-4,-4)	antialiasing coverage residue on a shared outline
Missing	73,115 → 79,115	0.008408		candidate lacks paint present in reference (0.008408%)
AntialiasCoverage	17,108 → 20,109	0.007965	ΔRGB(-14,-14,-14)	antialiasing coverage residue on a shared outline
AntialiasCoverage	89,108 → 92,109	0.007965	ΔRGB(-14,-14,-14)	antialiasing coverage residue on a shared outline
AntialiasCoverage	43,114 → 46,115	0.007965	ΔRGB(-3,-3,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	115,114 → 118,115	0.007965	ΔRGB(-3,-3,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	124,114 → 127,115	0.007965	ΔRGB(-3,-3,-3)	antialiasing coverage residue on a shared outline
Missing	2,115 → 7,115	0.007523		candidate lacks paint present in reference (0.007523%)
AntialiasCoverage	66,110 → 67,114	0.007523	ΔRGB(24,24,24)	antialiasing coverage residue on a shared outline
AntialiasCoverage	27,110 → 27,115	0.007080	ΔRGB(4,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	63,110 → 63,115	0.007080	ΔRGB(4,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	99,110 → 100,115	0.007080	ΔRGB(4,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	75,113 → 79,114	0.007080	ΔRGB(-227,-227,-227)	antialiasing coverage residue on a shared outline
Missing	67,112 → 71,112	0.006638		candidate lacks paint present in reference (0.006638%)
AntialiasCoverage	120,8 → 124,8	0.006638	ΔRGB(254,243,199)	antialiasing coverage residue on a shared outline
AntialiasCoverage	127,11 → 128,13	0.006638	ΔRGB(-77,-73,-60)	antialiasing coverage residue on a shared outline
AntialiasCoverage	28,110 → 28,115	0.006638	ΔRGB(-4,-4,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	64,110 → 64,115	0.006638	ΔRGB(-4,-4,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	100,110 → 100,115	0.006638	ΔRGB(-4,-4,-4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	19,111 → 21,114	0.006638	ΔRGB(-52,-52,-52)	antialiasing coverage residue on a shared outline
AntialiasCoverage	91,111 → 93,114	0.006638	ΔRGB(-52,-52,-52)	antialiasing coverage residue on a shared outline
AntialiasCoverage	26,8 → 30,8	0.006195	ΔRGB(254,243,199)	antialiasing coverage residue on a shared outline
AntialiasCoverage	128,110 → 129,113	0.006195	ΔRGB(64,64,64)	antialiasing coverage residue on a shared outline
AntialiasCoverage	20,6 → 21,7	0.005753	ΔRGB(2,2,2)	antialiasing coverage residue on a shared outline

source · cases/paged-media/paged-footnote-display-compact.html

1<!DOCTYPE html>
2<html><head><meta charset="utf-8"><title>footnote display compact</title><style>
3@page{size:220px 140px;margin:10px}
4html{font-family:ParitySans;line-height:1.5;font-size:12px}
5*{margin:0;box-sizing:border-box}
6p{height:70px;background:#fef3c7}.fn{float:footnote;footnote-display:compact}
7</style></head><body><p>Text<span class="fn">short one</span> and more text<span class="fn">short two</span>.</p></body></html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.22% · raw 0.22% (667 px) paged-footnote-counter-reset · counter-resetPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 2.8

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

counter-reset:footnote changes generated footnote call and marker numbers; the verified standards-derived source preserves CSS Fonts 4 baseline-aligned synthesized calls.

regions (7 total; showing 7 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	667	0,0 → 180,18	198	total 0.3% · largest 0.09% · max ΔE 2.8

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	57,1 → 61,8	0.09	ΔRGB(1,1,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	25,3 → 29,8	0.05	ΔRGB(-3,-3,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	49,6 → 55,13	0.05	ΔRGB(3,3,3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	50,7 → 54,12	0.04	ΔRGB(1,1,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,0 → 0,18	0.02	ΔE 2.8 ΔRGB(11,5,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	180,0 → 180,18	0.02	ΔE 2.8 ΔRGB(-11,-5,0)	antialiasing coverage residue on a shared outline
ColorValue	25,1 → 29,2	0.02	ΔRGB(27,29,30)	fill recolour ΔRGB(+27,+29,+30) (ΔE 0)

source · cases/paged-media/paged-footnote-counter-reset.html

1<!DOCTYPE html>
2<html><head><meta charset="utf-8"><title>footnote counter reset</title><style>
3@page{size:200px 152px;margin:10px}
4html{font-family:ParitySans;line-height:1.5;font-size:12px}
5*{margin:0;box-sizing:border-box}
6body{counter-reset:footnote 4}p{background:#e0f2fe}.fn{float:footnote}
7</style></head><body><p>One<span class="fn">first note</span> two<span class="fn">second note</span>.</p></body></html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.09% · raw 0.09% (226 px) paged-footnote-policy-inline · policy-line-display-inline · 2 pagesPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 25.8

page 1

page 2

why: page 2: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

CSS GCPM footnote-policy:line keeps the line with its first footnote call on the following page while the preceding line remains on the current page; footnote-display:inline lays the note bodies inline. The verified standards-derived source materializes CSS Fonts 4's required synthesized superscript because ParitySans has no sups glyphs and Chromium does not synthesize the missing form.

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	226	132,2 → 143,9	142	total 0.1% · largest 0.07%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	138,2 → 143,8	0.07	ΔRGB(5,25,21)	antialiasing coverage residue on a shared outline
AntialiasCoverage	132,2 → 135,3	0.02	ΔRGB(4,21,17)	antialiasing coverage residue on a shared outline
AntialiasCoverage	138,9 → 143,9	0.007639	ΔRGB(-46,-243,-199)	antialiasing coverage residue on a shared outline
AntialiasCoverage	132,9 → 137,9	0.007130	ΔRGB(-46,-243,-199)	antialiasing coverage residue on a shared outline
AntialiasCoverage	132,8 → 134,8	0.006112	ΔRGB(23,119,97)	antialiasing coverage residue on a shared outline
AntialiasCoverage	135,8 → 137,8	0.006112	ΔRGB(23,119,97)	antialiasing coverage residue on a shared outline

source · cases/paged-media/paged-footnote-policy-inline.html

1<!doctype html>
2<html>
3<head>
4  <meta charset="utf-8">
5  <style>
6    @page {
7      size: 192px 136px;
8      margin: 8px;
9      @footnote { border-top: 8px solid #111111; padding-top: 8px; }
10    }
11    html { font-family: ParitySans; line-height: 1.5; font-size: 12px; }
12    * { margin: 0; box-sizing: border-box; }
13    .lead { width: 176px; height: 72px; background: #e0f2fe; }
14    p { width: 176px; line-height: 20px; background: #fef3c7; }
15    .fn { float: footnote; footnote-display: inline; footnote-policy: line; color: #d00000; }
16  </style>
17</head>
18<body>
19  <div class="lead"></div>
20  <p>First line stays here<br>Second line has notes<span class="fn">first note</span><span class="fn">second note</span></p>
21</body>
22</html>

PASS exact match paged-footnote-policy-block · policy-block · oracle: weasyprint · 2 pages

page 1

page 2

footnote-policy:block moves the whole owning paragraph with its footnote when the note cannot fit. The verified standards-derived reference isolates that visible page-break geometry from unsupported footnote pseudo-element typography.

PASS exact match paged-footnote-styling-pseudos · styling-and-pseudo-elements

A nested GCPM @page/@footnote rule plus ::footnote-call and ::footnote-marker custom content affects the footnote area, calls, and markers. The call explicitly resets GCPM's default font-variant-position and uses baseline alignment, isolating pseudo-element styling from user-agent-defined superscript metrics. Chromium lacks native float:footnote, so the authenticated standards-derived source materializes the required page-area result without importing WeasyPrint's incompatible transformed-text rasterization. The fixture uses integral 300-DPI page geometry to isolate generated-footnote styling.

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

PASS visually equivalent · no rejecting defect · thresholded evidence 0.41% · raw 0.41% (821 px) paged-bleed-crop-background · background-into-bleed · oracle: weasyprintPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 34.5

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

@page bleed with crop marks paints the page background into the bleed area; catches renderers that clip backgrounds to the trim page box.

regions (11 total; showing 11 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	11	821	0,0 → 144,144	499	total 0.4% · largest 0.2%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	12,12 → 92,92	0.2	ΔRGB(-14,89,-36)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,11 → 6,12	0.02	ΔRGB(1,27,21)	antialiasing coverage residue on a shared outline
AntialiasCoverage	138,11 → 144,12	0.02	ΔRGB(1,27,21)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,131 → 6,132	0.02	ΔRGB(1,27,21)	antialiasing coverage residue on a shared outline
AntialiasCoverage	138,131 → 144,132	0.02	ΔRGB(1,27,21)	antialiasing coverage residue on a shared outline
AntialiasCoverage	11,138 → 12,144	0.02	ΔRGB(1,27,21)	antialiasing coverage residue on a shared outline
AntialiasCoverage	131,138 → 132,144	0.02	ΔRGB(1,27,21)	antialiasing coverage residue on a shared outline
AntialiasCoverage	11,0 → 11,6	0.009383	ΔRGB(1,27,21)	antialiasing coverage residue on a shared outline
AntialiasCoverage	12,0 → 12,6	0.009383	ΔRGB(1,27,21)	antialiasing coverage residue on a shared outline
AntialiasCoverage	131,0 → 131,6	0.009383	ΔRGB(1,27,21)	antialiasing coverage residue on a shared outline
AntialiasCoverage	132,0 → 132,6	0.009383	ΔRGB(1,27,21)	antialiasing coverage residue on a shared outline

source · cases/paged-media/paged-bleed-crop-background.html

1<!DOCTYPE html>
2<html><head><meta charset="utf-8"><title>page bleed crop background</title><style>
3@page{size:120px 120px;margin:0;bleed:12px;marks:crop;background:#06d6a0}
4html{font-family:ParitySans;line-height:1.5}
5*{margin:0;box-sizing:border-box}
6.box{width:80px;height:80px;background:#1d4ed8}
7</style></head><body><div class="box"></div></body></html>

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

PASS visually equivalent · no rejecting defect · thresholded evidence 0.13% · raw 0.13% (252 px) paged-break-after-left-from-left · left-from-left-page · oracle: weasyprint · 4 pagesPASS via CSS-scale observation: conserved sub-CSS coverageAntialiasCoveragemissing 0.02%extra 0.02%ΔE 12.4

page 1

page 2

page 3

page 4

why: page 4: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

break-after:left on page 2, a left page, must insert a blank right page so following content starts on page 4; catches implementations that alias left to an ordinary page break.

regions (66 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	22	160	6,10 → 15,21	19	total 0.09% · largest 0.01%
Missing	23	46	7,11 → 14,20	8	total 0.02% · largest 0.004267%
Extra	21	46	7,12 → 14,21	10	total 0.02% · largest 0.005333%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	8,12 → 13,13	0.01	ΔRGB(-1,-39,-65)	antialiasing coverage residue on a shared outline
AntialiasCoverage	9,10 → 12,11	0.008000	ΔRGB(2,47,78)	antialiasing coverage residue on a shared outline
AntialiasCoverage	7,19 → 10,21	0.006933	ΔRGB(-2,-69,-116)	antialiasing coverage residue on a shared outline
AntialiasCoverage	6,14 → 6,17	0.005867	ΔRGB(0,0,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,14 → 8,17	0.005867	ΔRGB(0,-1,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,18 → 10,19	0.005867	ΔRGB(1,37,63)	antialiasing coverage residue on a shared outline
Extra	10,12 → 13,12	0.005333		candidate adds paint absent from reference (0.005333%)
Extra	10,21 → 13,21	0.005333		candidate adds paint absent from reference (0.005333%)
AntialiasCoverage	13,11 → 15,12	0.005333	ΔRGB(2,56,94)	antialiasing coverage residue on a shared outline
AntialiasCoverage	12,19 → 14,20	0.005333	ΔRGB(2,61,102)	antialiasing coverage residue on a shared outline
AntialiasCoverage	10,21 → 13,21	0.005333	ΔRGB(-2,-63,-105)	antialiasing coverage residue on a shared outline
AntialiasCoverage	13,12 → 15,13	0.004800	ΔRGB(-1,-25,-42)	antialiasing coverage residue on a shared outline
AntialiasCoverage	13,20 → 15,21	0.004800	ΔRGB(-2,-59,-98)	antialiasing coverage residue on a shared outline
Missing	10,11 → 12,11	0.004267		candidate lacks paint present in reference (0.004267%)
AntialiasCoverage	7,11 → 8,12	0.003733	ΔRGB(3,81,134)	antialiasing coverage residue on a shared outline
AntialiasCoverage	7,18 → 7,19	0.003200	ΔRGB(-2,-40,-66)	antialiasing coverage residue on a shared outline
Missing	10,20 → 11,20	0.002667		candidate lacks paint present in reference (0.002667%)
Missing	12,20 → 13,20	0.002667		candidate lacks paint present in reference (0.002667%)
AntialiasCoverage	10,20 → 11,20	0.002133	ΔRGB(2,64,107)	antialiasing coverage residue on a shared outline
Missing	9,11 → 10,11	0.001600		candidate lacks paint present in reference (0.001600%)
Missing	13,11 → 13,11	0.001600		candidate lacks paint present in reference (0.001600%)
Extra	13,12 → 14,12	0.001600		candidate adds paint absent from reference (0.001600%)
AntialiasCoverage	7,13 → 7,14	0.001600	ΔRGB(2,41,68)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,13 → 8,14	0.001600	ΔRGB(-1,-19,-32)	antialiasing coverage residue on a shared outline
AntialiasCoverage	14,19 → 15,19	0.001600	ΔRGB(1,23,38)	antialiasing coverage residue on a shared outline
Missing	9,11 → 9,11	0.001067		candidate lacks paint present in reference (0.001067%)
Missing	14,11 → 14,11	0.001067		candidate lacks paint present in reference (0.001067%)
Missing	9,20 → 10,20	0.001067		candidate lacks paint present in reference (0.001067%)
Missing	13,20 → 14,20	0.001067		candidate lacks paint present in reference (0.001067%)
Extra	9,12 → 10,12	0.001067		candidate adds paint absent from reference (0.001067%)
Extra	9,20 → 9,20	0.001067		candidate adds paint absent from reference (0.001067%)
Extra	14,20 → 14,20	0.001067		candidate adds paint absent from reference (0.001067%)
Extra	9,20 → 10,20	0.001067		candidate adds paint absent from reference (0.001067%)
Extra	13,20 → 13,20	0.001067		candidate adds paint absent from reference (0.001067%)
AntialiasCoverage	7,12 → 7,13	0.001067	ΔRGB(3,74,123)	antialiasing coverage residue on a shared outline
Missing	8,12 → 8,12	0.000533		candidate lacks paint present in reference (0.000533%)
Missing	14,12 → 14,12	0.000533		candidate lacks paint present in reference (0.000533%)
Missing	8,12 → 8,12	0.000533		candidate lacks paint present in reference (0.000533%)
Missing	8,12 → 8,12	0.000533		candidate lacks paint present in reference (0.000533%)
Missing	7,12 → 7,12	0.000533		candidate lacks paint present in reference (0.000533%)
Missing	7,13 → 7,13	0.000533		candidate lacks paint present in reference (0.000533%)
Missing	7,14 → 7,14	0.000533		candidate lacks paint present in reference (0.000533%)
Missing	8,18 → 8,18	0.000533		candidate lacks paint present in reference (0.000533%)
Missing	8,19 → 8,19	0.000533		candidate lacks paint present in reference (0.000533%)
Missing	9,19 → 9,19	0.000533		candidate lacks paint present in reference (0.000533%)
Missing	14,19 → 14,19	0.000533		candidate lacks paint present in reference (0.000533%)
Missing	9,19 → 9,19	0.000533		candidate lacks paint present in reference (0.000533%)
Missing	14,19 → 14,19	0.000533		candidate lacks paint present in reference (0.000533%)
Missing	12,20 → 12,20	0.000533		candidate lacks paint present in reference (0.000533%)
Extra	9,12 → 9,12	0.000533		candidate adds paint absent from reference (0.000533%)
Extra	14,12 → 14,12	0.000533		candidate adds paint absent from reference (0.000533%)
Extra	9,12 → 9,12	0.000533		candidate adds paint absent from reference (0.000533%)
Extra	14,12 → 14,12	0.000533		candidate adds paint absent from reference (0.000533%)
Extra	8,13 → 8,13	0.000533		candidate adds paint absent from reference (0.000533%)
Extra	8,14 → 8,14	0.000533		candidate adds paint absent from reference (0.000533%)
Extra	7,17 → 7,17	0.000533		candidate adds paint absent from reference (0.000533%)
Extra	7,18 → 7,18	0.000533		candidate adds paint absent from reference (0.000533%)
Extra	7,19 → 7,19	0.000533		candidate adds paint absent from reference (0.000533%)
Extra	8,19 → 8,19	0.000533		candidate adds paint absent from reference (0.000533%)
Extra	8,20 → 8,20	0.000533		candidate adds paint absent from reference (0.000533%)
Extra	8,20 → 8,20	0.000533		candidate adds paint absent from reference (0.000533%)
Extra	14,20 → 14,20	0.000533		candidate adds paint absent from reference (0.000533%)
AntialiasCoverage	13,12 → 13,12	0.000533	ΔRGB(-1,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	12,20 → 12,20	0.000533	ΔRGB(5,132,221)	antialiasing coverage residue on a shared outline

source · cases/paged-media/paged-break-after-left-from-left.html

1<!DOCTYPE html>
2<html><head><meta charset="utf-8"><title>break-after left from left page</title><style>
3@page{size:160px 120px;margin:0}
4html{font-family:ParitySans;line-height:1.5}
5*{margin:0;box-sizing:border-box}
6.block{width:160px;height:120px;color:#fff;font-size:14px;padding:6px}.a{background:#1d4ed8}.b{background:#16a34a;break-after:left}.c{background:#f97316}
7</style></head><body><div class="block a">A</div><div class="block b">B</div><div class="block c">C</div></body></html>

PASS exact match break-after-page-mid-document · page-mid-document-real · 2 pages

page 1

page 2

Modern break-after:page on the SECOND of three blocks forces the third block onto page 2 while the first two share page 1 — proving the modern break-after path fires mid-flow, not only on the first/last element. The multi-page harness asserts the page COUNT (2) and diffs both pages.

