fix(webkit): hit target check inside nested shadow roots

[Pavel Feldman (pavelfeldman)]

Summary

• WebKit's elementsFromPoint() on a nested shadow root puts the outermost host first when the target is an <input>. Extend the existing workaround to skip the host of any enclosing shadow root, not just the current one.

Fixes #43118

[github-actions]

Hi, I'm the Playwright bot and I took a first look at the CI failures here.

🟢 Both failures are pre-existing flakes — this PR is clear

The two red tests are test-runner timing failures with independent failures on unrelated PRs. This PR only changes hit-target handling in the injected script and adds coverage for nested shadow roots, so neither failure exercises the changed path.

Details

Pre-existing flake / infra

• [playwright-test] › playwright.trace.spec.ts:436 › should retain traces for interrupted tests (@windows-latest-node22) — the interrupted count was 0 instead of 1. The same test failed on the same Windows bot on docs-only PR docs(coverage): anonymous scripts have an empty url #43060, and its earlier failures include unrelated main and PR runs documented on feat(browserContext): support maximized viewport #42286. This PR does not touch tracing or test interruption.

• [playwright-test] › reporter.spec.ts:251 › created › should not have internal error when steps are finished after timeout (@windows-latest-node22) — the test itself timed out. The exact created variant also failed on docs-only PR docs: fix deprecated Playwright API usage in running-code.md #39403 and unrelated PR chore: swallow TargetClosedErrors in beforeunload dialog.dismiss() #39788. This PR does not touch the reporter or timeout handling.

The seven flaky entries in the report passed on retry and do not change the verdict.

_{Triaged by the Playwright bot - agent run}

[github-actions]

Test results for "tests 1"

8 flaky

⚠️ [chromium-library] › library/chromium/chromium.spec.ts:301 › should report intercepted service worker requests in HAR `@chromium-ubuntu-22.04-arm-node20`
⚠️ [chromium-library] › library/video.spec.ts:725 › screencast › should capture full viewport on hidpi `@chromium-ubuntu-22.04-arm-node20`
⚠️ [chromium-library] › library/video.spec.ts:762 › screencast › should work with video+trace `@realtime-time-library-chromium-linux`
⚠️ [chromium-library] › library/video.spec.ts:762 › screencast › should work with video+trace `@chromium-ubuntu-22.04-node24`
⚠️ [chromium-library] › library/beforeunload.spec.ts:130 › should support dismissing the dialog multiple times `@chromium-ubuntu-22.04-node22`
⚠️ [chromium-library] › library/video.spec.ts:113 › screencast › should capture static page `@chromium-ubuntu-22.04-node22`
⚠️ [firefox-library] › library/browsercontext-cookies-third-party.spec.ts:257 › third party 'Partitioned;' cookies `@firefox-ubuntu-22.04-node20`
⚠️ [firefox-library] › library/browsercontext-cookies-third-party.spec.ts:470 › top level 'Partitioned;' cookie and same origin iframe `@firefox-ubuntu-22.04-node20`

46659 passed, 1180 skipped

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