websem: close direct nested SVG viewports - #131
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WalkthroughDirect non-root SVG elements now establish bounded viewports. The compiler resolves geometry, mappings, percentage bases, overflow clips, and effect ordering. Tests, Chromium fixtures, refusal records, and documentation cover the new behavior. ChangesNested SVG viewport support
Estimated code review effort: 5 (Critical) | ~120 minutes Merge Risk: 🟡 Moderate · up to Valid two-value SVG overflow attributes can render nested viewports with incorrect clipping. This should be corrected before merge. Sequence Diagram(s)sequenceDiagram
participant SVGSource
participant CSSCascade
participant WebSemCompiler
participant FrameClip
SVGSource->>CSSCascade: parse nested SVG overflow
CSSCascade->>WebSemCompiler: provide computed overflow and geometry
WebSemCompiler->>FrameClip: create antialiased viewport clip
WebSemCompiler->>SVGSource: emit mapped nested viewport frame
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 63.16% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 19 functions across 6 files. (11 skipped: 10 unsupported, 1 too large.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@crates/csscascade/src/dom.rs`:
- Around line 853-876: Update the overflow attribute handling around the
existing overflow_x and overflow_y parsing to parse attr.value once via
PropertyId::NonCustom(ShorthandId::Overflow.into()), then extend the expanded
declarations into block. Remove the separate longhand parse checks and add a
regression test covering overflow="visible hidden" on nested SVG, preserving the
expected computed overflow-x: auto behavior.
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📒 Files selected for processing (17)
crates/csscascade/src/cascade.rscrates/csscascade/src/dom.rscrates/csscascade/tests/svg_presentation_hints.rscrates/n0_cli/README.mdcrates/rframe/src/clip.rscrates/websem/src/svg.rscrates/websem/tests/nested_viewport_contract.rscrates/websem/tests/unsupported_corpus.rsdocs/wg/consolidation/svg-engine-of-record.mddocs/wg/consolidation/web-checklist.mddocs/wg/research/chromium/svg/coordinate-systems.mdfixtures/web-first/README.mdfixtures/web-first/STATUS.mdfixtures/web-first/html-inline-svg-nested-viewport.htmlfixtures/web-first/oracle-bake.jsonfixtures/web-first/primitives.jsonfixtures/web-first/unsupported/README.md
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Verdict
NV1 is CLOSE/SPLIT. Direct static non-root
<svg>now establishes its viewport; only the SVG<svg>element row closes. The shared geometry/overflow rows, HTML<svg>,<symbol>, root host sizing, viewport animation, and instance-sized<use>remain open.What changed
viewBoxmapping, nearest-viewport percentage bases, and overflow clipping entirely inwebsem.<use>.svg svg { overflow: hidden }UA rule and route the one- or two-valueoverflowpresentation shorthand through the one Stylo cascade.rframe::ClipPath; no SVG/DOM/viewport/backend vocabulary crosses the frame contract.<use>targeting<svg>, and nested viewport sources in pattern, mask, and marker programs.Chromium measurement
Chromium 149.0.7827.55 established the dimension/default table, transform order, child axis/diagonal bases, overflow cascade and edge mode, effect order, nesting, use-contained behavior, and standalone/inline parity before implementation.
A follow-up probe found a silent boundary:
<use width="32" height="16">targeting an<svg viewBox>uses an instance-sized viewport. Treating those dimensions as inert changes 2,880 pixels at maximum channel delta 233, so that route now refuses by stable name. Simple nested viewports in pattern/mask/marker sources measured exact, but those wider resource programs remain independently patrolled.Twenty-eight new Chromium-baked cells are exact. The primitive corpus moves 1,051 → 1,079, sampled frames remain 16, and the named refusal register moves 223 → 226.
Gate sensitivity
I temporarily replaced mapped child
viewBoxbases with the parent bases. Ten new cells failed loudly by 15–800 pixels, up to maximum channel delta 233. Restoring the implementation returned the complete gate to green.CodeRabbit then correctly found that the first implementation parsed the presentation attribute as two longhands and therefore dropped valid two-value shorthand syntax. A fresh pinned-Chromium probe confirmed
overflow="visible hidden"equals the CSS shorthand and computedauto hidden; dropping it changes 768 pixels at maximum delta 233. The fix parsesShorthandId::Overflowonce and tests both axis orders. Reverting only that call madejust gatefail the dedicated new cell by the measured 768 pixels/Δ233; restoration regated green.No tolerance was added.
Independent rung review
No Workflow runner is exposed in this environment, so I reproduced the repository verifier's TICK/LAW and REPRO roles manually. The law pass first found that the draft claimed explicit
autoand zero extents without isolated committed cells; I added both cells and a focused dimension-table contract test before landing. The final review confirms only the SVG<svg>row changes, every unsupported route declares a stable strict/best-effort boundary, the capture module is unchanged, and no score or FLIP artifact was touched.Verification
just gate;just statusn0strict and best-effort renders for every candidate, including all audit/review-added cellscargo test -p csscascade -p websem -p n0_clicargo test(full workspace, before the narrow review fix)cargo fmt --all -- --checkcargo clippy --no-deps --workspace --exclude grida-canvas-wasm -- -D warningspnpm fmt:check;pnpm exec oxlint --deny-warningspnpm --filter www types:checkpnpm --filter @grida/reftest typecheck,build, andtest(51 passed, 1 skipped)Local
pnpm --filter www buildentered Next 16.3's optimized Turbopack build and then made no progress or emitted an error on two bounded attempts (the second ran 10 minutes). The first hosted build completed successfully; all refreshed hosted checks are still required before merge.