Inspect the CSS comparison

This maintainer-run comparison tests the published Fullbleed 2.5.14 Linux wheel against the independent IronPress corpus at commit 0d1e53b6d8174d0a5059a8696c24e62759381f6d. The corpus contains 1,662 HTML/CSS fixtures and committed reference PDFs: 1,629 Chromium references and 33 WeasyPrint references. Each fixture identifies its reference renderer; this run uses those pinned PDFs rather than launching current browser or WeasyPrint versions.

The full run completed with 1,616 PASS, 27 FAIL, and 19 REFERENCE-DISPUTED across 1,662 fixtures.

Verdict	Fixtures
PASS	1,616
FAIL	27
REFERENCE-DISPUTED	19
Total	1,662

The unchanged upstream gate failed (process exit 101). It records 27 failing fixtures. Its 799 gate entries also include changes relative to the committed IronPress baseline; several entries can refer to the same fixture. All reasons remain in the raw report.

The upstream gate also checks its committed IronPress raster baseline. A changed fingerprint can fail that regression check even when the fixture's visibility verdict is PASS. The run retains this gate result and its reasons alongside the fixture verdicts; the baseline is not rewritten for this comparison.

Read the verdicts

• PASS means the fixture meets the upstream visibility policy. It does not necessarily mean pixel-identical output. Raw differences remain in the report.
• FAIL means the candidate failed the comparator or a rendering check.
• REFERENCE-DISPUTED means a visible mismatch against a reference tagged as disputed by the upstream corpus. These verdicts are not counted as passes. The reference dispute does not establish that Fullbleed renders the case correctly.

The corpus marks 20 reference PDFs as disputed. In this run, 19 receive REFERENCE-DISPUTED verdicts and one receives PASS under the unchanged comparator. That PASS does not resolve the reference's standards dispute. The raw JSON retains both the verdict and reference metadata. The passing tagged case is interactions/interactions-cartesian-effects-x-paged-media.

The same Poppler pdftoppm 24.08.0 executable rasterizes both sides. The upstream comparator compares the same coordinates without moving one image to fit the other. Fixtures, reference PDFs, comparator source, and thresholds are unchanged; the integration substitutes Fullbleed at the candidate-renderer boundary.

Of the 1,662 fixtures, 858 have identical candidate and reference page raster fingerprints. This compares raster dimensions and RGBA hashes, not PDF file bytes. The remaining cases retain their measured differences and individual verdicts in the report.

Inspect the evidence

Download the complete evidence (50.0 MiB) · Structured summary · SHA-256 checksums

Open ironpress-evidence/current/reports/index.html in the downloaded archive. The unmodified upstream report retains IronPress headings and candidate labels; its candidate is Fullbleed in this run. The archive includes candidate PDFs, reference and candidate page images, difference images, and the raw JSON report. The upstream MIT license and font notices are retained. Category pages initially show non-PASS cases; select show PASS to inspect passing fixtures too.

fullbleed-run.json identifies the wheel, runner, adapter, patch, dependency lock, container image, and invocation. manifest.json records each exported file's SHA-256. The wrapper verifies a complete, unique fixture inventory and checks that the JSON, Markdown, and HTML identify the same invocation and JSON digest.

Example of a failing fixture

border-image-intrinsic-overlap-reset fails with a 4.30% above-floor page difference. The repeated border-image patterns differ visibly. These are unmodified page images from the retained report; open an image to inspect it at full size.

Chromium reference

Fullbleed 2.5.14

Above-floor difference

Image provenance and hashes | Upstream MIT license. All failing cases remain in the complete report.

Results by category

These are fixture counts within this corpus, not percentages of the CSS standard.

