websem: close the SVG points attribute - #116
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WalkthroughThe change aligns SVG ChangesSVG points behavior
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🔵 Low · up to The change now applies the corrected SVG points behavior consistently across rendering and geometry consumers, retaining only completed pairs for an unmatched final coordinate and clearing malformed lists. The PR is otherwise mergeable, but the future-dated consolidation entries should be corrected before merge. Sequence Diagram(s)sequenceDiagram
participant SVGInput
participant parse_points
participant SVGConsumers
participant PathConstruction
SVGInput->>parse_points: points attribute
parse_points-->>SVGConsumers: complete pairs or empty list
SVGConsumers->>PathConstruction: normalized polygon/polyline path
PathConstruction-->>SVGConsumers: path result or BadPathData
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 61.54% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 13 functions across 4 files. (7 skipped: 7 unsupported.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@docs/wg/consolidation/svg-engine-of-record.md`:
- Line 925: Update the consolidation history dates in the corrected addendum and
new rung heading to the actual measurement or writing date of August 29, 2026,
and update the matching close note in the web checklist accordingly. Preserve
the surrounding historical wording and formatting.
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Fix all unresolved CodeRabbit comments on this PR:
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ℹ️ Review info
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Configuration used: Organization UI
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Run ID: 472fb219-6031-4d33-a69d-1af23a25d32b
⛔ Files ignored due to path filters (18)
fixtures/web-first/chromium/svg-points-invalid-clears-list.pngis excluded by!**/*.pngfixtures/web-first/chromium/svg-points-odd-coordinate-clip.pngis excluded by!**/*.pngfixtures/web-first/chromium/svg-points-odd-coordinate-marker.pngis excluded by!**/*.pngfixtures/web-first/chromium/svg-points-odd-coordinate-object-box.pngis excluded by!**/*.pngfixtures/web-first/chromium/svg-points-odd-coordinate-polyline.pngis excluded by!**/*.pngfixtures/web-first/chromium/svg-points-odd-coordinate-single-point.pngis excluded by!**/*.pngfixtures/web-first/chromium/svg-points-odd-coordinate-trailing-comma.pngis excluded by!**/*.pngfixtures/web-first/chromium/svg-points-odd-coordinate-use.pngis excluded by!**/*.pngfixtures/web-first/chromium/svg-points-odd-coordinate.pngis excluded by!**/*.pngfixtures/web-first/svg-points-invalid-clears-list.svgis excluded by!**/*.svgfixtures/web-first/svg-points-odd-coordinate-clip.svgis excluded by!**/*.svgfixtures/web-first/svg-points-odd-coordinate-marker.svgis excluded by!**/*.svgfixtures/web-first/svg-points-odd-coordinate-object-box.svgis excluded by!**/*.svgfixtures/web-first/svg-points-odd-coordinate-polyline.svgis excluded by!**/*.svgfixtures/web-first/svg-points-odd-coordinate-single-point.svgis excluded by!**/*.svgfixtures/web-first/svg-points-odd-coordinate-trailing-comma.svgis excluded by!**/*.svgfixtures/web-first/svg-points-odd-coordinate-use.svgis excluded by!**/*.svgfixtures/web-first/svg-points-odd-coordinate.svgis excluded by!**/*.svg
📒 Files selected for processing (13)
crates/n0_cli/README.mdcrates/websem/src/svg.rscrates/websem/src/svg_path.rscrates/websem/tests/context_paint_contract.rscrates/websem/tests/points_contract.rscrates/websem/tests/unsupported_corpus.rsdocs/wg/consolidation/svg-engine-of-record.mddocs/wg/consolidation/web-checklist.mdfixtures/web-first/README.mdfixtures/web-first/STATUS.mdfixtures/web-first/oracle-bake.jsonfixtures/web-first/primitives.jsonfixtures/web-first/unsupported/README.md
💤 Files with no reviewable changes (2)
- fixtures/web-first/unsupported/README.md
- crates/websem/tests/unsupported_corpus.rs
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Verdict
CLOSE the SVG
pointsattribute row.The crux corrected the earlier points-rung record. Chromium does not retain a valid pair prefix after every malformed token: it retains completed pairs only for the SVG odd-coordinate exception. A final unmatched x coordinate is dropped (also with one trailing comma); any lexical or numeric parse error clears the whole list.
What landed
<use>instances.BadPointsidentity and graduatesvg-points-odd-coordinatefrom the refusal register.Measured boundary
Chromium 149.0.7827.55, current Blink
SVGPointList, SVG 2, and the upstream WPT agree on the split:Scratch probes covered exact Chromium pixel pairs and rendered every candidate through both actual n0 admissions. Depending on the route, incorrectly clearing an odd list lost 64–1,200 pixels at maximum channel deltas 218–233. Preserving malformed prefixes moved 660 pixels at maximum channel delta 238. Probe-only controls are labeled as such in the durable record.
Gate sensitivity was proved before trusting the result. I temporarily restored the stale two-sided behavior—clear odd lists, retain malformed prefixes—and
just gatefailed loudly on all nine new cells. Restoring the corrected rule returned the complete gate to green. No tolerance was added.Checklist and counts
points:[ ]→[x]; no other checklist row changes.Independent rung review
No Workflow runner is exposed in this environment, so
.agents/workflows/verify-rung.jscould not be invoked through itsscriptPath. I reproduced its two independent roles by hand from a self-contained ignored brief:The skeptical pass produced three fixes before the final PASS: remove the now-dead
BadPointsidentity, label probe-only controls explicitly, and correct the SVG2 link to the actual grammar anchor. The full suite then exposed one old context-paint test that intentionally depended on the retired refusal; its trigger now uses an existing named geometry-unit refusal while preserving the same unknown-box law.Verification
cargo testcargo clippy --no-depscargo fmt --all -- --checkcargo test -p websem --test points_contract --test unsupported_corpuscargo test -p websem --test best_effort the_full_oracle_corpus_is_admission_invariantjust bakejust gatejust statusgit diff --check