Open more CSS WPT reftests in the rig: monospace font, named colors, display values and elements

[skyturkish]

Summary

Rig-side changes that came up while fixing the CSS WPT reftests in the engine (engine PR: geastack/core#59). The rig now runs 157 tests it used to skip (SKIP 603 → 446).

Commit	Change	Why
8617f81	Normalize named colors inside border-image / border-image-source gradients	The engine parses hex, rgb() and transparent only; the rig already rewrote named colors in other color-bearing properties
53a06d5	Load a pinned monospace font: DejaVu Sans Mono 2.35, unmodified, SHA-256 checked, license in test/wpt/fonts/LICENSE-DejaVu.txt	Upstream pins no monospace font, so monospace fell back to Gentium and broke lines sized in ch; 4 tests depend on it
4065618	Transport display: flow-root, list-item, inline-flex, inline-grid	17 tests
a941f1b	Transport display: inline and inline-block	77 tests
8e4ee84	Transport strong, aside, article and unknown elements; UA rules for strong (bold) and flexbox/grid/container/item (inline, as HTMLUnknownElement)	63 tests

adapter.test.mjs now uses display: table as its example of an unsupported declaration, since inline-block is supported.

Results

"Now" is this PR plus geastack/core#59 (8e4ee84 + dea97af), a full 1,100-case run:

	PASS	FAIL	BLOCKED	SKIP	ERROR
Start: core e6115c3, rig main (497 tests run)	433	62	1	603	1
Now: the same 497 tests	497	0	0	603	0
Now: the 157 tests this PR un-skips	105	52	0	–	0
Now: all 1,100 cases	602	52	0	446	0

• All 64 tests that did not pass at the start now pass. 5 of them need this PR: border-image-outset-003 (8617f81) and line-clamp/block-ellipsis-023, -024, -034, -037 (53a06d5).
• The 52 remaining fails are all in the 157 un-skipped tests; the largest group is vertical writing modes (24).

Notes

• <b> is deliberately not transported. With its UA bold rule, one glyph's coverage changed (400 px) in vlr-ltr-rtl-in-multicols and vrl-ltr-rtl-in-multicols, which do not use <b>; layout was identical. I did not find the cause. Each test runs in its own WASM instance, so it is not state carried over from an earlier test.
• Against core main, most of the newly transported tests fail. Merge together with the engine PR.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Testing
  • Expanded Web Platform Test coverage for additional HTML elements and display values, including flexbox and grid-related cases.
  • Added support for documents using generic monospace fonts, with a locally loaded, checksum-verified font.
  • Extended named-color normalization to cover border-image properties.
  • Updated unsupported-display testing to use a value the renderer does not support.

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 8e4ee84 and 58925ec.

📒 Files selected for processing (1)

• test/wpt/bridge.cpp

🚧 Files skipped from review as they are similar to previous changes (1)

• test/wpt/bridge.cpp

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📝 Walkthrough

Walkthrough

The WPT adapter accepts additional HTML elements and display values. Named-color normalization now covers border-image properties. Documents that request generic monospace can use a locally pinned font.

Changes

WPT adapter updates

Layer / File(s)	Summary
Expand accepted WPT input and CSS handling test/wpt/adapter.mjs, test/wpt/bridge.cpp, test/wpt/named-colors.mjs, test/wpt/adapter.test.mjs, test/wpt/README.md	The adapter accepts additional elements and display values. The bridge adds default styles for strong, aside, article, and the listed unknown elements. Named-color normalization covers border-image and border-image-source. The test and README reflect the updated scope.
Load the pinned monospace font test/wpt/fonts.mjs, test/wpt/fonts/LICENSE-DejaVu.txt, test/wpt/adapter.mjs, test/wpt/run.mjs, test/wpt/README.md	When a document requests generic monospace, the adapter adds the local font if one is not already present. The runner reads rig-owned font data and checks its SHA-256. The README records the font details and license.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~12 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant Adapter as adapter.mjs
  participant Runner as run.mjs
  participant Fonts as local fonts directory
  participant SFNT as sfntFont
  Adapter->>Runner: parsed document with monospaceFont
  Runner->>Fonts: read rig-owned font bytes
  Fonts-->>Runner: font bytes
  Runner->>Runner: verify SHA-256
  Runner->>SFNT: wrap selected bytes

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Merge Risk: ⚪ Minimal · up to 58925

No actionable merge-blocking issue was established; the change is mergeable after normal checks.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 8e4ee

The visible font-loading path uses pinned resources and integrity checks, and each normal test render runs in an isolated worker. No new exploitable path was established. Security coverage and behavior under repeated initialization remain unverified.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The established exposure is test-document processing in the WPT rig and its per-render worker; the available evidence does not establish a production or cross-service caller.

Trust Boundaries and Controls

• observed — WPT-supplied font declarations cannot set the new rig marker or digest. Non-rig paths require pinned-manifest membership and integrity validation; the rig path uses the fixed descriptor and its digest.

Resilience and Maintainability Implications

• observed — The new user-agent rules use fixed element names and register after successful viewport setup. Normal renders use fresh workers; behavior if an external caller repeatedly invokes initialization on one StyleSheet instance is unverified.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 10.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 10 functions across 6 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main changes: expanded CSS WPT coverage for fonts, named colors, display values, and elements.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Inline comments:
In `@test/wpt/adapter.mjs`:
- Line 162: Register UA default display:block rules for aside and article in
test/wpt/bridge.cpp before author styles are applied, then keep them accepted by
the tag-name check in the adapter. Ensure reftests using either element without
an explicit display style receive block layout.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 4a024835-15a4-48fd-b0f5-01812a77cb6c

📥 Commits

Reviewing files that changed from the base of the PR and between efc5e0b and 8e4ee84.

⛔ Files ignored due to path filters (1)

• test/wpt/fonts/DejaVuSansMono.ttf is excluded by !**/*.ttf

📒 Files selected for processing (8)

• test/wpt/README.md
• test/wpt/adapter.mjs
• test/wpt/adapter.test.mjs
• test/wpt/bridge.cpp
• test/wpt/fonts.mjs
• test/wpt/fonts/LICENSE-DejaVu.txt
• test/wpt/named-colors.mjs
• test/wpt/run.mjs

Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 9 remain after this review.