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feat: add the declaration-driven element rules and reserve their grammar - #539
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…ng, and make presence open-world
Declaration-driven, inert until a project names tags. The elements grammar is reserved at config load (string-list options gain a pattern) so a later attribute-qualified form is growth, not reinterpretation. required-element judges the composed route with an element-specific closed-world flag; presence passes in any world, absence reports only where the world is closed. The composition now carries body tag names, including app.html's <body>.
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📝 WalkthroughWalkthroughAdds configurable ChangesConfig-driven accessibility rules
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The PR adds route-level required-element checks, but current behavior can incorrectly accept routes when a required tag exists only in unused snippets or nested inert template content; the release metadata also needs the MCP version bump. Merge should wait for these bounded correctness and release-versioning fixes. Sequence Diagram(s)sequenceDiagram
participant Configuration
participant SourceCollector
participant RouteResolver
participant AccessibilityRules
Configuration->>SourceCollector: Provide validated element declarations
SourceCollector->>RouteResolver: Provide body tags and closure state
RouteResolver->>AccessibilityRules: Provide composed route accessibility data
AccessibilityRules->>AccessibilityRules: Report disallowed matches or required-element results
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In @.changeset/calm-doors-declare.md:
- Around line 2-4: Add the svelte-vitals/mcp package to the changeset with a
minor release bump, alongside the existing package entries, so the newly exposed
MCP rules are published as a minor API change.
In `@docs/src/content/docs/rules/a11y/disallowed-element.md`:
- Line 22: Update the element-name descriptions to state the complete grammar:
names must start with a letter, followed by letters, digits, or hyphens. Apply
this wording to docs/src/content/docs/rules/a11y/disallowed-element.md lines
22-22 and docs/src/content/docs/rules/a11y/required-element.md lines 23-23, and
add the equivalent Japanese wording to
docs/src/content/docs/ja/rules/a11y/required-element.md lines 23-23.
In `@docs/src/content/docs/rules/a11y/required-element.md`:
- Line 8: Qualify the introductory absence-finding statement to apply only to
closed routes, matching static mode behavior. Update the English text at
docs/src/content/docs/rules/a11y/required-element.md:8-8 and add the equivalent
closed-world qualification in Japanese at
docs/src/content/docs/ja/rules/a11y/required-element.md:8-8.
- Line 48: Update the wording at
docs/src/content/docs/rules/a11y/required-element.md:48 and
docs/src/content/docs/ja/rules/a11y/required-element.md:48 to describe presence
rather than uniqueness: use “every page contains an <h1>” in English and
equivalent presence-only Japanese wording. No rule implementation change is
needed.
In `@examples/kitchen-sink/test/e2e-suppression.test.ts`:
- Line 169: Rename the test case in the e2e-suppression suite to describe the
observable behavior it verifies, including the config-driven element rule and
directive handling for a multi-line tag, rather than the rationale about
declaration being the lever. Preserve the test implementation and assertions
unchanged.
In `@packages/cli/src/providers/source/parse.ts`:
- Around line 375-377: Update the node-walking logic around the element presence
tracking to set elementsUnknowable = true whenever a SnippetBlock is
encountered, including unused snippets, rather than treating its elementTags as
definitive. Add a regression test covering an unused snippet containing a
required element and verify the result remains open.
In `@packages/cli/src/providers/source/project.ts`:
- Around line 151-160: Replace the regex-based template removal in the markup
processing flow with nesting-aware HTML scanning or parsing so entire nested
template subtrees are excluded before tag collection. Preserve existing comment,
script, style, body-boundary, and deduplication behavior, and add a test
covering nested templates containing a required element such as nav.