PASS exact match break-after-page-modern · page-modern-real-pagination · 2 pages

page 1

page 2

Modern CSS Fragmentation break-after:page on the first block forces the following content onto page 2 — a genuine TWO-page document. The multi-page harness asserts the page COUNT (2) and diffs both pages.

PASS exact match paged-break-after-avoid-keep-next · avoid-keep-with-next · oracle: weasyprint · 2 pages

page 1

page 2

break-after:avoid keeps two adjacent solid boxes on the same page when they fit together; catches implementations that parse avoid but treat it as a no-op for automatic page breaks.

PASS exact match paged-break-after-right-blank · right-parity-blank · oracle: weasyprint · 3 pages

page 1

page 2

page 3

break-after:right after a full first page must insert a blank left page so the next real block starts on a right page; catches implementations that alias right to an ordinary page break.

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

PASS visually equivalent · no rejecting defect · thresholded evidence 0.13% · raw 0.13% (252 px) paged-break-before-verso-left · verso-left-page · oracle: weasyprint · 4 pagesPASS via CSS-scale observation: conserved sub-CSS coverageAntialiasCoveragemissing 0.02%extra 0.02%ΔE 9.6

page 1

page 2

page 3

page 4

why: page 4: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

break-before:verso after two full pages must skip the natural right page and land on the next left page; catches parsers that treat verso as page or only recognize left/right.

regions (66 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	22	160	6,10 → 15,21	19	total 0.09% · largest 0.01%
Missing	23	46	7,11 → 14,20	8	total 0.02% · largest 0.004267%
Extra	21	46	7,12 → 14,21	10	total 0.02% · largest 0.005333%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	8,12 → 13,13	0.01	ΔRGB(-5,-21,-69)	antialiasing coverage residue on a shared outline
AntialiasCoverage	9,10 → 12,11	0.008000	ΔRGB(7,25,83)	antialiasing coverage residue on a shared outline
AntialiasCoverage	7,19 → 10,21	0.006933	ΔRGB(-10,-37,-123)	antialiasing coverage residue on a shared outline
AntialiasCoverage	6,14 → 6,17	0.005867	ΔRGB(0,0,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,14 → 8,17	0.005867	ΔRGB(0,-1,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,18 → 10,19	0.005867	ΔRGB(5,20,66)	antialiasing coverage residue on a shared outline
Extra	10,12 → 13,12	0.005333		candidate adds paint absent from reference (0.005333%)
Extra	10,21 → 13,21	0.005333		candidate adds paint absent from reference (0.005333%)
AntialiasCoverage	13,11 → 15,12	0.005333	ΔRGB(8,30,99)	antialiasing coverage residue on a shared outline
AntialiasCoverage	12,19 → 14,20	0.005333	ΔRGB(9,33,108)	antialiasing coverage residue on a shared outline
AntialiasCoverage	10,21 → 13,21	0.005333	ΔRGB(-9,-34,-111)	antialiasing coverage residue on a shared outline
AntialiasCoverage	13,12 → 15,13	0.004800	ΔRGB(-3,-14,-45)	antialiasing coverage residue on a shared outline
AntialiasCoverage	13,20 → 15,21	0.004800	ΔRGB(-8,-32,-104)	antialiasing coverage residue on a shared outline
Missing	10,11 → 12,11	0.004267		candidate lacks paint present in reference (0.004267%)
AntialiasCoverage	7,11 → 8,12	0.003733	ΔRGB(12,44,143)	antialiasing coverage residue on a shared outline
AntialiasCoverage	7,18 → 7,19	0.003200	ΔRGB(-6,-22,-70)	antialiasing coverage residue on a shared outline
Missing	10,20 → 11,20	0.002667		candidate lacks paint present in reference (0.002667%)
Missing	12,20 → 13,20	0.002667		candidate lacks paint present in reference (0.002667%)
AntialiasCoverage	10,20 → 11,20	0.002133	ΔRGB(9,35,114)	antialiasing coverage residue on a shared outline
Missing	9,11 → 10,11	0.001600		candidate lacks paint present in reference (0.001600%)
Missing	13,11 → 13,11	0.001600		candidate lacks paint present in reference (0.001600%)
Extra	13,12 → 14,12	0.001600		candidate adds paint absent from reference (0.001600%)
AntialiasCoverage	7,13 → 7,14	0.001600	ΔRGB(6,23,72)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,13 → 8,14	0.001600	ΔRGB(-2,-10,-34)	antialiasing coverage residue on a shared outline
AntialiasCoverage	14,19 → 15,19	0.001600	ΔRGB(3,12,40)	antialiasing coverage residue on a shared outline
Missing	9,11 → 9,11	0.001067		candidate lacks paint present in reference (0.001067%)
Missing	14,11 → 14,11	0.001067		candidate lacks paint present in reference (0.001067%)
Missing	9,20 → 10,20	0.001067		candidate lacks paint present in reference (0.001067%)
Missing	13,20 → 14,20	0.001067		candidate lacks paint present in reference (0.001067%)
Extra	9,12 → 10,12	0.001067		candidate adds paint absent from reference (0.001067%)
Extra	9,20 → 9,20	0.001067		candidate adds paint absent from reference (0.001067%)
Extra	14,20 → 14,20	0.001067		candidate adds paint absent from reference (0.001067%)
Extra	9,20 → 10,20	0.001067		candidate adds paint absent from reference (0.001067%)
Extra	13,20 → 13,20	0.001067		candidate adds paint absent from reference (0.001067%)
AntialiasCoverage	7,12 → 7,13	0.001067	ΔRGB(11,40,131)	antialiasing coverage residue on a shared outline
Missing	8,12 → 8,12	0.000533		candidate lacks paint present in reference (0.000533%)
Missing	14,12 → 14,12	0.000533		candidate lacks paint present in reference (0.000533%)
Missing	8,12 → 8,12	0.000533		candidate lacks paint present in reference (0.000533%)
Missing	8,12 → 8,12	0.000533		candidate lacks paint present in reference (0.000533%)
Missing	7,12 → 7,12	0.000533		candidate lacks paint present in reference (0.000533%)
Missing	7,13 → 7,13	0.000533		candidate lacks paint present in reference (0.000533%)
Missing	7,14 → 7,14	0.000533		candidate lacks paint present in reference (0.000533%)
Missing	8,18 → 8,18	0.000533		candidate lacks paint present in reference (0.000533%)
Missing	8,19 → 8,19	0.000533		candidate lacks paint present in reference (0.000533%)
Missing	9,19 → 9,19	0.000533		candidate lacks paint present in reference (0.000533%)
Missing	14,19 → 14,19	0.000533		candidate lacks paint present in reference (0.000533%)
Missing	9,19 → 9,19	0.000533		candidate lacks paint present in reference (0.000533%)
Missing	14,19 → 14,19	0.000533		candidate lacks paint present in reference (0.000533%)
Missing	12,20 → 12,20	0.000533		candidate lacks paint present in reference (0.000533%)
Extra	9,12 → 9,12	0.000533		candidate adds paint absent from reference (0.000533%)
Extra	14,12 → 14,12	0.000533		candidate adds paint absent from reference (0.000533%)
Extra	9,12 → 9,12	0.000533		candidate adds paint absent from reference (0.000533%)
Extra	14,12 → 14,12	0.000533		candidate adds paint absent from reference (0.000533%)
Extra	8,13 → 8,13	0.000533		candidate adds paint absent from reference (0.000533%)
Extra	8,14 → 8,14	0.000533		candidate adds paint absent from reference (0.000533%)
Extra	7,17 → 7,17	0.000533		candidate adds paint absent from reference (0.000533%)
Extra	7,18 → 7,18	0.000533		candidate adds paint absent from reference (0.000533%)
Extra	7,19 → 7,19	0.000533		candidate adds paint absent from reference (0.000533%)
Extra	8,19 → 8,19	0.000533		candidate adds paint absent from reference (0.000533%)
Extra	8,20 → 8,20	0.000533		candidate adds paint absent from reference (0.000533%)
Extra	8,20 → 8,20	0.000533		candidate adds paint absent from reference (0.000533%)
Extra	14,20 → 14,20	0.000533		candidate adds paint absent from reference (0.000533%)
AntialiasCoverage	13,12 → 13,12	0.000533	ΔRGB(-1,-1,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	12,20 → 12,20	0.000533	ΔRGB(19,72,234)	antialiasing coverage residue on a shared outline

source · cases/paged-media/paged-break-before-verso-left.html

1<!DOCTYPE html>
2<html><head><meta charset="utf-8"><title>break-before verso left page</title><style>
3@page{size:160px 120px;margin:0}
4html{font-family:ParitySans;line-height:1.5}
5*{margin:0;box-sizing:border-box}
6.block{width:160px;height:120px;color:#fff;font-size:14px;padding:6px}.a{background:#1d4ed8}.b{background:#22c55e}.c{background:#eab308;break-before:verso}
7</style></head><body><div class="block a">A</div><div class="block b">B</div><div class="block c">C</div></body></html>

PASS exact match break-before-page-modern-real · page-modern-real-pagination · 2 pages

page 1

page 2

Modern CSS Fragmentation break-before:page (no legacy fallback) on the second block forces it onto page 2 — a genuine TWO-page document. The multi-page harness asserts the page COUNT (2) and diffs both pages (page 1 = blue box, page 2 = green box). Proves the modern break-* family is now parsed and wired into the forced-break path.

PASS exact match paged-break-before-avoid-page-keep-prev · avoid-page-keep-with-previous · oracle: weasyprint · 2 pages

page 1

page 2

break-before:avoid-page keeps two adjacent solid boxes on the same page when they fit together; catches paginators that ignore break-before avoidance during automatic breaks.

PASS exact match paged-break-before-page-modern · page-leading-noop

Modern break-before:page on the first block is a no-op (no preceding content): the forced break is suppressed at the document start, so a single page renders. The modern break-* family is now parsed and wired into the forced-break path (see break-before-page-modern-real for the real two-page case).

PASS exact match paged-break-before-recto-leading · recto-leading-noop

break-before:recto on the first in-flow block must not create a leading blank page; catches implementations that insert parity pages before suppressing leading breaks.

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

PASS exact match break-inside-avoid-figure · avoid-figure-keep-together · 2 pages

page 1

page 2

break-inside:avoid on a <figure> (image + caption) that would straddle a boundary: a 200px spacer leaves too little room, so Chrome keeps the figure together and pushes it WHOLE to page 2 (image and caption stay on the same page). The multi-page harness asserts the page COUNT (2) and diffs both pages.

PASS exact match break-inside-avoid-real · avoid-real-keep-together · 2 pages

page 1

page 2

break-inside:avoid keeps a bordered card together across a page boundary: a tall spacer fills most of page 1, so the card would straddle the boundary and is pushed WHOLE onto page 2 (not split). The multi-page harness asserts the page COUNT (2): page 1 = spacer, page 2 = intact card.

PASS exact match paged-break-inside-avoid · avoid

Modern break-inside:avoid keeps a card intact on a single page. Content already fits, so the rendered result equals an unbroken nested box. The modern break-inside property is now parsed and honored (see break-inside-avoid-real for the cross-page case).

PASS exact match paged-break-inside-avoid-page-card · avoid-page-card · 2 pages

page 1

page 2

break-inside:avoid-page keeps a page-fitting card intact when it would straddle a page boundary; catches parsers that support avoid but not avoid-page.

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

PASS exact match paged-break-precedence-before-left-wins · break-before-left-over-break-after-right · 2 pages

page 1

page 2

At a shared class-A break point, break-before:left on the following block must override break-after:right on the preceding block; catches independent-break implementations that insert a blank page for the earlier value.

PASS exact match paged-break-precedence-before-wins · break-before-over-break-after · oracle: weasyprint · 3 pages

page 1

page 2

page 3

At a shared class-A break point, break-before:right on the following block must win over break-after:left on the preceding block; catches paginators that emit independent breaks and suppress the later side request.

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

PASS exact match paged-child-break-after-propagates · last-child-break-after · 2 pages

page 1

page 2

break-after:page on a wrapper's last in-flow child propagates after the wrapper; catches layouts that fragment the wrapper decoration onto the following page.

PASS exact match paged-child-break-before-propagates · first-child-break-before · 2 pages

page 1

page 2

break-before:page on a wrapper's first in-flow child propagates to before the wrapper; catches layouts that break inside the wrapper and leave wrapper decoration on the previous page.

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

PASS exact match paged-flex-column-fragmentation · column-children-across-pages · 3 pages

page 1

page 2

page 3

A vertical flex container taller than one page should continue its child items on later pages; catches paginators that treat flex containers as unsplittable atoms.

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

PASS exact match multicol-span-all-page-break · multicol-span-all-page-break · 2 pages

page 1

page 2

A column-span: all heading inside a multi-column block interrupts the columns; column flow resumes and fragments across page boundaries.

PASS exact match table-row-taller-than-page · table-row-slice · 3 pages

page 1

page 2

page 3

A single table row taller than the page content box slices its cell background across page fragments.

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

PASS exact match paged-grid-fragmentation-rows · rows-across-pages · 3 pages

page 1

page 2

page 3

Rows in a one-column grid continue across page fragments instead of clipping as one atomic grid; catches paginators that lose lower grid rows while block/table fragmentation works.

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

PASS visually equivalent · no rejecting defect · thresholded evidence 0.22% · raw 0.22% (400 px) paged-marks-crop-cross · crop-cross · oracle: weasyprintPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 21.6

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

@page marks:crop cross emits printer crop and registration marks around the page; catches renderers that implement only page size, margin, and background.

regions (24 total; showing 24 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	24	400	0,0 → 136,136	31	total 0.2% · largest 0.02%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	66,1 → 70,4	0.02	ΔRGB(28,30,32)	antialiasing coverage residue on a shared outline
AntialiasCoverage	1,66 → 4,70	0.02	ΔRGB(28,30,32)	antialiasing coverage residue on a shared outline
AntialiasCoverage	132,66 → 134,70	0.02	ΔRGB(28,30,32)	antialiasing coverage residue on a shared outline
AntialiasCoverage	66,132 → 70,134	0.02	ΔRGB(28,30,32)	antialiasing coverage residue on a shared outline
AntialiasCoverage	7,0 → 8,4	0.02	ΔRGB(-76,-81,-88)	antialiasing coverage residue on a shared outline
AntialiasCoverage	127,0 → 128,4	0.02	ΔRGB(-76,-81,-88)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,7 → 4,8	0.02	ΔRGB(-76,-81,-88)	antialiasing coverage residue on a shared outline
AntialiasCoverage	132,7 → 136,8	0.02	ΔRGB(-76,-81,-88)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,127 → 4,128	0.02	ΔRGB(-76,-81,-88)	antialiasing coverage residue on a shared outline
AntialiasCoverage	132,127 → 136,128	0.02	ΔRGB(-76,-81,-88)	antialiasing coverage residue on a shared outline
AntialiasCoverage	7,132 → 8,136	0.02	ΔRGB(-76,-81,-88)	antialiasing coverage residue on a shared outline
AntialiasCoverage	127,132 → 128,136	0.02	ΔRGB(-76,-81,-88)	antialiasing coverage residue on a shared outline
AntialiasCoverage	68,1 → 70,2	0.003875	ΔRGB(-66,-71,-77)	antialiasing coverage residue on a shared outline
AntialiasCoverage	1,68 → 2,70	0.003875	ΔRGB(-66,-71,-77)	antialiasing coverage residue on a shared outline
AntialiasCoverage	134,68 → 134,70	0.003875	ΔRGB(-66,-71,-77)	antialiasing coverage residue on a shared outline
AntialiasCoverage	68,134 → 70,134	0.003875	ΔRGB(-66,-71,-77)	antialiasing coverage residue on a shared outline
AntialiasCoverage	68,0 → 68,1	0.001661	ΔRGB(78,83,90)	antialiasing coverage residue on a shared outline
AntialiasCoverage	68,0 → 68,1	0.001661	ΔRGB(78,83,90)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,68 → 1,68	0.001661	ΔRGB(78,83,90)	antialiasing coverage residue on a shared outline
AntialiasCoverage	135,68 → 136,68	0.001661	ΔRGB(78,83,90)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,68 → 1,68	0.001661	ΔRGB(78,83,90)	antialiasing coverage residue on a shared outline
AntialiasCoverage	135,68 → 136,68	0.001661	ΔRGB(78,83,90)	antialiasing coverage residue on a shared outline
AntialiasCoverage	68,135 → 68,136	0.001661	ΔRGB(78,83,90)	antialiasing coverage residue on a shared outline
AntialiasCoverage	68,135 → 68,136	0.001661	ΔRGB(78,83,90)	antialiasing coverage residue on a shared outline

source · cases/paged-media/paged-marks-crop-cross.html

1<!DOCTYPE html>
2<html><head><meta charset="utf-8"><title>page crop and cross marks</title><style>
3@page{size:120px 120px;margin:10px;marks:crop cross;background:#dbeafe}
4html{font-family:ParitySans;line-height:1.5}
5*{margin:0;box-sizing:border-box}
6.box{height:40px;background:#16a34a}
7</style></head><body><div class="box"></div></body></html>

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

PASS visually equivalent · no rejecting defect · thresholded evidence 0.29% · raw 0.29% (3426 px) paged-named-page-size · page-size-override · oracle: weasyprint · 2 pagesPASS via CSS-scale observation: sub-CSS shared-outline coverageAntialiasCoveragemissing 0.4%ΔE 15.7

page 1

page 2

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

CSS Paged Media 3 §3.4 named-page SIZE: @page big { size: A3 } selected by .big { page: big } makes page 2 physically A3-sized while page 1 keeps the default 400px by 304px size. The authenticated WeasyPrint reference uses the standard 297mm by 420mm A3 MediaBox; box edges use integral 300-DPI geometry so the assertion isolates per-page size selection.