Category	PASS	FAIL	Disputed
backgrounds-borders	79	3	1
backgrounds-gradients	46	0	0
block-box-model	59	0	0
clip-mask	52	0	0
color-opacity	49	0	1
effects	57	2	1
filters	46	0	1
flexbox	132	0	0
fonts-advanced	25	1	0
generated-content	33	2	2
grid	95	1	0
images-replaced	38	0	0
inline-text	45	4	1
interactions	350	10	2
lists-counters	34	0	1
multicol	36	0	0
overflow-clipping	17	0	3
paged-media	82	2	3
positioning	22	0	0
probes	6	0	0
selectors-cascade	60	0	0
tables	97	1	1
text-advanced	47	0	2
transforms	44	0	0
typography	23	1	0
units-values	42	0	0

Failing fixtures

The raw report retains the diagnostics and images for every failing case.

• backgrounds-borders/border-image-fill-axis-repeat
• backgrounds-borders/border-image-intrinsic-overlap-reset
• backgrounds-borders/border-image-round-horizontal
• effects/r2-box-shadow-inset-blur-radius
• effects/r2-text-shadow-blur-rgba
• fonts-advanced/fonts-advanced-font-synthesis-none
• generated-content/generated-content-counters-nested
• generated-content/generated-content-no-open-quote-depth
• grid/grid-display-contents-fragmentation-text-survival
• inline-text/inline-text-decoration-subpoint-geometry
• inline-text/inline-text-text-decoration-line-through
• inline-text/inline-text-text-decoration-overline
• inline-text/inline-text-text-decoration-color
• interactions/interactions-grid-fragmentation-svg-background-single-owner
• interactions/interactions-cartesian-backgrounds-borders-x-effects
• interactions/interactions-cartesian-block-box-model-x-clip-mask
• interactions/interactions-cartesian-clip-mask-x-clip-mask
• interactions/interactions-cartesian-clip-mask-x-tables
• interactions/interactions-cartesian-effects-x-overflow-clipping
• interactions/interactions-cartesian-effects-x-page-margins
• interactions/interactions-cartesian-filters-x-overflow-clipping
• interactions/interactions-cartesian-filters-x-paged-media
• interactions/interactions-transforms-x-font-synthesis-matrix
• paged-media/paged-footnote-counter-reset
• paged-media/paged-string-set-attr-start
• tables/tables-cell-generated-before-child
• typography/typography-font-weight-bold

Disputed references

These 19 REFERENCE-DISPUTED verdicts remain separate from the PASS count. The reference metadata is retained for every fixture, including the passing tagged case described above.

• background-clip-text-gradient
• opacity-text-glyph-group
• r2-mix-blend-mode-text-difference
• r2-filter-url-feturbulence-displacement
• generated-content-first-letter-dropcap
• generated-content-string-set-running-header
• inline-text-text-decoration-wavy
• interactions-cartesian-page-margins-x-paged-media
• interactions-cartesian-positioning-x-tables
• lists-counters-marker-side-match-parent
• overflow-axis-visible-hidden-coercion
• overflow-scroll-print-clip
• overflow-x-y-separate
• footnote-float
• paged-footnote-display-compact
• paged-footnote-max-height
• tables-colspan-max-clamp
• text-advanced-text-combine-upright-center
• text-advanced-text-combine-upright-digits

Reproduce and evaluate your templates

Follow the pinned runner instructions to use the same corpus and adapter. The retained workflow run records the execution.

The corpus runner needs Git, Docker, and a compatible Linux wheel. Its container and external rasterizer are test tools, not dependencies of pip install fullbleed. Cargo dependencies are locked separately for the upstream comparator. The actual container image is recorded; operating-system packages are not a byte-identical environment lock.

A corpus result applies to its exact engine version, fixtures, fonts, references, and comparison policy. It does not establish support for all CSS, browser JavaScript, arbitrary web pages, accessibility standards, or PDF conformance. Test your own templates with representative data and explicit fonts.

See CSS coverage for documented behavior and boundaries, or the shared-document renderer comparison for PDFs and timings from three application-style documents. That comparison uses different versions and inputs; its results should not be combined with this corpus run.