websem: close the SVG opacity rows - #119
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WalkthroughThe SVG compiler replaces visible-draw opacity checks with structural opacity-pass tracking. It admits partially opaque lines, preserves transparent selected paints as passes, prunes empty geometry, and adds four Chromium-backed fixtures with updated corpus records and contract tests. ChangesSVG opacity folding
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🔵 Low · up to The SVG opacity behavior is otherwise merge-ready, but the closure documentation is dated August 31, 2026 even though the current date is August 30, 2026; update the date or land the documentation after the stated closure date. Sequence Diagram(s)sequenceDiagram
participant SVGInput
participant SVGCompiler
participant PaintResolver
participant OpacityScope
SVGInput->>SVGCompiler: compile element opacity and geometry
SVGCompiler->>PaintResolver: resolve fill and stroke passes
PaintResolver-->>SVGCompiler: return paint and opacity-pass facts
SVGCompiler->>OpacityScope: fold one pass or create isolated scope
OpacityScope-->>SVGCompiler: return compiled frame node and span facts
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 71.43% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 2 files. (9 skipped: 8 unsupported, 1 too large.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@docs/wg/consolidation/web-checklist.md`:
- Around line 582-593: Update the close-note dates in the relevant checklist
entries to the actual closure date, avoiding the future date 2026-08-31; if
closure has not occurred, leave the notes for landing after that date.
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ℹ️ Review info
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Configuration used: Organization UI
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Run ID: 35e324cb-d531-4f00-b9d5-7604f2c73b96
⛔ Files ignored due to path filters (9)
fixtures/web-first/chromium/svg-opacity-line-layer-attr.pngis excluded by!**/*.pngfixtures/web-first/chromium/svg-opacity-line-layer-css.pngis excluded by!**/*.pngfixtures/web-first/chromium/svg-opacity-paintless-stages.pngis excluded by!**/*.pngfixtures/web-first/chromium/svg-opacity-selected-empty-paints.pngis excluded by!**/*.pngfixtures/web-first/svg-opacity-line-layer-attr.svgis excluded by!**/*.svgfixtures/web-first/svg-opacity-line-layer-css.svgis excluded by!**/*.svgfixtures/web-first/svg-opacity-paintless-stages.svgis excluded by!**/*.svgfixtures/web-first/svg-opacity-selected-empty-paints.svgis excluded by!**/*.svgfixtures/web-first/unsupported/svg-opacity-line-coverage-precision.svgis excluded by!**/*.svg
📒 Files selected for processing (12)
crates/n0_cli/README.mdcrates/websem/src/svg.rscrates/websem/src/svg_paint_server.rscrates/websem/tests/opacity_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 (1)
- crates/websem/tests/unsupported_corpus.rs
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Verdict
CLOSE both SVG element-opacity spellings: the CSS
opacityproperty andthe SVG presentation attribute. The complete previously admitted
<alpha-value>grammar and applicability now preserve Chromium's compositingroute, and the temporary line-coverage refusal graduates.
The defect was a bad fold proxy. The compiler counted visible resolved draws,
but Chromium decides from recorded paint/effect structure. That made a
partially opaque stroked
<line>fold element opacity into stroke opacity,changing anti-aliased edge pixels that Chromium composites after coverage.
What landed
prior opacity effects as separate producer facts until the fold decision.
transparent server, transparent pattern, and zero-ink dash as opacity
passes.
none, an invalid URL without fallback, and zero stroke width donot contribute a pass.
fold barrier, including opacity zero, while zero-extent, empty, hidden, and
display-pruned geometry remains inert.
<line>'s selected fill structurally even though it has no visiblefill area. Default fill plus stroke therefore uses the isolated layer;
explicit
fill="none"leaves the ordinary one-stroke fold.without making zero-extent geometry an opacity subject.
line refusal, and update every evidence-backed record and generated count.
rframepaint factor and isolated scope; no publicrframe, n0, or cascade matcher surface grows.Measured boundary
Four scratch matrices exercised 282 candidates through Chromium
149.0.7827.55 and both actual CLI admissions. Strict and best effort were
pixel-identical for every candidate. A separate 96-pair line search found 69
cases that were both Chromium-exact through n0 and still distinguished element
opacity from stroke opacity; the committed line cells use that exact class, so
no tolerance was added.
The four committed cells are independently discriminating:
svg-opacity-line-layer-attr: direct attribute, inherited container,<a>,<use>, and explicit-nonecontrol. Its stroke-opacity mutation moves 386pixels at maximum channel delta 2.
svg-opacity-line-layer-css: inline style, stylesheet percentage, cascadeprecedence, and explicit-
nonecontrol. Its mutation moves 290 pixels atmaximum delta 130.
svg-opacity-selected-empty-paints: eight selected transparent routesagainst four absent-paint routes. Erasing the selected passes moves 1,120
pixels at maximum delta 1.
svg-opacity-paintless-stages: live partial/zero paintless effects againstfour pruned controls. Erasing the five live stages moves 980 pixels at
maximum delta 1.
Fresh post-commit reproduction rendered those four committed sources through
strict and best-effort n0 and compared decoded pixels independently: every
strict/oracle, best/oracle, and strict/best pair was 0 pixels at delta 0.
Gate sensitivity
I deliberately collapsed structural passes back to the old visible-draw proxy.
just gatethen failed loudly:Restoring the separate structural fact returned the complete 1,051-cell gate
to green. Exact-byte controls remain exact.
Checklist and counts
opacity:[ ]→[x].opacity:[ ]→[x].baseline are untouched.
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 the ignoredsvg-opacity-recovery.plan.mdbrief:audited the full existing grammar/applicability evidence, all four new exact
cells, both status changes, the 1,051/197 ledgers, the graduated refusal,
strict/best invariance, the unchanged contract seam, and the no-score/FLIP
laws.
both admissions, decoded and compared them to the committed Chromium
oracles, verified source/oracle hashes and capture provenance, rebaked all
1,051 oracles, reran gate/status, and independently checked the sensitivity
failures.
The skeptical/full-suite pass caught two initial regressions before commit:
paintless geometry nodes must remain for context-paint ownership, and
zero-extent ellipse nodes must retain the established empty-frame contract.
Separating node retention from
has_geometryfixed both. The final docs auditalso corrected one stale sentence that still called 198 the current refusal
count.
Verification
cargo test -p websem -p rframe -p n0 -p n0_clicargo fmt --allandcargo fmt --all -- --checkcargo clippy --no-depscargo clippy --no-deps --workspace --exclude grida-canvas-wasm -- -D warningsjust bake(Chromium 149.0.7827.55; 1,051 oracles)just gatejust statuspnpm fmt:checkpnpm exec oxlint --deny-warningspnpm --filter www types:checkpnpm --filter www buildpnpm --filter @grida/reftest typecheckpnpm --filter @grida/reftest buildpnpm --filter @grida/reftest test(51 passed, 1 skipped)git diff --check