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
Missing	2	1175	0,0 → 224,152	700	total 0.4% · largest 0.2%
ColorErr	2	2251	4,4 → 224,152	2250	total 0.7% · largest 0.7%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	4,4 → 220,148	0.7	ΔRGB(-5,-10,-23)	antialiasing coverage residue on a shared outline
Missing	0,152 → 224,152	0.2		candidate lacks paint present in reference (0.2%)
Missing	224,0 → 224,152	0.1		candidate lacks paint present in reference (0.1%)
AntialiasCoverage	224,152 → 224,152	0.000300	ΔRGB(4,4,3)	antialiasing coverage residue on a shared outline

source · cases/paged-media/paged-named-page-size.html

1<!DOCTYPE html>
2<html>
3<head>
4<meta charset="utf-8">
5<style>
6  /* CSS Paged Media 3 §3.4 named-page SIZE: `@page big { size: A3 }` selected by
7     `.big { page: big }` should make the page the box lands on physically larger
8     (A3) than the default page, while page 1 keeps the default 400px by 300px
9     size. */
10  @page { size: 400px 304px; margin: 32px; }
11  @page big { size: A3; margin: 32px; }
12  * { margin: 0; box-sizing: border-box; }
13  html { font-family: ParitySans; line-height: 1.5; background: #ffffff; }
14  .normal { width: 224px; height: 152px; background: #2d6cdf; border: 4px solid #11305f; }
15  .big { page: big; width: 304px; height: 200px; background: #ffb703; border: 4px solid #fb8500; }
16</style>
17</head>
18<body>
19  <div class="normal"></div>
20  <div class="big"></div>
21</body>
22</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.12% · raw 0.12% (200 px) paged-named-page-continuation · continuation-geometry · 5 pagesPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 12.1

page 1

page 2

page 3

page 4

page 5

why: page 2: visually accepted coverage phase; raw antialiasing coverage residue on a shared outline

A tall element assigned page:chapter keeps the chapter page size and margin on continuation pages; catches named-page implementations that apply geometry only to the first fragment.

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	200	0,0 → 0,64	200	total 0.3% · largest 0.3%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	0,0 → 0,64	0.3	ΔRGB(70,28,54)	antialiasing coverage residue on a shared outline

source · cases/paged-media/paged-named-page-continuation.html

1<!DOCTYPE html>
2<html><head><meta charset="utf-8"><title>named page continuation geometry</title><style>
3@page{size:160px 120px;margin:0}
4@page chapter{size:160px 104px;margin:20px}
5html{font-family:ParitySans;line-height:1.5}
6*{margin:0;box-sizing:border-box}
7.cover{height:120px;background:#1d4ed8;color:#fff;font-size:14px;padding:6px}.chapter{page:chapter;height:220px;background:#16a34a;color:#111;font-size:12px}
8</style></head><body><div class="cover">cover</div><div class="chapter">chapter content</div></body></html>

PASS exact match paged-named-page · page-property-leading-noop

The page property names an @page rule (page: cover) on the document's FIRST block, with no matching @page cover rule. Named pages are now parsed (CSS Paged Media 3 §3.4): the property forces a page break before the box, but a forced break at the very start of the fragmentation flow is suppressed, so a single page renders with the section on the default page — matching Chrome. The named-page MARGIN application is covered by paged-named-page-margin.

PASS exact match paged-named-page-margin · page-margin-override · 2 pages

page 1

page 2

CSS Paged Media 3 §3.4 named pages: page: wide on a .cover block forces a page break and the page it starts (page 2) adopts the @page wide margin (16px) instead of the default @page margin (32px). The multi-page harness asserts the page count and compares both page geometries on integral 300-DPI boundaries, avoiding a non-semantic fractional-raster edge.

PASS exact match paged-root-named-page · root-start-page-value

CSS Paged Media 3 section 8.1: page: chapter on body supplies the root start page value, so the first printed page uses the matching named @page margin box instead of the universal one.

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

PASS exact match orphans-3 · orphans-3 · 2 pages

page 1

page 2

orphans:3 requires at least three line boxes at the bottom of a fragment before a break. The five-line paragraph fragments across two pages; the break leaves 3 lines on page 1 and 2 on page 2 (Chrome). The harness asserts the page COUNT (2) and diffs both pages.

PASS exact match orphans-4 · orphans-4 · 2 pages

page 1

page 2

orphans:4 requires at least four line boxes left at the bottom of a fragment. A 100px spacer leaves only three line-slots on page 1, so the five-line paragraph cannot satisfy orphans:4 there and is pushed WHOLE to page 2 (Chrome); the initial orphans:2 would instead split it. The multi-page harness asserts the page COUNT (2) and diffs both pages.

PASS exact match orphans-widows-default · default-2-real-fragmentation · 2 pages

page 1

page 2

A five-line paragraph taller than the @page content box (which fits four lines) is fragmented across two pages. With the initial orphans:2/widows:2, a naive greedy fill (4 lines on page 1, a single widow on page 2) is corrected so each fragment keeps >=2 lines: Chrome puts 3 lines on page 1 and 2 on page 2. The multi-page harness asserts the page COUNT (2) and diffs both pages — a real orphans/widows test, not a single-page no-op.

PASS exact match paged-orphans-widows · single-page-noop

orphans:3/widows:3 on a paragraph whose lines all fit on one page have no visible effect; a single-page guard that the orphans/widows properties parse and never regress the no-break case (real cross-page fragmentation is covered by orphans-widows-default, orphans-3, widows-3, widows-4, orphans-4).

PASS exact match widows-3 · widows-3 · 2 pages

page 1

page 2

widows:3 requires at least three line boxes at the top of the next fragment after a break. The five-line paragraph fragments across two pages; the break moves earlier so the continuation starts with 3 lines, leaving 2 on page 1 (Chrome). The harness asserts the page COUNT (2) and diffs both pages.

PASS exact match widows-4 · widows-4 · 2 pages

page 1

page 2

widows:4 forces at least four line boxes onto the continuation page. An eight-line paragraph in a six-line page would naively split 6/2, but widows:4 moves the break two lines earlier to 4/4 (Chrome). The multi-page harness asserts the page COUNT (2) and diffs both pages.

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

PASS exact match at-page-background-bleed · bleed-area-full-page

A background declared on @page paints the bleed area — the entire page box INCLUDING the @page margins (CSS Paged Media 3 §3.1). The 40px margin band is filled; a white bordered card sits inset in the content box.

PASS exact match root-background-content-box · canvas-confined-to-content

A propagated :root/canvas background is the document canvas, confined to the page content box — it does NOT paint the @page margin band (CSS Paged Media 3 §3.1). Same geometry as at-page-background-bleed, but the 40px margins stay white; the blue fills only inside them.

page-break-after — 100.00% verified visual parity PASS 1 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS exact match paged-page-break-after-always-single · always-trailing-noop

page-break-after:always on the LAST in-flow block (nothing follows) must NOT emit a trailing blank page — Chrome renders one page, not two. The multi-page harness asserts the page COUNT (1) as well as page-1 content, which catches the trailing-blank-page bug the page-1-only comparison used to hide.

page-break-before — 100.00% verified visual parity PASS 3 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS exact match paged-break-before-third-block · always-mid-document-real · 2 pages

page 1

page 2

Legacy page-break-before:always on the THIRD of three blocks moves it to page 2 while the first two share page 1 — proving the legacy forced break fires mid-flow. The multi-page harness asserts the page COUNT (2) and diffs both pages.

PASS exact match paged-forced-break-two-pages · forced-break-real-pagination · 2 pages

page 1

page 2

page-break-before:always puts the second box on page 2, so the document is genuinely TWO pages. The multi-page harness asserts the page COUNT (2) and diffs BOTH pages against Chrome (page 1 = blue box, page 2 = green box) — a real pagination test, not a single-page no-op.

PASS exact match paged-page-break-before-avoid-noop · avoid-noop

page-break-before:avoid on content that already fits on one page is a no-op; both blocks remain stacked. Tracks the legacy avoid-value gap.

page-break-inside — 100.00% verified visual parity PASS 3 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS exact match page-break-inside-avoid-card-legacy · avoid-card-straddle-real · 2 pages

page 1

page 2

Legacy page-break-inside:avoid on a bordered CARD that would straddle a boundary: a 220px spacer leaves too little room, so Chrome (and ironpress) push the whole card to page 2. Confirms the legacy alias is honored for block containers. The multi-page harness asserts the page COUNT (2) and diffs both pages.

PASS exact match page-break-inside-avoid-table-straddle · avoid-table-straddle-real · 2 pages

page 1

page 2

Legacy page-break-inside:avoid on a TABLE that would straddle a page boundary: a 150px spacer leaves too little room for the 160px table. Chrome keeps the table whole and pushes it to page 2; ironpress now honors table-level keep-together too (the avoid-inside table fits a full page, so the whole row run is moved to page 2 instead of split between rows, matching the block-level keep-together in break-inside-avoid-real). The multi-page harness asserts the page COUNT (2) and diffs both pages.

PASS exact match paged-page-break-inside-avoid-table · avoid-table

page-break-inside:avoid on a table that already fits keeps the whole table on one page. Tracks the legacy page-break-inside gap with a geometry-deterministic table.

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

PASS visually equivalent · no rejecting defect · thresholded evidence 0.76% · raw 0.77% (1244 px) paged-page-counter-increment-two · counter-increment-page-two · oracle: weasyprint · 3 pagesPASS via CSS-scale observation: conserved sub-CSS coverageMissingmissing 0.9%extra 0.9%ΔE 35.8

page 1

page 2

page 3

why: visually accepted coverage phase; raw candidate lacks paint present in reference (0.9%)

@page counter-increment:page 2 changes counter(page) in margin boxes; catches renderers that substitute the physical one-based page index.

regions (51 total; showing 51 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	25	144	71,0 → 79,12	36	total 0.2% · largest 0.04%
Extra	10	550	0,0 → 160,17	500	total 0.6% · largest 0.6%
Missing	16	550	0,0 → 160,57	500	total 0.6% · largest 0.6%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
Missing	0,57 → 160,57	0.6		candidate lacks paint present in reference (0.6%)
Extra	0,17 → 160,17	0.6		candidate adds paint absent from reference (0.6%)
Extra	71,1 → 71,12	0.04		candidate adds paint absent from reference (0.04%)
AntialiasCoverage	71,1 → 71,12	0.04	ΔRGB(-231,-231,-231)	antialiasing coverage residue on a shared outline
AntialiasCoverage	73,2 → 73,6	0.02	ΔRGB(39,39,39)	antialiasing coverage residue on a shared outline
AntialiasCoverage	73,7 → 73,12	0.02	ΔRGB(39,39,39)	antialiasing coverage residue on a shared outline
Missing	73,8 → 73,12	0.02		candidate lacks paint present in reference (0.02%)
Missing	73,2 → 73,6	0.01		candidate lacks paint present in reference (0.01%)
AntialiasCoverage	77,1 → 78,3	0.01	ΔRGB(37,37,37)	antialiasing coverage residue on a shared outline
AntialiasCoverage	75,7 → 77,7	0.008989	ΔRGB(35,35,35)	antialiasing coverage residue on a shared outline
Missing	79,3 → 79,5	0.007865		candidate lacks paint present in reference (0.007865%)
AntialiasCoverage	79,3 → 79,5	0.007865	ΔRGB(183,183,183)	antialiasing coverage residue on a shared outline
AntialiasCoverage	77,6 → 78,7	0.007865	ΔRGB(54,54,54)	antialiasing coverage residue on a shared outline
Extra	77,3 → 77,4	0.005618		candidate adds paint absent from reference (0.005618%)
AntialiasCoverage	77,3 → 77,4	0.005618	ΔRGB(-42,-42,-42)	antialiasing coverage residue on a shared outline
AntialiasCoverage	75,6 → 76,6	0.005618	ΔRGB(-8,-8,-8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	75,0 → 76,0	0.004494	ΔRGB(16,16,16)	antialiasing coverage residue on a shared outline
AntialiasCoverage	76,0 → 77,1	0.004494	ΔRGB(60,60,60)	antialiasing coverage residue on a shared outline
AntialiasCoverage	75,2 → 76,2	0.004494	ΔRGB(-20,-20,-20)	antialiasing coverage residue on a shared outline
Missing	79,2 → 79,3	0.003371		candidate lacks paint present in reference (0.003371%)
AntialiasCoverage	76,2 → 76,2	0.003371	ΔRGB(-63,-63,-63)	antialiasing coverage residue on a shared outline
AntialiasCoverage	76,5 → 76,6	0.003371	ΔRGB(-45,-45,-45)	antialiasing coverage residue on a shared outline
Missing	79,5 → 79,5	0.002247		candidate lacks paint present in reference (0.002247%)
Missing	78,6 → 78,6	0.002247		candidate lacks paint present in reference (0.002247%)
Extra	77,3 → 77,3	0.002247		candidate adds paint absent from reference (0.002247%)
Extra	77,5 → 77,5	0.002247		candidate adds paint absent from reference (0.002247%)
AntialiasCoverage	77,3 → 77,3	0.002247	ΔRGB(-59,-59,-59)	antialiasing coverage residue on a shared outline
AntialiasCoverage	77,5 → 77,5	0.002247	ΔRGB(-48,-48,-48)	antialiasing coverage residue on a shared outline
AntialiasCoverage	78,5 → 78,5	0.002247	ΔRGB(134,134,134)	antialiasing coverage residue on a shared outline
Missing	76,0 → 76,0	0.001124		candidate lacks paint present in reference (0.001124%)
Missing	77,1 → 77,1	0.001124		candidate lacks paint present in reference (0.001124%)
Missing	78,1 → 78,1	0.001124		candidate lacks paint present in reference (0.001124%)
Missing	78,1 → 78,1	0.001124		candidate lacks paint present in reference (0.001124%)
Missing	78,2 → 78,2	0.001124		candidate lacks paint present in reference (0.001124%)
Missing	78,6 → 78,6	0.001124		candidate lacks paint present in reference (0.001124%)
Missing	78,7 → 78,7	0.001124		candidate lacks paint present in reference (0.001124%)
Missing	77,7 → 77,7	0.001124		candidate lacks paint present in reference (0.001124%)
Missing	76,7 → 76,7	0.001124		candidate lacks paint present in reference (0.001124%)
Extra	71,0 → 71,0	0.001124		candidate adds paint absent from reference (0.001124%)
Extra	76,2 → 76,2	0.001124		candidate adds paint absent from reference (0.001124%)
Extra	76,2 → 76,2	0.001124		candidate adds paint absent from reference (0.001124%)
Extra	76,5 → 76,5	0.001124		candidate adds paint absent from reference (0.001124%)
Extra	76,6 → 76,6	0.001124		candidate adds paint absent from reference (0.001124%)
AntialiasCoverage	71,0 → 71,0	0.001124	ΔRGB(-10,-10,-10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	77,2 → 77,2	0.001124	ΔRGB(-108,-108,-108)	antialiasing coverage residue on a shared outline
AntialiasCoverage	76,3 → 76,3	0.001124	ΔRGB(-2,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	77,3 → 77,3	0.001124	ΔRGB(-5,-5,-5)	antialiasing coverage residue on a shared outline
AntialiasCoverage	77,4 → 77,4	0.001124	ΔRGB(-8,-8,-8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	76,5 → 76,5	0.001124	ΔRGB(-6,-6,-6)	antialiasing coverage residue on a shared outline
AntialiasCoverage	77,5 → 77,5	0.001124	ΔRGB(-88,-88,-88)	antialiasing coverage residue on a shared outline
AntialiasCoverage	79,6 → 79,6	0.001124	ΔRGB(11,11,11)	antialiasing coverage residue on a shared outline

source · cases/paged-media/paged-page-counter-increment-two.html

1<!DOCTYPE html>
2<html><head><meta charset="utf-8"><title>page counter increment two</title><style>
3@page{size:160px 104px;margin:20px 0 0 0;counter-increment:page 2;@top-center{content:"P" counter(page)}}
4html{font-family:ParitySans;line-height:1.5}
5*{margin:0;box-sizing:border-box}
6.block{height:40px}.block+.block{break-before:page}.a{background:#ef476f}.b{background:#ffd166}.c{background:#06d6a0}
7</style></head><body><div class="block a"></div><div class="block b"></div><div class="block c"></div></body></html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.62% · raw 0.62% (1000 px) paged-page-counter-reset-increment · counter-reset-then-increment · oracle: weasyprint · 2 pagesPASS via CSS-scale observation: stable same-coordinate outline phaseMissingmissing 0.8%extra 0.8%

page 1

page 2

why: visually accepted coverage phase; raw candidate lacks paint present in reference (0.8%)

counter-reset:page 7 with counter-increment:page 2 resolves each page-local counter to 9; catches renderers that carry a reset between pages or omit an explicit increment after it.

