feat: add WebView accessibility lab

[thymikee]

Summary

Add a react-native-webview accessibility lab to Agent Device Tester with a deterministic semantic fixture and exploratory targets for Callstack, Vercel, Hacker News, Reddit, W3C Forms, and Wikipedia.

Teach iOS interactive snapshot presentation to recognize typed and legacy WebView roots and safely project WebKit's direct Other -> StaticText wrapper pairs as text or headings. Preserve genuine Other landmarks when XCTest does not expose stronger semantics, keep raw snapshots unchanged, and document scoped WebKit subtrees as an XCTest limitation.

Before / after accessibility snapshots

These focused excerpts omit refs and geometry. The first replays the WebKit tree shape captured during iOS testing through main and this PR.

WebKit wrapper pattern

Before (main)	After (this PR)
[application] "Example" [webview] "Example page" [other] "Example page" [other] "Welcome" [other] "Introduction" [link] "Read more"	[application] "Example" [webview] "Example page" [heading] "Welcome" [text] "Introduction" [link] "Read more"

The document-title wrapper is removed, while the heading, paragraph, and link remain in their semantic order.

Tester app fixture

The deterministic react-native-webview fixture reproduced the community report on iOS:

Before (main)	After (this PR)
[other] "WebView semantic fixture" [other] "Ordinary paragraph text should not be categorized as other." [other] "Account form"	[heading] "WebView semantic fixture" [text] "Ordinary paragraph text should not be categorized as other." [heading] "Account form"

The conversion is scoped to direct Other -> StaticText pairs below a WebView. Adversarial fixtures confirm that structural landmarks such as [other] "main", same-label nested action wrappers, and equivalent pairs outside a WebView stay unchanged.

Validation

• pnpm format:check
• pnpm typecheck
• pnpm lint
• Focused Vitest suite: 60 tests passed
• pnpm build:xcuitest
• pnpm check:fallow --base origin/main
• Full unit suite: 4,375 tests passed; one host-load slow gate passed in isolation
• Provider integration contention cases passed in isolation
• Live iOS verification on the fixture, Callstack, Vercel, Hacker News, Reddit, W3C Forms, and Wikipedia
• Live Android verification of the deterministic fixture through the Android helper backend
• Adversarial reviews completed, including claude -p

[github-actions]

Size Report

Metric	Base	Current	Diff
JS raw	1.83 MB	1.82 MB	-2.9 kB
JS gzip	583.8 kB	582.8 kB	-1.1 kB
npm tarball	698.0 kB	697.0 kB	-1.0 kB
npm unpacked	2.45 MB	2.44 MB	-2.8 kB

Startup median (7 runs, lower is better):

Scenario	Base	Current	Diff
CLI --version	27.3 ms	27.8 ms	+0.6 ms
CLI --help	57.3 ms	57.7 ms	+0.4 ms

Top changed chunks:

Chunk	Raw diff	Gzip diff
dist/src/runtime.js	-1.1 kB	-450 B
dist/src/session.js	-1.3 kB	-449 B
dist/src/internal/daemon.js	+1.3 kB	+397 B
dist/src/selector-runtime.js	-464 B	-120 B
dist/src/cli-help.js	-316 B	-116 B

[thymikee]

Reviewed exact head f3ac9ef. P2: web.ts classifies any WebView-descended Other with a same-label direct StaticText as text, without proving it is a leaf WebKit wrapper. A legitimate labelled landmark/container such as Other "News" containing StaticText "News" plus a Link also matches; the presenter rewrites the container to text and duplicate suppression removes the actual text child. That contradicts the stated guarantee to retain genuine Other landmarks and can turn a large container into the apparent text target. Restrict the projection to a proven wrapper shape (for example, exclude nodes with semantic sibling/descendant content) and add this direct-child adversarial fixture. The current test covers only a nested same-label StaticText under a Button and misses this case. Current checks are green except one Smoke Tests job still in progress.

[thymikee]

Addressed in 4c65a10. WebKit text/heading projection now requires a proven leaf wrapper shape: the Other must have exactly one direct same-label StaticText child, and that text node must itself be a leaf. Any additional or nested content keeps the container as Other. Added the adversarial Other "News" -> StaticText "News" + Link "Read more" fixture; focused presentation tests pass (33/33). The affected run’s unrelated host-load timeout files also pass in isolation (63/63).

[thymikee]

Reviewed exact head 4c65a10. The prior WebView container false-positive is fixed: text/heading projection now requires an exact leaf wrapper with one direct same-label StaticText child and no descendants. The added regression covers the previously missing Other "News" → StaticText "News" + Link "Read more" shape and confirms the landmark remains Other with its semantic child preserved. All current checks are green. No further findings.

[github-actions]

PR Preview Action v1.8.1
Preview removed because the pull request was closed.
2026-07-25 09:40 UTC