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⛔ Files ignored due to path filters (1)
packages/cli/test/__snapshots__/gunshi-explain-parity.test.ts.snapis excluded by!**/*.snap
📒 Files selected for processing (36)
.changeset/calm-doors-declare.mddocs/blume.translations.jsondocs/src/content/docs/guides/(setup)/configuration.mdxdocs/src/content/docs/ja/guides/(setup)/configuration.mdxdocs/src/content/docs/ja/rules/a11y/disallowed-element.mddocs/src/content/docs/ja/rules/a11y/index.mdxdocs/src/content/docs/ja/rules/a11y/required-element.mddocs/src/content/docs/ja/rules/index.mdxdocs/src/content/docs/rules/a11y/disallowed-element.mddocs/src/content/docs/rules/a11y/index.mdxdocs/src/content/docs/rules/a11y/required-element.mddocs/src/content/docs/rules/index.mdxdocs/superpowers/specs/2026-08-19-config-driven-element-rules.mdexamples/kitchen-sink/expected-findings.jsonexamples/kitchen-sink/expected-findings.rendered.jsonexamples/kitchen-sink/svelte-vitals.config.tsexamples/kitchen-sink/test/e2e-suppression.test.tspackages/cli/src/collect-all.tspackages/cli/src/providers/source/parse.tspackages/cli/src/providers/source/project.tspackages/cli/src/providers/source/routes.tspackages/cli/test/project-facts.test.tspackages/cli/test/source-provider.test.tspackages/core/src/a11y.tspackages/core/src/rule-options.tspackages/core/src/rules/a11y/disallowed-element.tspackages/core/src/rules/a11y/element-declarations.tspackages/core/src/rules/a11y/required-element.tspackages/core/src/rules/index.tspackages/core/src/types.tspackages/core/test/a11y-config-driven-rules.test.tspackages/vite/src/providers/rendered/collect.tspackages/vite/src/providers/rendered/parse-html.tspackages/vite/test/parse-html.test.tsskills/improve-svelte/SKILL.mdskills/svelte-vitals/SKILL.md
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…he element-rule docs
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Roadmap Phase C-10 (the a11y design's "Phase 3"): the two declaration-driven element rules, and the pre-freeze decision on selector-scoped configuration.
Design:
docs/superpowers/specs/2026-08-19-config-driven-element-rules.md.The decision the roadmap flagged
Whether svelte-vitals grows a second scoping vocabulary — CSS selectors, as file-scoped markup linters use — beside the
overridesglobs it has. No. Where a declaration applies is alreadyoverrides' job for every rule, and the a11y design's other selector need (per-element overrides) is the inline directive. What a declaration names is a grammar question, and that one is settled now rather than left open: astring-listwould accept'input[type=file]'today as a tag name that matches nothing, and giving it meaning later would reinterpret an accepted value — the thing the frozen schema forbids. Soelementsis a bare tag name (^[a-z][a-z0-9-]*$, case-insensitive; custom-element names welcome), selector syntax is rejected at config load, and a later attribute-qualified form is pure growth.RuleOptionSpec'sstring-listgained a generic optionalpatternfor this.The two rules
Both inert until a project declares tags; both add across
overrides(astring-listextends, never replaces).a11y/disallowed-element— every occurrence of a declared tag in component source, anchored at the start tag so one inline directive reaches a multi-line element. A clean component passes.a11y/required-element— every route must contain the declared elements, judged on the composed route: layout chain, page, resolved components, andapp.html's<body>(static) or the prerendered<body>(build). A+page.sveltealone rarely holds the<main>, so per-file would be wrong on most SvelteKit apps. Presence is open-world safe — an unresolved component can only add elements — so a route with everything present passes in any world. Absence is a closed-world claim, made only where the route is closed for elements: every component resolved, no{@html}, no<svelte:element>. That is a new flag,elementsClosed, deliberately notfullyResolved: spreads and expression ids clear the old flag and cannot hide an element. In build mode the world is always closed; in static mode absence is reported on few routes of a real app until #533 moves, and the docs say so.The design review dropped one thing I had written: a warning when a declared tag matches nothing. That is a disallow rule doing its job as a regression guard — AGENTS.md's worked example of a legitimate empty match — not a lever that silently does nothing.
Guards
svelte-vitals.config.tsdeclares both (h1everywhere via the global layer,navon the legacy page via a route override,iframedisallowed); expected counts in both files; the e2e-suppression suite asserts the lever both ways (declarations removed → 0/0), a directive above a multi-line<iframe>, and config-load rejection ofinput[type=file]with exit 2.overridesarray now merge into the config's, since it has one.detectAppHtmlFacts' existing read.Review trail
Two design rounds (round 1 rejected the matched-nothing warning, the unreserved grammar, the closed-world PASS, reusing
fullyResolved, missing shell tags, and a strawman per-file argument — all applied) and one implementation round (APPROVE; the shell scan now tolerates an omitted</body>and skips<template>children, the finding location is qualified per mode, and the review's pin gaps are closed).Verification
pnpm build,pnpm typecheck,pnpm lint,pnpm -r test,pnpm smoke,pnpm check:publish,blume translate --checkpass. Rendered mode judges all 21 prerendered pages (20 pass, the planted<nav>miss); static mode judges the 22 element-closed routes.Summary by CodeRabbit
New Features
Bug Fixes
Documentation