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
Extra	1	500	0,17 → 160,17	500	total 0.6% · largest 0.6%
Missing	1	500	0,57 → 160,57	500	total 0.6% · largest 0.6%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
Missing	0,57 → 160,57	0.6		candidate lacks paint present in reference (0.6%)
Extra	0,17 → 160,17	0.6		candidate adds paint absent from reference (0.6%)

source · cases/paged-media/paged-page-counter-reset-increment.html

1<!DOCTYPE html>
2<html><head><meta charset="utf-8"><title>page counter reset and increment</title><style>
3@page{size:160px 104px;margin:20px 0 0 0;counter-reset:page 7;counter-increment:page 2;@top-center{content:"R" counter(page)}}
4html{font-family:ParitySans;line-height:1.5}
5*{margin:0;box-sizing:border-box}
6.block{height:40px}.block+.block{break-before:page}.a{background:#6d28d9}.b{background:#f97316}
7</style></head><body><div class="block a"></div><div class="block b"></div></body></html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.62% · raw 0.62% (1000 px) paged-page-counter-reset-seven · counter-reset-page-seven · oracle: weasyprint · 2 pagesPASS via CSS-scale observation: stable same-coordinate outline phaseMissingmissing 0.8%extra 0.8%

page 1

page 2

why: visually accepted coverage phase; raw candidate lacks paint present in reference (0.8%)

@page counter-reset:page 7 changes the origin of counter(page) in margin boxes; catches renderers that ignore page-context counter reset.

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
Extra	1	500	0,16 → 160,16	500	total 0.6% · largest 0.6%
Missing	1	500	0,56 → 160,56	500	total 0.6% · largest 0.6%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
Missing	0,56 → 160,56	0.6		candidate lacks paint present in reference (0.6%)
Extra	0,16 → 160,16	0.6		candidate adds paint absent from reference (0.6%)

source · cases/paged-media/paged-page-counter-reset-seven.html

1<!DOCTYPE html>
2<html><head><meta charset="utf-8"><title>page counter reset seven</title><style>
3@page{size:160px 104px;margin:20px 0 0 0;counter-reset:page 7;@top-center{content:"N" counter(page)}}
4html{font-family:ParitySans;line-height:1.5}
5*{margin:0;box-sizing:border-box}
6.block{height:40px}.block+.block{break-before:page}.a{background:#1d4ed8}.b{background:#16a34a}
7</style></head><body><div class="block a"></div><div class="block b"></div></body></html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.62% · raw 0.62% (1000 px) paged-pages-counter-immutable · pages-counter-immutable · oracle: weasyprint · 2 pagesPASS via CSS-scale observation: stable same-coordinate outline phaseMissingmissing 0.8%extra 0.8%

page 1

page 2

why: visually accepted coverage phase; raw candidate lacks paint present in reference (0.8%)

counter-reset:pages in the page context must not alter counter(pages), which remains the total page count; catches over-eager page counter implementations.

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
Extra	1	500	0,17 → 160,17	500	total 0.6% · largest 0.6%
Missing	1	500	0,57 → 160,57	500	total 0.6% · largest 0.6%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
Missing	0,57 → 160,57	0.6		candidate lacks paint present in reference (0.6%)
Extra	0,17 → 160,17	0.6		candidate adds paint absent from reference (0.6%)

source · cases/paged-media/paged-pages-counter-immutable.html

1<!DOCTYPE html>
2<html><head><meta charset="utf-8"><title>pages counter immutable</title><style>
3@page{size:160px 104px;margin:20px 0 0 0;counter-reset:pages 99;@top-center{content:"of " counter(pages)}}
4html{font-family:ParitySans;line-height:1.5}
5*{margin:0;box-sizing:border-box}
6.block{height:40px}.block+.block{break-before:page}.a{background:#ef476f}.b{background:#118ab2}
7</style></head><body><div class="block a"></div><div class="block b"></div></body></html>

PASS exact match paged-page-counter-content · counter-page-in-content

content: counter(page) used in NORMAL DOCUMENT FLOW (.pagenum::after) is an ordinary undefined counter that resolves to 0 in both Chrome and ironpress (the page/pages counters are special only inside @page margin boxes, which ironpress now supports — see the render_at_page_margin_box_counters_three_pages PDF-text test). This fixture locks in the in-flow 0-resolution parity with Chrome.

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

PASS visually equivalent · no rejecting defect · thresholded evidence 0.06% · raw 0.06% (187 px) paged-page-margin-percentage · percentagePASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 12.1

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

@page margin:10% creates a visible inset from the page box; catches page margin parsers that accept only absolute lengths.

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	187	0,0 → 0,60	187	total 0.4% · largest 0.4%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	0,0 → 0,60	0.4	ΔRGB(70,28,54)	antialiasing coverage residue on a shared outline

source · cases/paged-media/paged-page-margin-percentage.html

1<!DOCTYPE html>
2<html><head><meta charset="utf-8"><title>page margin percentage</title><style>
3@page{size:200px 160px;margin:10%}
4html{font-family:ParitySans;line-height:1.5}
5*{margin:0;box-sizing:border-box}
6.box{width:80px;height:60px;background:#16a34a}
7</style></head><body><div class="box"></div></body></html>

PASS exact match paged-body-margin-box · via-body-margin

Page margin exercised through an explicit 40px body margin (fixtures may not use @page); a filled, bordered content box is inset uniformly inside the single Letter page.

PASS exact match paged-page-margin-three-values · three-value-shorthand

@page margin with three values resolves top, horizontal, and bottom margins; catches parsers that ignore this shorthand arity.

page-margin-box — 100.00% verified visual parity PASS 11 · FAIL 0 · REFERENCE-DISPUTED 0all categories ↑

PASS visually equivalent · no rejecting defect · thresholded evidence 0.75% · raw 0.77% (2784 px) paged-margin-box-after-synthetic-weight · font-carrier-transitionPASS via CSS-scale observation: conserved sub-CSS coverageMissingmissing 0.2%extra 0.2%ΔE 20.0

why: visually accepted coverage phase; raw candidate lacks paint present in reference (0.2%)

A large plain-weight top-center header remains visible after synthetic-bold document text. Chromium lacks page-margin generated content, so the verified standards-derived Foundation reference materializes CSS Page 3's fixed top-margin geometry and document-before-margin-box paint order. Catches PDF font-carrier state leaking from document content into later page decorations.

regions (676 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	292	1708	13,6 → 178,24	29	total 0.5% · largest 0.008056%
Extra	212	538	14,6 → 178,23	28	total 0.1% · largest 0.007778%
Missing	172	538	14,8 → 178,24	33	total 0.1% · largest 0.009167%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
Missing	32,24 → 43,24	0.009167		candidate lacks paint present in reference (0.009167%)
Missing	119,24 → 129,24	0.009167		candidate lacks paint present in reference (0.009167%)
AntialiasCoverage	18,15 → 25,17	0.008056	ΔRGB(-41,-39,-37)	antialiasing coverage residue on a shared outline
AntialiasCoverage	80,15 → 87,17	0.008056	ΔRGB(-41,-39,-37)	antialiasing coverage residue on a shared outline
AntialiasCoverage	104,15 → 111,17	0.008056	ΔRGB(-41,-39,-37)	antialiasing coverage residue on a shared outline
AntialiasCoverage	167,15 → 173,17	0.008056	ΔRGB(-41,-39,-37)	antialiasing coverage residue on a shared outline
AntialiasCoverage	34,21 → 43,22	0.008056	ΔRGB(-52,-50,-47)	antialiasing coverage residue on a shared outline
AntialiasCoverage	121,21 → 129,22	0.008056	ΔRGB(-52,-50,-47)	antialiasing coverage residue on a shared outline
Missing	62,15 → 71,15	0.007778		candidate lacks paint present in reference (0.007778%)
Missing	148,15 → 157,15	0.007778		candidate lacks paint present in reference (0.007778%)
Extra	62,13 → 71,13	0.007778		candidate adds paint absent from reference (0.007778%)
Extra	148,13 → 157,13	0.007778		candidate adds paint absent from reference (0.007778%)
AntialiasCoverage	62,13 → 71,13	0.007778	ΔRGB(-63,-61,-57)	antialiasing coverage residue on a shared outline
AntialiasCoverage	148,13 → 157,13	0.007778	ΔRGB(-63,-61,-57)	antialiasing coverage residue on a shared outline
AntialiasCoverage	62,15 → 71,15	0.007778	ΔRGB(7,7,6)	antialiasing coverage residue on a shared outline
AntialiasCoverage	148,15 → 157,15	0.007778	ΔRGB(7,7,6)	antialiasing coverage residue on a shared outline
Extra	34,22 → 43,22	0.007500		candidate adds paint absent from reference (0.007500%)
Extra	121,22 → 129,22	0.007500		candidate adds paint absent from reference (0.007500%)
Missing	18,19 → 26,19	0.007222		candidate lacks paint present in reference (0.007222%)
Missing	80,19 → 88,19	0.007222		candidate lacks paint present in reference (0.007222%)
Missing	104,19 → 112,19	0.007222		candidate lacks paint present in reference (0.007222%)
Missing	166,19 → 174,19	0.007222		candidate lacks paint present in reference (0.007222%)
AntialiasCoverage	45,6 → 53,6	0.006944	ΔRGB(-160,-155,-145)	antialiasing coverage residue on a shared outline
AntialiasCoverage	132,6 → 139,6	0.006944	ΔRGB(-160,-155,-145)	antialiasing coverage residue on a shared outline
AntialiasCoverage	18,19 → 25,19	0.006944	ΔRGB(7,7,6)	antialiasing coverage residue on a shared outline
AntialiasCoverage	80,19 → 87,19	0.006944	ΔRGB(7,7,6)	antialiasing coverage residue on a shared outline
AntialiasCoverage	104,19 → 111,19	0.006944	ΔRGB(7,7,6)	antialiasing coverage residue on a shared outline
AntialiasCoverage	166,19 → 174,19	0.006944	ΔRGB(7,7,6)	antialiasing coverage residue on a shared outline
Extra	46,6 → 53,6	0.006389		candidate adds paint absent from reference (0.006389%)
Extra	132,6 → 139,6	0.006389		candidate adds paint absent from reference (0.006389%)
Extra	18,17 → 25,17	0.005833		candidate adds paint absent from reference (0.005833%)
Extra	80,17 → 87,17	0.005833		candidate adds paint absent from reference (0.005833%)
Extra	104,17 → 111,17	0.005833		candidate adds paint absent from reference (0.005833%)
Extra	167,17 → 173,17	0.005833		candidate adds paint absent from reference (0.005833%)
AntialiasCoverage	20,6 → 23,7	0.004444	ΔRGB(-118,-115,-107)	antialiasing coverage residue on a shared outline
AntialiasCoverage	82,6 → 85,7	0.004444	ΔRGB(-118,-115,-107)	antialiasing coverage residue on a shared outline
AntialiasCoverage	106,6 → 109,7	0.004444	ΔRGB(-118,-115,-107)	antialiasing coverage residue on a shared outline
AntialiasCoverage	168,6 → 172,7	0.004444	ΔRGB(-118,-115,-107)	antialiasing coverage residue on a shared outline
Extra	48,15 → 52,15	0.004167		candidate adds paint absent from reference (0.004167%)
Extra	134,15 → 138,15	0.004167		candidate adds paint absent from reference (0.004167%)
AntialiasCoverage	48,14 → 52,14	0.004167	ΔRGB(-11,-10,-10)	antialiasing coverage residue on a shared outline
AntialiasCoverage	134,14 → 138,14	0.004167	ΔRGB(-11,-10,-10)	antialiasing coverage residue on a shared outline
Missing	48,8 → 52,8	0.003889		candidate lacks paint present in reference (0.003889%)
Missing	134,8 → 138,8	0.003889		candidate lacks paint present in reference (0.003889%)
AntialiasCoverage	48,8 → 52,8	0.003889	ΔRGB(97,94,88)	antialiasing coverage residue on a shared outline
AntialiasCoverage	134,8 → 138,8	0.003889	ΔRGB(97,94,88)	antialiasing coverage residue on a shared outline
AntialiasCoverage	55,7 → 56,9	0.003611	ΔRGB(-89,-87,-81)	antialiasing coverage residue on a shared outline
AntialiasCoverage	141,7 → 142,9	0.003611	ΔRGB(-89,-87,-81)	antialiasing coverage residue on a shared outline
AntialiasCoverage	21,9 → 22,11	0.003611	ΔRGB(83,80,76)	antialiasing coverage residue on a shared outline
AntialiasCoverage	83,9 → 84,11	0.003611	ΔRGB(83,80,76)	antialiasing coverage residue on a shared outline
AntialiasCoverage	107,9 → 108,11	0.003611	ΔRGB(83,80,76)	antialiasing coverage residue on a shared outline
AntialiasCoverage	170,9 → 171,11	0.003611	ΔRGB(83,80,76)	antialiasing coverage residue on a shared outline
AntialiasCoverage	56,10 → 57,13	0.003611	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	142,10 → 143,13	0.003611	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
Missing	48,17 → 51,17	0.003333		candidate lacks paint present in reference (0.003333%)
Missing	134,17 → 137,17	0.003333		candidate lacks paint present in reference (0.003333%)
AntialiasCoverage	71,6 → 73,6	0.003056	ΔRGB(-160,-155,-145)	antialiasing coverage residue on a shared outline
AntialiasCoverage	157,6 → 160,6	0.003056	ΔRGB(-160,-155,-145)	antialiasing coverage residue on a shared outline
AntialiasCoverage	48,17 → 51,17	0.003056	ΔRGB(7,7,6)	antialiasing coverage residue on a shared outline
AntialiasCoverage	134,17 → 137,17	0.003056	ΔRGB(7,7,6)	antialiasing coverage residue on a shared outline
AntialiasCoverage	32,6 → 34,6	0.002778	ΔRGB(-160,-155,-145)	antialiasing coverage residue on a shared outline
AntialiasCoverage	60,6 → 62,6	0.002778	ΔRGB(-160,-155,-145)	antialiasing coverage residue on a shared outline
AntialiasCoverage	118,6 → 121,6	0.002778	ΔRGB(-160,-155,-145)	antialiasing coverage residue on a shared outline
AntialiasCoverage	146,6 → 148,6	0.002778	ΔRGB(-160,-155,-145)	antialiasing coverage residue on a shared outline

source · cases/paged-media/paged-margin-box-after-synthetic-weight.html

1<!doctype html>
2<html>
3<head>
4  <meta charset="utf-8">
5  <title>page margin box after synthetic weight</title>
6  <style>
7    @page {
8      size: 192px 192px;
9      margin: 32px 0 0;
10      @top-center {
11        content: "ALPHA ALPHA";
12        color: #ffffff;
13        background: #111827;
14        font-family: ParitySans;
15        font-size: 24px;
16        font-weight: normal;
17        line-height: 32px;
18      }
19    }
20    html {
21      color: #111827;
22      font-family: ParitySans;
23      line-height: 1.5;
24    }
25    * { margin: 0; box-sizing: border-box; }
26    h2 {
27      height: 24px;
28      color: #111827;
29      background: #ffd166;
30      font-size: 12px;
31      font-weight: bold;
32      line-height: 24px;
33    }
34    .body { height: 136px; background: #bfdbfe; }
35  </style>
36</head>
37<body>
38  <h2>SYNTHETIC BOLD</h2>
39  <div class="body"></div>
40</body>
41</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.71% · raw 0.71% (2007 px) paged-margin-box-styling · stylingPASS via CSS-scale observation: stable same-coordinate outline phaseAntialiasCoveragemissing 0.2%extra 0.2%ΔE 30.3

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

A top-center page margin box applies its own color, background, and font size; catches content-only margin box renderers with hard-coded text styling.

regions (161 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	77	1197	0,7 → 200,28	625	total 0.6% · largest 0.3%
Missing	46	405	76,7 → 124,20	62	total 0.2% · largest 0.03%
Extra	38	405	76,8 → 124,20	62	total 0.2% · largest 0.03%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	0,28 → 200,28	0.3	ΔRGB(-169,-56,-180)	antialiasing coverage residue on a shared outline
Missing	113,7 → 123,10	0.03		candidate lacks paint present in reference (0.03%)
Extra	113,18 → 123,20	0.03		candidate adds paint absent from reference (0.03%)
Missing	90,7 → 97,7	0.02		candidate lacks paint present in reference (0.02%)
Extra	90,20 → 97,20	0.02		candidate adds paint absent from reference (0.02%)
Missing	78,12 → 84,13	0.02		candidate lacks paint present in reference (0.02%)
Missing	115,17 → 121,19	0.02		candidate lacks paint present in reference (0.02%)
Extra	115,8 → 121,10	0.02		candidate adds paint absent from reference (0.02%)
Extra	78,14 → 84,14	0.02		candidate adds paint absent from reference (0.02%)
Missing	91,19 → 97,19	0.02		candidate lacks paint present in reference (0.02%)
Extra	91,8 → 97,9	0.02		candidate adds paint absent from reference (0.02%)
Extra	102,17 → 108,17	0.02		candidate adds paint absent from reference (0.02%)
Missing	91,12 → 97,13	0.02		candidate lacks paint present in reference (0.02%)
Extra	91,14 → 97,14	0.02		candidate adds paint absent from reference (0.02%)
Missing	103,15 → 108,16	0.01		candidate lacks paint present in reference (0.01%)
AntialiasCoverage	102,17 → 108,19	0.01	ΔRGB(-113,-44,-88)	antialiasing coverage residue on a shared outline
AntialiasCoverage	117,7 → 123,9	0.01	ΔRGB(146,57,113)	antialiasing coverage residue on a shared outline
AntialiasCoverage	90,7 → 97,7	0.01	ΔRGB(3,1,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	91,8 → 98,9	0.01	ΔRGB(-157,-62,-122)	antialiasing coverage residue on a shared outline
AntialiasCoverage	91,19 → 98,19	0.01	ΔRGB(157,62,122)	antialiasing coverage residue on a shared outline
AntialiasCoverage	91,12 → 97,13	0.01	ΔRGB(47,18,36)	antialiasing coverage residue on a shared outline
AntialiasCoverage	91,14 → 97,14	0.01	ΔRGB(-109,-43,-85)	antialiasing coverage residue on a shared outline
AntialiasCoverage	78,12 → 84,12	0.009970	ΔRGB(47,18,36)	antialiasing coverage residue on a shared outline
AntialiasCoverage	103,14 → 108,15	0.009970	ΔRGB(29,11,22)	antialiasing coverage residue on a shared outline
AntialiasCoverage	78,14 → 84,14	0.009970	ΔRGB(-109,-43,-85)	antialiasing coverage residue on a shared outline
AntialiasCoverage	105,9 → 106,12	0.006647	ΔRGB(-92,-36,-71)	antialiasing coverage residue on a shared outline
AntialiasCoverage	119,9 → 121,11	0.006647	ΔRGB(-84,-33,-66)	antialiasing coverage residue on a shared outline
AntialiasCoverage	119,17 → 121,18	0.006647	ΔRGB(118,46,92)	antialiasing coverage residue on a shared outline
Missing	104,7 → 106,7	0.005697		candidate lacks paint present in reference (0.005697%)
AntialiasCoverage	115,9 → 118,9	0.005697	ΔRGB(-131,-51,-102)	antialiasing coverage residue on a shared outline
AntialiasCoverage	115,19 → 118,19	0.005697	ΔRGB(131,51,102)	antialiasing coverage residue on a shared outline
AntialiasCoverage	113,7 → 116,7	0.005223	ΔRGB(3,1,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	124,10 → 124,13	0.005223	ΔRGB(57,22,44)	antialiasing coverage residue on a shared outline
AntialiasCoverage	124,14 → 124,17	0.005223	ΔRGB(-56,-22,-43)	antialiasing coverage residue on a shared outline
Missing	76,7 → 77,7	0.004748		candidate lacks paint present in reference (0.004748%)
Extra	109,20 → 111,20	0.004748		candidate adds paint absent from reference (0.004748%)
Extra	76,20 → 77,20	0.004748		candidate adds paint absent from reference (0.004748%)
AntialiasCoverage	84,7 → 86,7	0.004748	ΔRGB(3,1,2)	antialiasing coverage residue on a shared outline
Extra	100,20 → 101,20	0.004273		candidate adds paint absent from reference (0.004273%)
AntialiasCoverage	120,20 → 122,20	0.004273	ΔRGB(-121,-47,-94)	antialiasing coverage residue on a shared outline
Missing	84,7 → 85,7	0.003798		candidate lacks paint present in reference (0.003798%)
Extra	84,20 → 85,20	0.003798		candidate adds paint absent from reference (0.003798%)
AntialiasCoverage	99,19 → 100,20	0.003798	ΔRGB(52,20,41)	antialiasing coverage residue on a shared outline
AntialiasCoverage	109,19 → 109,20	0.003798	ΔRGB(-81,-32,-63)	antialiasing coverage residue on a shared outline
AntialiasCoverage	117,20 → 119,20	0.003798	ΔRGB(-158,-62,-122)	antialiasing coverage residue on a shared outline
AntialiasCoverage	122,18 → 123,19	0.003323	ΔRGB(-137,-54,-107)	antialiasing coverage residue on a shared outline
AntialiasCoverage	104,7 → 106,7	0.002849	ΔRGB(3,1,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	103,8 → 104,9	0.002849	ΔRGB(144,57,112)	antialiasing coverage residue on a shared outline
AntialiasCoverage	107,9 → 108,11	0.002849	ΔRGB(145,57,112)	antialiasing coverage residue on a shared outline
AntialiasCoverage	103,10 → 103,11	0.002849	ΔRGB(123,48,95)	antialiasing coverage residue on a shared outline
AntialiasCoverage	104,11 → 105,12	0.002849	ΔRGB(-84,-33,-65)	antialiasing coverage residue on a shared outline
AntialiasCoverage	108,11 → 108,12	0.002849	ΔRGB(123,48,95)	antialiasing coverage residue on a shared outline
AntialiasCoverage	122,12 → 122,13	0.002849	ΔRGB(-31,-12,-24)	antialiasing coverage residue on a shared outline
AntialiasCoverage	102,12 → 102,13	0.002849	ΔRGB(137,54,106)	antialiasing coverage residue on a shared outline
AntialiasCoverage	107,13 → 107,14	0.002849	ΔRGB(-74,-29,-58)	antialiasing coverage residue on a shared outline
AntialiasCoverage	109,13 → 109,15	0.002849	ΔRGB(135,53,105)	antialiasing coverage residue on a shared outline
AntialiasCoverage	101,15 → 101,16	0.002849	ΔRGB(149,59,116)	antialiasing coverage residue on a shared outline
AntialiasCoverage	110,16 → 110,17	0.002849	ΔRGB(147,58,114)	antialiasing coverage residue on a shared outline
AntialiasCoverage	100,16 → 100,18	0.002849	ΔRGB(128,50,100)	antialiasing coverage residue on a shared outline
AntialiasCoverage	110,18 → 111,19	0.002849	ΔRGB(125,49,97)	antialiasing coverage residue on a shared outline
AntialiasCoverage	111,19 → 111,20	0.002849	ΔRGB(19,7,14)	antialiasing coverage residue on a shared outline
AntialiasCoverage	76,7 → 77,7	0.002374	ΔRGB(3,1,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	106,7 → 107,8	0.002374	ΔRGB(133,52,103)	antialiasing coverage residue on a shared outline
AntialiasCoverage	122,14 → 122,16	0.002374	ΔRGB(68,27,54)	antialiasing coverage residue on a shared outline

source · cases/paged-media/paged-margin-box-styling.html

1<!DOCTYPE html>
2<html><head><meta charset="utf-8"><title>page margin box styling</title><style>
3@page{size:200px 144px;margin:28px 0 0 0;@top-center{content:"HEAD";color:#fff;background:#16a34a;font-size:18px}}
4html{font-family:ParitySans;line-height:1.5}
5*{margin:0;box-sizing:border-box}
6.box{height:80px;background:#bfdbfe}
7</style></head><body><div class="box"></div></body></html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.32% · raw 0.62% (1639 px) paged-margin-box-font-family-fallback · font-family-fallbackPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 0.9

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

A page-margin box skips an unavailable first family and uses the next available face in its font stack.

regions (258 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	258	1639	39,15 → 201,35	40	total 0.6% · largest 0.02%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	53,17 → 53,29	0.02	ΔRGB(-3,-3,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	132,21 → 132,32	0.01	ΔRGB(3,2,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	91,21 → 92,28	0.01	ΔRGB(3,2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	78,21 → 80,29	0.01	ΔRGB(4,3,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	64,21 → 65,29	0.01	ΔRGB(4,2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	84,21 → 84,29	0.01	ΔRGB(4,2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	156,26 → 163,28	0.01	ΔRGB(-4,-2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	68,20 → 73,21	0.009905	ΔRGB(3,2,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	113,20 → 117,22	0.009905	ΔRGB(3,2,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	43,22 → 51,22	0.009524	ΔRGB(3,3,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	72,22 → 72,29	0.009143	ΔRGB(4,3,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	116,22 → 117,29	0.009143	ΔRGB(4,3,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	91,15 → 91,22	0.008381	ΔRGB(4,3,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	188,21 → 189,26	0.008381	ΔRGB(-3,-2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	108,21 → 108,28	0.008381	ΔRGB(-2,-1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	101,21 → 101,28	0.008000	ΔRGB(3,3,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	57,29 → 62,31	0.008000	ΔRGB(-3,-2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	157,25 → 162,25	0.007619	ΔRGB(-4,-3,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	136,22 → 136,27	0.007238	ΔRGB(-3,-2,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	103,30 → 107,31	0.007238	ΔRGB(-3,-2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	138,30 → 143,31	0.006857	ΔRGB(-3,-2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	98,23 → 98,28	0.006476	ΔRGB(4,3,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	123,23 → 123,28	0.006476	ΔRGB(-3,-2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	96,22 → 96,27	0.006095	ΔRGB(-3,-2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	185,27 → 186,30	0.006095	ΔRGB(-2,-1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	131,20 → 134,21	0.005714	ΔRGB(3,2,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	125,21 → 127,24	0.005714	ΔRGB(-1,-1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	196,27 → 197,30	0.005714	ΔRGB(-3,-2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	136,28 → 138,30	0.005714	ΔRGB(-2,-2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	124,32 → 125,35	0.005714	ΔRGB(3,3,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	142,21 → 143,24	0.005333	ΔRGB(-2,-2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	57,24 → 60,26	0.005333	ΔRGB(-2,-2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	126,34 → 129,34	0.005333	ΔRGB(-3,-2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	139,21 → 142,21	0.004952	ΔRGB(-4,-3,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	196,23 → 197,26	0.004952	ΔRGB(-3,-3,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	60,24 → 63,24	0.004571	ΔRGB(-4,-2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	59,26 → 59,29	0.004571	ΔRGB(2,1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	154,27 → 155,29	0.004571	ΔRGB(-2,-1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	60,29 → 62,30	0.004571	ΔRGB(-4,-2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	100,20 → 103,20	0.004190	ΔRGB(3,2,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	107,20 → 110,20	0.004190	ΔRGB(3,2,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	57,21 → 58,23	0.004190	ΔRGB(-2,-2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	59,21 → 61,21	0.004190	ΔRGB(-3,-2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	103,27 → 104,29	0.004190	ΔRGB(1,1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	158,16 → 159,18	0.003810	ΔRGB(3,2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	162,19 → 163,21	0.003810	ΔRGB(2,2,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	171,19 → 171,21	0.003810	ΔRGB(3,2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	187,26 → 188,28	0.003810	ΔRGB(2,1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	138,27 → 139,29	0.003810	ΔRGB(1,1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	188,28 → 188,30	0.003810	ΔRGB(-3,-2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	92,31 → 95,31	0.003810	ΔRGB(-3,-2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	126,31 → 129,31	0.003810	ΔRGB(-3,-2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	57,26 → 57,29	0.003429	ΔRGB(-3,-2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	195,26 → 196,28	0.003429	ΔRGB(0,1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	155,28 → 156,29	0.003429	ΔRGB(2,2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	129,29 → 130,30	0.003429	ΔRGB(-1,-1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	192,16 → 193,18	0.003048	ΔRGB(-2,-2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	184,17 → 185,19	0.003048	ΔRGB(3,2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	183,19 → 183,20	0.003048	ΔRGB(2,2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	198,19 → 198,20	0.003048	ΔRGB(-3,-3,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	185,19 → 185,21	0.003048	ΔRGB(3,2,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	193,20 → 194,21	0.003048	ΔRGB(-1,-1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	79,20 → 81,20	0.003048	ΔRGB(-1,-1,0)	antialiasing coverage residue on a shared outline
AntialiasCoverage	198,20 → 199,22	0.003048	ΔRGB(-1,-1,0)	antialiasing coverage residue on a shared outline

source · cases/paged-media/paged-margin-box-font-family-fallback.html

1<!doctype html>
2<html lang="en">
3<head>
4  <meta charset="utf-8">
5  <title>page margin font family fallback</title>
6  <style>
7    @page {
8      size: 240px 112px;
9      margin: 48px 0 0;
10      @top-center {
11        content: "Hamburge AVW";
12        background: #f4d35e;
13        color: #102a43;
14        font-family: NoSuchParityFace, ParitySerif;
15        font-size: 20px;
16        line-height: 1;
17      }
18    }
19    * { margin: 0; box-sizing: border-box; }
20    html, body { background: #ffffff; }
21    .page-area { height: 64px; background: #d9e2ec; }
22  </style>
23</head>
24<body>
25  <div class="page-area"></div>
26</body>
27</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.54% · raw 0.55% (1553 px) paged-top-bottom-margin-boxes · top-bottom-literal-contentPASS via CSS-scale observation: conserved sub-CSS coverageMissingmissing 0.3%extra 0.3%ΔE 30.5

why: visually accepted coverage phase; raw candidate lacks paint present in reference (0.3%)

Default @top-left, @top-center, @top-right, and @bottom-center page margin boxes render literal strings; catches visual parity gaps that only cover PDF-text margin box assertions.

regions (361 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	162	875	0,0 → 199,132	32	total 0.3% · largest 0.01%
Missing	98	338	0,0 → 199,131	32	total 0.1% · largest 0.01%
Extra	101	340	0,2 → 199,132	24	total 0.1% · largest 0.009253%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
Missing	90,0 → 100,0	0.01		candidate lacks paint present in reference (0.01%)
Missing	179,0 → 188,0	0.01		candidate lacks paint present in reference (0.01%)
AntialiasCoverage	90,1 → 100,1	0.01	ΔRGB(139,139,139)	antialiasing coverage residue on a shared outline
AntialiasCoverage	179,1 → 188,1	0.01	ΔRGB(139,139,139)	antialiasing coverage residue on a shared outline
Missing	0,0 → 10,0	0.01		candidate lacks paint present in reference (0.01%)
AntialiasCoverage	0,1 → 10,1	0.01	ΔRGB(139,139,139)	antialiasing coverage residue on a shared outline
Extra	11,12 → 18,12	0.009253		candidate adds paint absent from reference (0.009253%)
AntialiasCoverage	91,121 → 97,121	0.008867	ΔRGB(139,139,139)	antialiasing coverage residue on a shared outline
Extra	90,132 → 96,132	0.007711		candidate adds paint absent from reference (0.007711%)
AntialiasCoverage	12,11 → 18,11	0.007711	ΔRGB(215,215,215)	antialiasing coverage residue on a shared outline
AntialiasCoverage	92,126 → 97,127	0.007711	ΔRGB(-103,-103,-103)	antialiasing coverage residue on a shared outline
AntialiasCoverage	192,5 → 196,6	0.007325	ΔRGB(133,133,133)	antialiasing coverage residue on a shared outline
AntialiasCoverage	92,122 → 96,123	0.007325	ΔRGB(-99,-99,-99)	antialiasing coverage residue on a shared outline
Missing	13,11 → 18,11	0.006940		candidate lacks paint present in reference (0.006940%)
Missing	91,120 → 96,120	0.006554		candidate lacks paint present in reference (0.006554%)
AntialiasCoverage	92,131 → 96,131	0.006554	ΔRGB(233,233,233)	antialiasing coverage residue on a shared outline
AntialiasCoverage	197,9 → 199,12	0.006169	ΔRGB(108,108,108)	antialiasing coverage residue on a shared outline
Missing	190,0 → 195,0	0.005783		candidate lacks paint present in reference (0.005783%)
AntialiasCoverage	190,1 → 195,1	0.005783	ΔRGB(139,139,139)	antialiasing coverage residue on a shared outline
AntialiasCoverage	5,2 → 10,2	0.005783	ΔRGB(-75,-75,-75)	antialiasing coverage residue on a shared outline
AntialiasCoverage	90,2 → 94,2	0.005783	ΔRGB(-75,-75,-75)	antialiasing coverage residue on a shared outline
AntialiasCoverage	95,2 → 100,2	0.005783	ΔRGB(-75,-75,-75)	antialiasing coverage residue on a shared outline
AntialiasCoverage	179,2 → 183,2	0.005783	ΔRGB(-75,-75,-75)	antialiasing coverage residue on a shared outline
AntialiasCoverage	184,2 → 188,2	0.005783	ΔRGB(-75,-75,-75)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,2 → 4,2	0.005398	ΔRGB(-75,-75,-75)	antialiasing coverage residue on a shared outline
Extra	6,2 → 10,2	0.005012		candidate adds paint absent from reference (0.005012%)
Extra	90,2 → 93,2	0.005012		candidate adds paint absent from reference (0.005012%)
Extra	96,2 → 100,2	0.005012		candidate adds paint absent from reference (0.005012%)
Extra	179,2 → 182,2	0.005012		candidate adds paint absent from reference (0.005012%)
Extra	185,2 → 188,2	0.005012		candidate adds paint absent from reference (0.005012%)
AntialiasCoverage	96,124 → 98,126	0.005012	ΔRGB(-55,-55,-55)	antialiasing coverage residue on a shared outline
AntialiasCoverage	92,125 → 95,125	0.005012	ΔRGB(151,151,151)	antialiasing coverage residue on a shared outline
Missing	92,131 → 96,131	0.004627		candidate lacks paint present in reference (0.004627%)
Extra	0,2 → 4,2	0.004627		candidate adds paint absent from reference (0.004627%)
Missing	92,125 → 95,125	0.004241		candidate lacks paint present in reference (0.004241%)
Extra	103,12 → 107,12	0.004241		candidate adds paint absent from reference (0.004241%)
Extra	92,127 → 95,127	0.004241		candidate adds paint absent from reference (0.004241%)
Extra	104,132 → 108,132	0.004241		candidate adds paint absent from reference (0.004241%)
AntialiasCoverage	192,2 → 195,2	0.004241	ΔRGB(-99,-99,-99)	antialiasing coverage residue on a shared outline
AntialiasCoverage	103,12 → 107,12	0.004241	ΔRGB(-128,-128,-128)	antialiasing coverage residue on a shared outline
AntialiasCoverage	97,128 → 97,130	0.004241	ΔRGB(7,7,7)	antialiasing coverage residue on a shared outline
AntialiasCoverage	104,132 → 108,132	0.004241	ΔRGB(-128,-128,-128)	antialiasing coverage residue on a shared outline
Missing	104,11 → 107,11	0.003855		candidate lacks paint present in reference (0.003855%)
Missing	105,131 → 108,131	0.003855		candidate lacks paint present in reference (0.003855%)
Extra	92,122 → 95,122	0.003855		candidate adds paint absent from reference (0.003855%)
AntialiasCoverage	192,7 → 194,7	0.003855	ΔRGB(-99,-99,-99)	antialiasing coverage residue on a shared outline
AntialiasCoverage	104,11 → 107,11	0.003855	ΔRGB(118,118,118)	antialiasing coverage residue on a shared outline
AntialiasCoverage	97,130 → 98,132	0.003855	ΔRGB(-75,-75,-75)	antialiasing coverage residue on a shared outline
AntialiasCoverage	105,131 → 108,131	0.003855	ΔRGB(118,118,118)	antialiasing coverage residue on a shared outline
Missing	192,6 → 195,6	0.003470		candidate lacks paint present in reference (0.003470%)
Extra	192,2 → 195,2	0.003470		candidate adds paint absent from reference (0.003470%)
AntialiasCoverage	196,5 → 198,6	0.003470	ΔRGB(-33,-33,-33)	antialiasing coverage residue on a shared outline
AntialiasCoverage	101,6 → 101,9	0.003470	ΔRGB(16,16,16)	antialiasing coverage residue on a shared outline
AntialiasCoverage	107,11 → 109,12	0.003470	ΔRGB(-70,-70,-70)	antialiasing coverage residue on a shared outline
AntialiasCoverage	102,126 → 102,129	0.003470	ΔRGB(16,16,16)	antialiasing coverage residue on a shared outline
AntialiasCoverage	108,131 → 110,132	0.003470	ΔRGB(-70,-70,-70)	antialiasing coverage residue on a shared outline
Extra	192,7 → 194,7	0.003084		candidate adds paint absent from reference (0.003084%)
AntialiasCoverage	107,1 → 109,2	0.003084	ΔRGB(97,97,97)	antialiasing coverage residue on a shared outline
AntialiasCoverage	100,7 → 100,9	0.003084	ΔRGB(-51,-51,-51)	antialiasing coverage residue on a shared outline
AntialiasCoverage	101,11 → 103,12	0.003084	ΔRGB(-91,-91,-91)	antialiasing coverage residue on a shared outline
AntialiasCoverage	108,121 → 110,122	0.003084	ΔRGB(97,97,97)	antialiasing coverage residue on a shared outline
AntialiasCoverage	100,127 → 101,129	0.003084	ΔRGB(-51,-51,-51)	antialiasing coverage residue on a shared outline
AntialiasCoverage	102,131 → 104,132	0.003084	ΔRGB(-91,-91,-91)	antialiasing coverage residue on a shared outline
Extra	197,12 → 199,12	0.002699		candidate adds paint absent from reference (0.002699%)

source · cases/paged-media/paged-top-bottom-margin-boxes.html

1<!DOCTYPE html>
2<html><head><meta charset="utf-8"><title>top and bottom page margin boxes</title><style>
3@page{size:200px 144px;margin:24px 0;@top-left{content:"TL"}@top-center{content:"TC"}@top-right{content:"TR"}@bottom-center{content:"BC"}}
4html{font-family:ParitySans;line-height:1.5}
5*{margin:0;box-sizing:border-box}
6.box{height:60px;background:#06d6a0}
7</style></head><body><div class="box"></div></body></html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.40% · raw 0.41% (894 px) paged-margin-box-css-string-escape · css-string-escapePASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 29.1

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

A hexadecimal CSS escape in page-margin content is decoded into its Unicode code point; catches raw string slicing that bypasses CSS tokenization.

regions (7 total; showing 7 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	894	72,14 → 126,32	306	total 0.4% · largest 0.1%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	72,14 → 88,32	0.1	ΔRGB(18,14,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	114,14 → 126,32	0.10	ΔRGB(12,9,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	77,16 → 83,25	0.06	ΔRGB(-25,-18,-3)	antialiasing coverage residue on a shared outline
AntialiasCoverage	116,23 → 124,30	0.05	ΔRGB(3,3,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	116,16 → 123,21	0.05	ΔRGB(8,5,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	99,22 → 101,22	0.007314	ΔRGB(119,88,14)	antialiasing coverage residue on a shared outline
AntialiasCoverage	99,25 → 101,25	0.007314	ΔRGB(-89,-66,-10)	antialiasing coverage residue on a shared outline

source · cases/paged-media/paged-margin-box-css-string-escape.html

1<!DOCTYPE html>
2<html lang="en">
3<head>
4<meta charset="utf-8">
5<title>CSS escape in page margin content</title>
6<style>
7  @page {
8    size: 200px 112px;
9    margin: 48px 0 0;
10    @top-center {
11      content: "A \00B7  B";
12      background: #f4d35e;
13      color: #102a43;
14      font-family: ParitySans;
15      font-size: 24px;
16      line-height: 1;
17    }
18  }
19  * { margin: 0; box-sizing: border-box; }
20  html, body { background: #ffffff; }
21  .page-area { height: 64px; background: #d9e2ec; }
22</style>
23</head>
24<body>
25  <div class="page-area"></div>
26</body>
27</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.30% · raw 0.32% (593 px) paged-named-page-margin-box · named-page-override · oracle: weasyprint · 2 pagesPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 28.5

page 1

page 2

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

A block assigned page:chapter must use the chapter @page top-center margin box instead of the default one. Both generated boxes use a page-width color band and an invisible space, isolating named-page selection from page-margin auto-width behavior and text metrics.

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	593	1,31 → 25,39	198	total 0.3% · largest 0.1%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	18,31 → 25,39	0.1	ΔRGB(-6,-6,-6)	antialiasing coverage residue on a shared outline
AntialiasCoverage	1,31 → 8,39	0.07	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	2,32 → 6,38	0.05	ΔRGB(-1,-1,-1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	11,31 → 16,35	0.04	ΔRGB(-5,-5,-5)	antialiasing coverage residue on a shared outline
AntialiasCoverage	19,32 → 24,34	0.04	ΔRGB(6,7,7)	antialiasing coverage residue on a shared outline
AntialiasCoverage	9,31 → 11,31	0.005333	ΔRGB(-16,-17,-18)	antialiasing coverage residue on a shared outline
AntialiasCoverage	9,39 → 11,39	0.002667	ΔRGB(219,234,254)	antialiasing coverage residue on a shared outline
AntialiasCoverage	15,39 → 16,39	0.002667	ΔRGB(219,234,254)	antialiasing coverage residue on a shared outline

source · cases/paged-media/paged-named-page-margin-box.html

1<!doctype html>
2<html>
3<head>
4  <meta charset="utf-8">
5  <style>
6    @page {
7      size: 160px 120px;
8      margin: 24px 0 0 0;
9      @top-center {
10        content: " ";
11        background: #1d4ed8;
12        color: #ffffff;
13        width: 160px;
14      }
15    }
16    @page chapter {
17      size: 160px 120px;
18      margin: 24px 0 0 0;
19      @top-center {
20        content: " ";
21        background: #16a34a;
22        color: #ffffff;
23        width: 160px;
24      }
25    }
26    html { font-family: ParitySans; line-height: 1.5; }
27    * { margin: 0; box-sizing: border-box; }
28    .page { width: 160px; height: 96px; background: #dbeafe; font-size: 14px; }
29    .chapter { page: chapter; background: #bbf7d0; }
30  </style>
31</head>
32<body>
33  <div class="page">one</div>
34  <div class="page chapter">two</div>
35</body>
36</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.27% · raw 0.27% (575 px) paged-first-margin-box-override · first-page-override · oracle: weasyprint · 2 pagesPASS via CSS-scale observation: sub-CSS shared-outline coverageExtraextra 0.3%

page 1

page 2

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

@page :first replaces the default top-center header on page one only; catches engines that collect margin boxes only from unselected @page rules. The WeasyPrint Paged CSS oracle is used because Chromium's print path places the same margin-box line at a different baseline than the Page 3 fixed-dimension and line-box rules.

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
Extra	1	575	0,17 → 184,17	575	total 0.3% · largest 0.3%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
Extra	0,17 → 184,17	0.3		candidate adds paint absent from reference (0.3%)

source · cases/paged-media/paged-first-margin-box-override.html

1<!DOCTYPE html>
2<html><head><meta charset="utf-8"><title>first page margin box override</title><style>
3@page{size:184px 120px;margin:20px 0 0 0;@top-center{content:"BASE"}}
4@page :first{@top-center{content:"FIRST"}}
5html{font-family:ParitySans;line-height:1.5}
6*{margin:0;box-sizing:border-box}
7.p{height:100px;background:#dbeafe}.q{height:100px;background:#bbf7d0}
8</style></head><body><div class="p"></div><div class="q"></div></body></html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.27% · raw 0.27% (575 px) paged-margin-box-page-context-text · page-context-text-cascade · oracle: weasyprint · 2 pagesPASS via CSS-scale observation: sub-CSS shared-outline coverageExtraextra 0.3%

page 1

page 2

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

Page-context font-family, font-size, and line-height inherit into margin boxes, while :first overrides the page context and the nested margin rule overrides that page text. Catches engines that resolve one document-wide margin-box text default before selecting each physical page.

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
Extra	1	575	0,18 → 184,18	575	total 0.3% · largest 0.3%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
Extra	0,18 → 184,18	0.3		candidate adds paint absent from reference (0.3%)

source · cases/paged-media/paged-margin-box-page-context-text.html

1<!doctype html>
2<html><head><meta charset="utf-8"><title>page context text cascade</title><style>
3@page {
4  size: 184px 120px;
5  margin: 20px 0 0;
6  font-family: ParitySans;
7  font-size: 16px;
8  line-height: 1.5;
9  @top-center { content: "BASE"; }
10}
11@page :first {
12  font-size: 20px;
13  @top-center { content: "FIRST"; }
14}
15html { font-family: ParitySerif; font-size: 10px; line-height: 1; }
16* { margin: 0; box-sizing: border-box; }
17.p { height: 100px; background: #dbeafe; }
18.q { height: 100px; background: #bbf7d0; }
19</style></head><body><div class="p"></div><div class="q"></div></body></html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.17% · raw 0.18% (498 px) paged-corner-margin-box-position · top-left-corner-positionPASS via CSS-scale observation: conserved sub-CSS coverageAntialiasCoveragemissing 0.1%extra 0.1%ΔE 36.6

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

@top-left-corner occupies the page corner while @top-left starts at the content edge; catches simplified top-band renderers that overlap or drop corner margin boxes.

regions (109 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	52	269	0,0 → 19,12	57	total 0.2% · largest 0.04%
Missing	28	114	0,0 → 19,12	42	total 0.08% · largest 0.03%
Extra	29	115	0,1 → 19,12	31	total 0.08% · largest 0.02%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	12,1 → 19,12	0.04	ΔRGB(-39,-39,-39)	antialiasing coverage residue on a shared outline
Missing	12,0 → 13,12	0.03		candidate lacks paint present in reference (0.03%)
AntialiasCoverage	12,1 → 12,12	0.02	ΔRGB(231,231,231)	antialiasing coverage residue on a shared outline
Extra	13,1 → 13,10	0.02		candidate adds paint absent from reference (0.02%)
Extra	12,11 → 19,12	0.02		candidate adds paint absent from reference (0.02%)
Missing	14,11 → 19,11	0.01		candidate lacks paint present in reference (0.01%)
Extra	4,12 → 7,12	0.007761		candidate adds paint absent from reference (0.007761%)
AntialiasCoverage	4,12 → 7,12	0.007761	ΔRGB(-128,-128,-128)	antialiasing coverage residue on a shared outline
Missing	4,11 → 7,11	0.007056		candidate lacks paint present in reference (0.007056%)
AntialiasCoverage	4,11 → 7,11	0.007056	ΔRGB(118,118,118)	antialiasing coverage residue on a shared outline
AntialiasCoverage	2,6 → 2,9	0.006350	ΔRGB(16,16,16)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,11 → 10,12	0.006350	ΔRGB(-70,-70,-70)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,1 → 10,2	0.005644	ΔRGB(97,97,97)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,7 → 1,9	0.005644	ΔRGB(-51,-51,-51)	antialiasing coverage residue on a shared outline
AntialiasCoverage	2,11 → 4,12	0.005644	ΔRGB(-91,-91,-91)	antialiasing coverage residue on a shared outline
AntialiasCoverage	1,2 → 2,3	0.004939	ΔRGB(78,78,78)	antialiasing coverage residue on a shared outline
AntialiasCoverage	3,10 → 4,11	0.004939	ΔRGB(139,139,139)	antialiasing coverage residue on a shared outline
AntialiasCoverage	9,2 → 10,3	0.004233	ΔRGB(-33,-33,-33)	antialiasing coverage residue on a shared outline
AntialiasCoverage	2,3 → 3,4	0.004233	ΔRGB(-49,-49,-49)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,4 → 0,5	0.004233	ΔRGB(48,48,48)	antialiasing coverage residue on a shared outline
AntialiasCoverage	2,4 → 2,6	0.004233	ΔRGB(-39,-39,-39)	antialiasing coverage residue on a shared outline
Missing	4,0 → 5,0	0.003528		candidate lacks paint present in reference (0.003528%)
Missing	6,0 → 8,0	0.003528		candidate lacks paint present in reference (0.003528%)
Extra	4,2 → 5,2	0.003528		candidate adds paint absent from reference (0.003528%)
AntialiasCoverage	4,1 → 5,1	0.003528	ΔRGB(65,65,65)	antialiasing coverage residue on a shared outline
AntialiasCoverage	6,1 → 8,1	0.003528	ΔRGB(68,68,68)	antialiasing coverage residue on a shared outline
AntialiasCoverage	3,1 → 4,1	0.003528	ΔRGB(122,122,122)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,2 → 5,2	0.003528	ΔRGB(-176,-176,-176)	antialiasing coverage residue on a shared outline
AntialiasCoverage	0,6 → 0,7	0.003528	ΔRGB(-3,-3,-3)	antialiasing coverage residue on a shared outline
Extra	7,2 → 8,2	0.002822		candidate adds paint absent from reference (0.002822%)
AntialiasCoverage	7,2 → 8,2	0.002822	ΔRGB(-98,-98,-98)	antialiasing coverage residue on a shared outline
AntialiasCoverage	1,10 → 1,10	0.002822	ΔRGB(-72,-72,-72)	antialiasing coverage residue on a shared outline
Missing	5,0 → 6,0	0.002117		candidate lacks paint present in reference (0.002117%)
Missing	3,1 → 4,1	0.002117		candidate lacks paint present in reference (0.002117%)
Missing	8,1 → 9,1	0.002117		candidate lacks paint present in reference (0.002117%)
Extra	6,2 → 6,2	0.002117		candidate adds paint absent from reference (0.002117%)
Extra	3,12 → 4,12	0.002117		candidate adds paint absent from reference (0.002117%)
Extra	8,12 → 8,12	0.002117		candidate adds paint absent from reference (0.002117%)
AntialiasCoverage	5,0 → 6,0	0.002117	ΔRGB(239,239,239)	antialiasing coverage residue on a shared outline
AntialiasCoverage	1,3 → 1,3	0.002117	ΔRGB(27,27,27)	antialiasing coverage residue on a shared outline
Missing	9,1 → 9,1	0.001411		candidate lacks paint present in reference (0.001411%)
Missing	2,1 → 2,1	0.001411		candidate lacks paint present in reference (0.001411%)
Missing	9,10 → 10,10	0.001411		candidate lacks paint present in reference (0.001411%)
Missing	8,10 → 9,10	0.001411		candidate lacks paint present in reference (0.001411%)
Missing	4,11 → 4,11	0.001411		candidate lacks paint present in reference (0.001411%)
Missing	8,11 → 8,11	0.001411		candidate lacks paint present in reference (0.001411%)
Extra	4,2 → 4,2	0.001411		candidate adds paint absent from reference (0.001411%)
Extra	8,2 → 8,2	0.001411		candidate adds paint absent from reference (0.001411%)
Extra	9,3 → 10,3	0.001411		candidate adds paint absent from reference (0.001411%)
Extra	9,12 → 10,12	0.001411		candidate adds paint absent from reference (0.001411%)
Extra	3,12 → 3,12	0.001411		candidate adds paint absent from reference (0.001411%)
Extra	9,12 → 9,12	0.001411		candidate adds paint absent from reference (0.001411%)
AntialiasCoverage	6,1 → 6,1	0.001411	ΔRGB(-7,-7,-7)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,2 → 4,2	0.001411	ΔRGB(-29,-29,-29)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,2 → 8,2	0.001411	ΔRGB(-38,-38,-38)	antialiasing coverage residue on a shared outline
AntialiasCoverage	1,4 → 1,4	0.001411	ΔRGB(103,103,103)	antialiasing coverage residue on a shared outline
AntialiasCoverage	2,9 → 2,9	0.001411	ΔRGB(105,105,105)	antialiasing coverage residue on a shared outline
AntialiasCoverage	9,10 → 10,10	0.001411	ΔRGB(165,165,165)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,11 → 9,11	0.001411	ΔRGB(187,187,187)	antialiasing coverage residue on a shared outline
AntialiasCoverage	4,11 → 4,11	0.001411	ΔRGB(183,183,183)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,11 → 8,11	0.001411	ΔRGB(166,166,166)	antialiasing coverage residue on a shared outline
Missing	3,1 → 3,1	0.000706		candidate lacks paint present in reference (0.000706%)
Missing	10,1 → 10,1	0.000706		candidate lacks paint present in reference (0.000706%)
Missing	2,2 → 2,2	0.000706		candidate lacks paint present in reference (0.000706%)

source · cases/paged-media/paged-corner-margin-box-position.html

1<!DOCTYPE html>
2<html><head><meta charset="utf-8"><title>corner page margin box position</title><style>
3@page{size:200px 144px;margin:24px;@top-left-corner{content:"C"}@top-left{content:"L"}}
4html{font-family:ParitySans;line-height:1.5}
5*{margin:0;box-sizing:border-box}
6.box{height:70px;background:#fef3c7}
7</style></head><body><div class="box"></div></body></html>

PASS exact match paged-blank-margin-box-specificity · blank-over-right-specificity · oracle: weasyprint · 4 pages

page 1

page 2

page 3

page 4

On a blank page inserted by break-after:left, the fixed-width @page :blank top-center band overrides @page :right; isolates blank-page selector specificity from non-normative text-metric differences.

PASS exact match paged-side-margin-boxes · left-right-middle · oracle: weasyprint

Empty @left-middle and @right-middle generated boxes must paint their side-margin backgrounds; catches renderers that only implement top and bottom margin boxes or suppress empty boxes.

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

PASS exact match paged-page-orientation-rotate-left · rotate-left

@page page-orientation:rotate-left rotates the rendered page after layout; catches size-only implementations that leave portrait output upright.

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

PASS exact match paged-background-named-compound-list · background-named-compound-list · 5 pages

page 1

page 2

page 3

page 4

page 5

Five complete page backgrounds exercise case-sensitive named pages, comma-separated selector lists, named-plus-spread compounds, :first specificity, unmatched named pages, and source order. Any selector, identity, or global-flattening defect changes most of at least one page. Chromium does not apply one named-plus-spread compound, so the Foundation reference materializes the standard cascade.

PASS exact match paged-background-physical-page-cascade · background-physical-page-cascade · 4 pages

page 1

page 2

page 3

page 4

Four pages expose their complete page backgrounds: :first wins over :right on page 1, a later equal-specificity :left rule wins on pages 2 and 4, and :right applies to page 3. Catches implementations that flatten selected @page backgrounds into one document-global style.

PASS exact match paged-blank-selector-background · blank-background · 4 pages

page 1

page 2

page 3

page 4

A sided break inserts a blank left page whose :blank background wins over :left, while a later non-blank left page retains its :left background. Small opaque content markers leave every physical-page background visible, catching both missing selection and selector leakage onto unrelated pages. Chromium does not insert the required sided blank page, so the Foundation reference materializes the specified four-page result.

PASS exact match paged-first-right-cascade · first-plus-right-cascade

The first page also matches :right, so declarations from @page :first and @page :right both apply; catches resolvers that pick only one pseudo-page rule.

PASS exact match paged-named-page-left-right · named-left-right · 3 pages

page 1

page 2

page 3

Named page selectors combined with :left and :right apply spread-specific margins only to matching chapter pages; catches named-only matching that drops pseudo-page selectors.

PASS exact match paged-page-selector-list-named · named-selector-list · 2 pages

page 1

page 2

A comma-separated @page selector list applies one margin rule to title and chapter named pages; catches selector classifiers that store the whole list as one page name. Chromium omits both named-list margins, so the Foundation reference materializes the specified two-page result.

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

PASS exact match paged-first-page-margin · first-page-margin · 2 pages

page 1

page 2

CSS Paged Media 3 §3.3: @page :first sets a 128px top margin on page 1 only; page 2 keeps the 32px default. The harness compares both pages on integral 300-DPI boundaries, isolating the :first cascade from fractional endpoint sampling.

PASS exact match paged-spread-left-right-margins · spread-left-right-margins · 2 pages

page 1

page 2

CSS Paged Media 3 §3.2 :left/:right spread margins: the right page has a 96px left margin and the left page a 96px right margin, while the opposite edges remain at the 32px default. The two-page assertion uses integral 300-DPI coordinates and isolates spread-selector geometry.

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

PASS exact match paged-size-jis-b4-landscape · jis-b4-landscape

@page size:jis-b4 landscape selects the named JIS B4 sheet and swaps axes; catches parsers missing the JIS keyword or orientation combination.

PASS exact match paged-size-ledger-keyword · ledger-keyword

@page size:ledger selects the 11in by 17in page box; catches page-size parsers that fall back after supporting only common sizes.

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

PASS exact match paged-bordered-tall-image-fragment · bordered-tall-image · 3 pages

page 1

page 2

page 3

A bordered tall replaced image must continue its image content and border decoration across pages; catches splitters that only handle undecorated images.

PASS exact match paged-tall-image-object-fit-fill-fragment · tall-object-fit-fill-image · 3 pages

page 1

page 2

page 3

A tall object-fit:fill image must show continued colored bands across later pages; catches renderers that treat replaced content as monolithic and clip it after page one.

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

PASS visually equivalent · no rejecting defect · thresholded evidence 0.90% · raw 0.93% (1955 px) paged-running-first-margin-box · first-page-margin-box · oracle: weasyprint · 2 pagesPASS via CSS-scale observation: one-sided sub-CSS outline coverageMissingmissing 0.2%ΔE 28.2

page 1

page 2

why: visually accepted coverage phase; raw candidate lacks paint present in reference (0.2%)

position:running() referenced from @page :first appears in the first-page header only; catches running-element support that ignores selected page margin boxes.

regions (14 total; showing 14 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	13	1649	54,0 → 125,18	238	total 0.8% · largest 0.1%
Missing	1	306	180,20 → 180,118	306	total 0.1% · largest 0.1%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
Missing	180,20 → 180,118	0.1		candidate lacks paint present in reference (0.1%)
AntialiasCoverage	73,4 → 80,13	0.1	ΔRGB(-88,-41,-8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	92,4 → 100,13	0.09	ΔRGB(-151,-69,-13)	antialiasing coverage residue on a shared outline
AntialiasCoverage	101,4 → 107,13	0.08	ΔRGB(-151,-69,-13)	antialiasing coverage residue on a shared outline
AntialiasCoverage	108,4 → 116,13	0.08	ΔRGB(-104,-48,-9)	antialiasing coverage residue on a shared outline
AntialiasCoverage	66,4 → 73,13	0.07	ΔRGB(-149,-69,-13)	antialiasing coverage residue on a shared outline
AntialiasCoverage	55,4 → 60,13	0.06	ΔRGB(-163,-75,-14)	antialiasing coverage residue on a shared outline
AntialiasCoverage	117,4 → 125,13	0.06	ΔRGB(-151,-69,-13)	antialiasing coverage residue on a shared outline
AntialiasCoverage	80,4 → 88,13	0.06	ΔRGB(-147,-68,-13)	antialiasing coverage residue on a shared outline
AntialiasCoverage	119,5 → 124,12	0.05	ΔRGB(-124,-57,-11)	antialiasing coverage residue on a shared outline
AntialiasCoverage	62,4 → 63,13	0.03	ΔRGB(-163,-75,-15)	antialiasing coverage residue on a shared outline
AntialiasCoverage	67,5 → 70,8	0.03	ΔRGB(-88,-41,-8)	antialiasing coverage residue on a shared outline
AntialiasCoverage	54,0 → 54,18	0.03	ΔRGB(-2,-49,-81)	antialiasing coverage residue on a shared outline
AntialiasCoverage	110,5 → 114,10	0.03	ΔRGB(-117,-54,-10)	antialiasing coverage residue on a shared outline

source · cases/paged-media/paged-running-first-margin-box.html

1<!DOCTYPE html>
2<html><head><meta charset="utf-8"><title>running element first page margin box</title><style>
3@page{size:180px 120px;margin:22px 0 0 0}
4@page :first{@top-center{content:element(h)}}
5html{font-family:ParitySans;line-height:1.5}
6*{margin:0;box-sizing:border-box}
7h1{position:running(h);height:18px;background:#f97316;font-size:12px}.p{height:100px;background:#dbeafe}.q{height:100px;background:#bbf7d0}
8</style></head><body><h1>FIRST HEAD</h1><div class="p"></div><div class="q"></div></body></html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.87% · raw 0.87% (1846 px) paged-element-first-except · element-first-except · oracle: weasyprint · 2 pagesPASS via CSS-scale observation: one-sided sub-CSS outline coverageMissingmissing 0.2%ΔE 33.7

page 1

page 2

why: page 2: visually accepted coverage phase; raw candidate lacks paint present in reference (0.2%)

element(head, first-except) suppresses the running element on the page where it first appears but allows it later; catches parsers that only support element(name).

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	11	1540	58,0 → 121,18	233	total 0.7% · largest 0.1%
Missing	1	306	180,20 → 180,118	306	total 0.1% · largest 0.1%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
Missing	180,20 → 180,118	0.1		candidate lacks paint present in reference (0.1%)
AntialiasCoverage	67,4 → 74,13	0.1	ΔRGB(-90,-74,-36)	antialiasing coverage residue on a shared outline
AntialiasCoverage	76,4 → 83,13	0.1	ΔRGB(-165,-135,-66)	antialiasing coverage residue on a shared outline
AntialiasCoverage	89,4 → 96,13	0.09	ΔRGB(-155,-127,-62)	antialiasing coverage residue on a shared outline
AntialiasCoverage	98,4 → 103,13	0.08	ΔRGB(-155,-127,-62)	antialiasing coverage residue on a shared outline
AntialiasCoverage	104,4 → 113,13	0.08	ΔRGB(-104,-85,-41)	antialiasing coverage residue on a shared outline
AntialiasCoverage	59,4 → 66,13	0.07	ΔRGB(-153,-126,-61)	antialiasing coverage residue on a shared outline
AntialiasCoverage	114,4 → 121,13	0.06	ΔRGB(-152,-125,-61)	antialiasing coverage residue on a shared outline
AntialiasCoverage	115,5 → 120,12	0.05	ΔRGB(-126,-104,-51)	antialiasing coverage residue on a shared outline
AntialiasCoverage	60,5 → 63,8	0.03	ΔRGB(-90,-74,-36)	antialiasing coverage residue on a shared outline
AntialiasCoverage	58,0 → 58,18	0.03	ΔRGB(0,-16,-53)	antialiasing coverage residue on a shared outline
AntialiasCoverage	107,5 → 110,10	0.03	ΔRGB(-108,-89,-44)	antialiasing coverage residue on a shared outline

source · cases/paged-media/paged-element-first-except.html

1<!DOCTYPE html>
2<html><head><meta charset="utf-8"><title>element first-except margin header</title><style>
3@page{size:180px 120px;margin:22px 0 0 0;@top-center{content:element(head, first-except)}}
4html{font-family:ParitySans;line-height:1.5}
5*{margin:0;box-sizing:border-box}
6h2{position:running(head);height:18px;background:#ffd166;font-size:12px}.p{height:100px;background:#dbeafe}.q{height:100px;background:#bbf7d0}
7</style></head><body><h2>RUN HEAD</h2><div class="p"></div><div class="q"></div></body></html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.86% · raw 0.86% (1862 px) paged-running-named-page-margin-box · named-page-margin-box · 2 pagesPASS via CSS-scale observation: one-sided sub-CSS outline coverageExtraextra 0.2%ΔE 36.2

page 1

page 2

why: page 2: visually accepted coverage phase; raw candidate adds paint absent from reference (0.2%)

position:running() referenced from a named @page chapter margin box appears only on chapter pages and retains the heading's explicitly authored bold weight. Chromium does not implement GCPM element(), so the Foundation-Chromium reference materializes the same complete styled running box with literal margin content.

regions (49 total; showing 49 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	48	1569	45,4 → 138,13	186	total 0.7% · largest 0.09%
Extra	1	293	45,18 → 139,18	293	total 0.1% · largest 0.1%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
Extra	45,18 → 139,18	0.1		candidate adds paint absent from reference (0.1%)
AntialiasCoverage	115,4 → 130,13	0.09	ΔRGB(-46,-37,-18)	antialiasing coverage residue on a shared outline
AntialiasCoverage	62,4 → 71,13	0.07	ΔRGB(21,18,9)	antialiasing coverage residue on a shared outline
AntialiasCoverage	95,7 → 100,13	0.03	ΔRGB(-32,-27,-13)	antialiasing coverage residue on a shared outline
AntialiasCoverage	131,9 → 138,13	0.03	ΔRGB(-89,-72,-35)	antialiasing coverage residue on a shared outline
AntialiasCoverage	71,4 → 80,6	0.02	ΔRGB(59,49,24)	antialiasing coverage residue on a shared outline
AntialiasCoverage	45,9 → 52,13	0.02	ΔRGB(-90,-74,-36)	antialiasing coverage residue on a shared outline
AntialiasCoverage	45,4 → 52,7	0.02	ΔRGB(107,88,43)	antialiasing coverage residue on a shared outline
AntialiasCoverage	131,4 → 138,7	0.02	ΔRGB(147,120,58)	antialiasing coverage residue on a shared outline
AntialiasCoverage	65,6 → 68,10	0.02	ΔRGB(-24,-19,-9)	antialiasing coverage residue on a shared outline
AntialiasCoverage	124,6 → 126,10	0.02	ΔRGB(-24,-19,-9)	antialiasing coverage residue on a shared outline
AntialiasCoverage	47,5 → 52,8	0.02	ΔRGB(-108,-89,-44)	antialiasing coverage residue on a shared outline
AntialiasCoverage	73,5 → 76,8	0.02	ΔRGB(24,19,9)	antialiasing coverage residue on a shared outline
AntialiasCoverage	47,9 → 52,12	0.02	ΔRGB(110,90,44)	antialiasing coverage residue on a shared outline
AntialiasCoverage	95,5 → 98,8	0.02	ΔRGB(4,4,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	86,13 → 92,13	0.02	ΔRGB(-89,-72,-35)	antialiasing coverage residue on a shared outline
AntialiasCoverage	132,5 → 136,8	0.02	ΔRGB(-90,-74,-36)	antialiasing coverage residue on a shared outline
AntialiasCoverage	93,4 → 99,6	0.02	ΔRGB(147,120,58)	antialiasing coverage residue on a shared outline
AntialiasCoverage	73,7 → 77,10	0.02	ΔRGB(-89,-72,-35)	antialiasing coverage residue on a shared outline
AntialiasCoverage	132,9 → 136,12	0.02	ΔRGB(90,74,36)	antialiasing coverage residue on a shared outline
AntialiasCoverage	88,5 → 92,5	0.01	ΔRGB(-90,-74,-36)	antialiasing coverage residue on a shared outline
AntialiasCoverage	116,5 → 121,5	0.01	ΔRGB(-90,-74,-36)	antialiasing coverage residue on a shared outline
AntialiasCoverage	88,12 → 92,12	0.01	ΔRGB(166,137,67)	antialiasing coverage residue on a shared outline
AntialiasCoverage	116,12 → 121,12	0.01	ΔRGB(166,137,67)	antialiasing coverage residue on a shared outline
AntialiasCoverage	88,7 → 92,8	0.01	ΔRGB(166,137,67)	antialiasing coverage residue on a shared outline
AntialiasCoverage	116,7 → 120,8	0.01	ΔRGB(166,137,67)	antialiasing coverage residue on a shared outline
AntialiasCoverage	88,9 → 92,9	0.01	ΔRGB(-89,-72,-35)	antialiasing coverage residue on a shared outline
AntialiasCoverage	116,9 → 120,9	0.01	ΔRGB(-89,-72,-35)	antialiasing coverage residue on a shared outline
AntialiasCoverage	77,4 → 85,4	0.01	ΔRGB(255,209,102)	antialiasing coverage residue on a shared outline
AntialiasCoverage	56,7 → 59,8	0.01	ΔRGB(166,137,67)	antialiasing coverage residue on a shared outline
AntialiasCoverage	107,7 → 111,8	0.01	ΔRGB(166,137,67)	antialiasing coverage residue on a shared outline
AntialiasCoverage	56,9 → 59,9	0.01	ΔRGB(-89,-72,-35)	antialiasing coverage residue on a shared outline
AntialiasCoverage	107,9 → 111,9	0.01	ΔRGB(-89,-72,-35)	antialiasing coverage residue on a shared outline
AntialiasCoverage	82,5 → 85,5	0.009426	ΔRGB(-90,-74,-36)	antialiasing coverage residue on a shared outline
AntialiasCoverage	86,4 → 92,4	0.008955	ΔRGB(255,209,102)	antialiasing coverage residue on a shared outline
AntialiasCoverage	115,4 → 121,4	0.008955	ΔRGB(255,209,102)	antialiasing coverage residue on a shared outline
AntialiasCoverage	60,13 → 61,13	0.005656	ΔRGB(-89,-72,-35)	antialiasing coverage residue on a shared outline
AntialiasCoverage	111,13 → 113,13	0.005656	ΔRGB(-89,-72,-35)	antialiasing coverage residue on a shared outline
AntialiasCoverage	54,13 → 55,13	0.004713	ΔRGB(-89,-72,-35)	antialiasing coverage residue on a shared outline
AntialiasCoverage	71,13 → 73,13	0.004713	ΔRGB(-89,-72,-35)	antialiasing coverage residue on a shared outline
AntialiasCoverage	81,13 → 82,13	0.004713	ΔRGB(-89,-72,-35)	antialiasing coverage residue on a shared outline
AntialiasCoverage	93,13 → 95,13	0.004713	ΔRGB(-89,-72,-35)	antialiasing coverage residue on a shared outline
AntialiasCoverage	106,13 → 107,13	0.004713	ΔRGB(-89,-72,-35)	antialiasing coverage residue on a shared outline
AntialiasCoverage	60,4 → 61,4	0.002828	ΔRGB(255,209,102)	antialiasing coverage residue on a shared outline
AntialiasCoverage	111,4 → 113,4	0.002828	ΔRGB(255,209,102)	antialiasing coverage residue on a shared outline
AntialiasCoverage	54,4 → 55,4	0.002357	ΔRGB(255,209,102)	antialiasing coverage residue on a shared outline
AntialiasCoverage	106,4 → 107,4	0.002357	ΔRGB(255,209,102)	antialiasing coverage residue on a shared outline
AntialiasCoverage	47,8 → 47,9	0.001885	ΔRGB(43,35,17)	antialiasing coverage residue on a shared outline
AntialiasCoverage	45,7 → 45,7	0.000943	ΔRGB(58,47,23)	antialiasing coverage residue on a shared outline

source · cases/paged-media/paged-running-named-page-margin-box.html

1<!DOCTYPE html>
2<html><head><meta charset="utf-8"><title>running element named page margin box</title><style>
3@page{size:184px 120px;margin:0}
4@page chapter{size:184px 120px;margin:22px 0 0 0;@top-center{content:element(ch)}}
5html{font-family:ParitySans;line-height:1.5}
6*{margin:0;box-sizing:border-box}
7.cover{height:120px;background:#1d4ed8}h2{position:running(ch);height:18px;font-size:12px;font-weight:700;background:#ffd166}.body{page:chapter;height:100px;background:#16a34a}
8</style></head><body><div class="cover"></div><section class="body"><h2>CHAPTER HEAD</h2></section></body></html>

PASS exact match running-element-header · position-running · oracle: weasyprint

CSS GCPM running elements: position:running(runhead) removes a sized, painted box from normal flow and element(runhead) places that exact box in @top-center. The gold flow probe must start at the content top; this avoids text-metric noise and directly checks moved-box geometry. Validated against WeasyPrint because Chrome --print-to-pdf does not implement GCPM running elements.

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

PASS visually equivalent · no rejecting defect · thresholded evidence 0.50% · raw 0.52% (1511 px) paged-gcpm-string-element-last · string-last-element-last · oracle: weasyprintPASS via CSS-scale observation: sub-CSS shared-colour coverageAntialiasCoverageΔE 27.2

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

string(section,last) and element(head,last) in page margin boxes must use the last heading on the page; catches GCPM implementations that ignore named strings or only support element(name)'s default selection.

regions (11 total; showing 11 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	11	1511	0,7 → 29,81	479	total 0.6% · largest 0.2%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
AntialiasCoverage	0,7 → 19,16	0.2	ΔRGB(-111,-90,-44)	antialiasing coverage residue on a shared outline
AntialiasCoverage	15,69 → 21,79	0.08	ΔRGB(3,4,4)	antialiasing coverage residue on a shared outline
AntialiasCoverage	23,72 → 29,81	0.08	ΔRGB(1,1,1)	antialiasing coverage residue on a shared outline
AntialiasCoverage	8,72 → 14,79	0.07	ΔRGB(-2,-2,-2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	2,72 → 7,79	0.06	ΔRGB(2,2,2)	antialiasing coverage residue on a shared outline
AntialiasCoverage	19,7 → 27,16	0.05	ΔRGB(-90,-74,-36)	antialiasing coverage residue on a shared outline
AntialiasCoverage	21,8 → 27,15	0.05	ΔRGB(-90,-74,-36)	antialiasing coverage residue on a shared outline
AntialiasCoverage	26,8 → 28,15	0.01	ΔRGB(43,36,18)	antialiasing coverage residue on a shared outline
AntialiasCoverage	1,69 → 2,70	0.003249	ΔRGB(-76,-88,-102)	antialiasing coverage residue on a shared outline
AntialiasCoverage	1,79 → 2,79	0.001624	ΔRGB(191,219,254)	antialiasing coverage residue on a shared outline
AntialiasCoverage	21,13 → 21,14	0.000812	ΔRGB(18,14,7)	antialiasing coverage residue on a shared outline

source · cases/paged-media/paged-gcpm-string-element-last.html

1<!doctype html>
2<html>
3<head>
4  <meta charset="utf-8">
5  <style>
6    @page {
7      size: 200px 150px;
8      margin: 24px 0 0 0;
9      @top-left {
10        content: string(section, last);
11        background: #1d4ed8;
12        color: #ffffff;
13      }
14      @top-right {
15        content: element(head, last);
16        background: #16a34a;
17        color: #ffffff;
18      }
19    }
20    html { font-family: ParitySans; line-height: 1.5; }
21    * { margin: 0; box-sizing: border-box; }
22    h2 {
23      position: running(head);
24      string-set: section content();
25      width: 200px;
26      height: 18px;
27      font-size: 12px;
28      line-height: 18px;
29      background: #ffd166;
30    }
31    .spacer { width: 200px; height: 42px; background: #e5e7eb; }
32    p { width: 200px; height: 60px; background: #bfdbfe; font-size: 12px; }
33  </style>
34</head>
35<body>
36  <h2>ONE</h2>
37  <div class="spacer"></div>
38  <h2>TWO</h2>
39  <p>body</p>
40</body>
41</html>

PASS visually equivalent · no rejecting defect · thresholded evidence 0.36% · raw 0.37% (950 px) paged-string-set-attr-start · string-set-attr-start · 2 pagesPASS via CSS-scale observation: conserved sub-CSS coverageExtramissing 0.5%extra 0.5%ΔE 25.3

page 1

page 2

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

string-set with attr() feeds string(section,start) in the page header when the assigning heading starts page 1, and the entry value continues on page 2. Chromium does not implement GCPM string-set, so the Foundation-Chromium reference materializes the required ALPHA margin content while preserving the same pagination.

regions (231 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	79	183	69,0 → 122,11	18	total 0.3% · largest 0.02%
ColorErr	96	584	69,0 → 122,12	21	total 0.8% · largest 0.03%
Extra	56	183	69,2 → 122,12	24	total 0.3% · largest 0.03%

Representative region details (worst-first)

class	bbox (CSS px)	area%	magnitude	reason
Extra	82,12 → 89,12	0.03		candidate adds paint absent from reference (0.03%)
AntialiasCoverage	102,5 → 108,5	0.03	ΔRGB(123,123,123)	antialiasing coverage residue on a shared outline
AntialiasCoverage	102,6 → 108,6	0.03	ΔRGB(-91,-91,-91)	antialiasing coverage residue on a shared outline
AntialiasCoverage	72,9 → 77,9	0.03	ΔRGB(-87,-87,-87)	antialiasing coverage residue on a shared outline
AntialiasCoverage	114,9 → 119,9	0.03	ΔRGB(-87,-87,-87)	antialiasing coverage residue on a shared outline
AntialiasCoverage	73,7 → 77,8	0.03	ΔRGB(139,139,139)	antialiasing coverage residue on a shared outline
AntialiasCoverage	114,7 → 118,8	0.03	ΔRGB(139,139,139)	antialiasing coverage residue on a shared outline
AntialiasCoverage	84,10 → 89,11	0.03	ΔRGB(215,215,215)	antialiasing coverage residue on a shared outline
Missing	84,10 → 89,10	0.02		candidate lacks paint present in reference (0.02%)
Missing	102,5 → 108,5	0.02		candidate lacks paint present in reference (0.02%)
Extra	102,6 → 108,6	0.02		candidate adds paint absent from reference (0.02%)
Extra	72,9 → 77,9	0.02		candidate adds paint absent from reference (0.02%)
Extra	114,9 → 119,9	0.02		candidate adds paint absent from reference (0.02%)
AntialiasCoverage	92,7 → 97,7	0.02	ΔRGB(-167,-167,-167)	antialiasing coverage residue on a shared outline
Missing	91,0 → 96,0	0.02		candidate lacks paint present in reference (0.02%)
AntialiasCoverage	91,0 → 96,0	0.02	ΔRGB(139,139,139)	antialiasing coverage residue on a shared outline
Missing	73,7 → 76,7	0.02		candidate lacks paint present in reference (0.02%)
Missing	115,7 → 118,7	0.02		candidate lacks paint present in reference (0.02%)
AntialiasCoverage	92,1 → 95,2	0.02	ΔRGB(-99,-99,-99)	antialiasing coverage residue on a shared outline
AntialiasCoverage	92,6 → 95,6	0.02	ΔRGB(75,75,75)	antialiasing coverage residue on a shared outline
Extra	93,7 → 96,7	0.01		candidate adds paint absent from reference (0.01%)
AntialiasCoverage	74,0 → 76,1	0.01	ΔRGB(139,139,139)	antialiasing coverage residue on a shared outline
AntialiasCoverage	115,0 → 117,1	0.01	ΔRGB(139,139,139)	antialiasing coverage residue on a shared outline
AntialiasCoverage	97,1 → 98,3	0.01	ΔRGB(86,86,86)	antialiasing coverage residue on a shared outline
AntialiasCoverage	73,4 → 74,6	0.01	ΔRGB(-82,-82,-82)	antialiasing coverage residue on a shared outline
AntialiasCoverage	115,4 → 116,6	0.01	ΔRGB(-82,-82,-82)	antialiasing coverage residue on a shared outline
Missing	93,6 → 95,6	0.01		candidate lacks paint present in reference (0.01%)
Extra	93,2 → 95,2	0.01		candidate adds paint absent from reference (0.01%)
AntialiasCoverage	97,3 → 97,4	0.01	ΔRGB(7,7,7)	antialiasing coverage residue on a shared outline
AntialiasCoverage	97,5 → 98,6	0.01	ΔRGB(-22,-22,-22)	antialiasing coverage residue on a shared outline
AntialiasCoverage	72,3 → 73,4	0.009642	ΔRGB(67,67,67)	antialiasing coverage residue on a shared outline
AntialiasCoverage	114,3 → 115,4	0.009642	ΔRGB(67,67,67)	antialiasing coverage residue on a shared outline
AntialiasCoverage	78,6 → 78,7	0.009642	ΔRGB(65,65,65)	antialiasing coverage residue on a shared outline
AntialiasCoverage	119,6 → 120,7	0.009642	ΔRGB(65,65,65)	antialiasing coverage residue on a shared outline
AntialiasCoverage	70,9 → 70,11	0.009642	ΔRGB(63,63,63)	antialiasing coverage residue on a shared outline
AntialiasCoverage	111,9 → 112,11	0.009642	ΔRGB(63,63,63)	antialiasing coverage residue on a shared outline
Missing	74,0 → 76,0	0.008264		candidate lacks paint present in reference (0.008264%)
Missing	108,0 → 109,0	0.008264		candidate lacks paint present in reference (0.008264%)
Missing	116,0 → 117,0	0.008264		candidate lacks paint present in reference (0.008264%)
Extra	69,12 → 71,12	0.008264		candidate adds paint absent from reference (0.008264%)
Extra	78,12 → 80,12	0.008264		candidate adds paint absent from reference (0.008264%)
Extra	91,12 → 92,12	0.008264		candidate adds paint absent from reference (0.008264%)
Extra	100,12 → 102,12	0.008264		candidate adds paint absent from reference (0.008264%)
Extra	108,12 → 109,12	0.008264		candidate adds paint absent from reference (0.008264%)
Extra	111,12 → 113,12	0.008264		candidate adds paint absent from reference (0.008264%)
Extra	120,12 → 122,12	0.008264		candidate adds paint absent from reference (0.008264%)
AntialiasCoverage	108,0 → 109,0	0.008264	ΔRGB(139,139,139)	antialiasing coverage residue on a shared outline
AntialiasCoverage	76,1 → 76,2	0.008264	ΔRGB(87,87,87)	antialiasing coverage residue on a shared outline
AntialiasCoverage	117,1 → 118,2	0.008264	ΔRGB(87,87,87)	antialiasing coverage residue on a shared outline
AntialiasCoverage	75,2 → 75,2	0.008264	ΔRGB(-74,-74,-74)	antialiasing coverage residue on a shared outline
AntialiasCoverage	116,2 → 116,2	0.008264	ΔRGB(-74,-74,-74)	antialiasing coverage residue on a shared outline
AntialiasCoverage	75,3 → 76,4	0.008264	ΔRGB(-79,-79,-79)	antialiasing coverage residue on a shared outline
AntialiasCoverage	117,3 → 117,4	0.008264	ΔRGB(-79,-79,-79)	antialiasing coverage residue on a shared outline
AntialiasCoverage	99,3 → 99,4	0.008264	ΔRGB(14,14,14)	antialiasing coverage residue on a shared outline
AntialiasCoverage	77,3 → 77,4	0.008264	ΔRGB(93,93,93)	antialiasing coverage residue on a shared outline
AntialiasCoverage	118,3 → 119,4	0.008264	ΔRGB(93,93,93)	antialiasing coverage residue on a shared outline
AntialiasCoverage	72,4 → 72,5	0.008264	ΔRGB(88,88,88)	antialiasing coverage residue on a shared outline
AntialiasCoverage	114,4 → 114,5	0.008264	ΔRGB(88,88,88)	antialiasing coverage residue on a shared outline
AntialiasCoverage	76,5 → 76,6	0.008264	ΔRGB(-72,-72,-72)	antialiasing coverage residue on a shared outline
AntialiasCoverage	118,5 → 118,6	0.008264	ΔRGB(-72,-72,-72)	antialiasing coverage residue on a shared outline
AntialiasCoverage	71,7 → 71,8	0.008264	ΔRGB(93,93,93)	antialiasing coverage residue on a shared outline
AntialiasCoverage	113,7 → 113,8	0.008264	ΔRGB(93,93,93)	antialiasing coverage residue on a shared outline
AntialiasCoverage	78,7 → 79,9	0.008264	ΔRGB(88,88,88)	antialiasing coverage residue on a shared outline
AntialiasCoverage	120,7 → 120,9	0.008264	ΔRGB(88,88,88)	antialiasing coverage residue on a shared outline

source · cases/paged-media/paged-string-set-attr-start.html

1<!DOCTYPE html>
2<html><head><meta charset="utf-8"><title>string-set attr start margin header</title><style>
3@page{size:192px 136px;margin:24px 0 0 0;@top-center{content:string(section,start);font-weight:400}}
4html{font-family:ParitySans;line-height:1.5}
5*{margin:0;box-sizing:border-box}
6h2{string-set:section attr(data-title);height:20px;background:#ffd166;font-size:12px;font-weight:700}.body{height:100px;background:#bfdbfe;break-before:page}
7</style></head><body><h2 data-title="ALPHA">ignored text</h2><div class="body"></div></body></html>

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

PASS exact match paged-table-header-footer-repeat · repeat-header-footer · 2 pages

page 1

page 2

A paginated table must repeat the thead and tfoot bands on each page fragment; integer-raster page geometry catches table splitting that fragments rows but forgets header/footer group repetition.