feat(webkit): roll to r2363

[microsoft-playwright-automation]

Browser build: https://github.com/microsoft/playwright-browsers/commit/391436975620832e133460f1d282db61d4973704. Build has full platform coverage - check that all tests pass there.

[github-actions]

Test results for "MCP"

8564 passed, 1446 skipped

---

Merge workflow run.

[github-actions]

Test results for "tests 1"

3 failed
❌ [installation tests] › playwright-cdn.spec.ts:43 › playwright cdn failover should work (https://cdn.playwright.dev/dbazure/download/playwright) @package-installations-macos-latest
❌ [installation tests] › playwright-cdn.spec.ts:43 › playwright cdn failover should work (https://playwright.download.prss.microsoft.com/dbazure/download/playwright) @package-installations-macos-latest
❌ [firefox-library] › library/browsercontext-storage-state.spec.ts:453 › should work when service worker is intefering and the origin is not open @firefox-ubuntu-22.04-node20

5 flaky

⚠️ [chromium-library] › library/video.spec.ts:699 › screencast › should capture full viewport on hidpi `@chromium-ubuntu-22.04-arm-node20`
⚠️ [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`
⚠️ [firefox-page] › page/page-emulate-media.spec.ts:144 › should keep reduced motion and color emulation after reload `@firefox-ubuntu-22.04-node20`
⚠️ [firefox-page] › page/page-goto.spec.ts:90 › should work with Cross-Origin-Opener-Policy `@firefox-ubuntu-22.04-node20`

51720 passed, 1247 skipped

---

Merge workflow run.

[github-actions]

🔴 The CDN failover failures are about this roll; the Firefox one is broken on main

Hi, I'm the Playwright bot and I triaged the CI failures on bef5723.

playwright-cdn.spec.ts:43 fails while downloading webkit v2363 for mac-26-arm64 from the two ESRP endpoints — the revision this PR introduces. The Firefox storage-state failure is unrelated: it has failed 100% of the time on main since Sep 10.

Details

Caused by this PR

• [installation tests] › playwright-cdn.spec.ts:43 › playwright cdn failover should work (https://cdn.playwright.dev/dbazure/download/playwright) and the https://playwright.download.prss.microsoft.com/dbazure/download/playwright variant, both @package-installations-macos-latest. Chromium, headless shell, ffmpeg and firefox download fine; the run ends with

  pw:install -- from url: https://…/dbazure/download/playwright/builds/webkit/2363/webkit-mac-26-arm64.zip
  pw:install attempt #5 - ERROR: Download failure, code=1
  pw:install FAILED installation WebKit 26.6 (playwright webkit v2363) with error: Error: Download failure, code=1
  

  The third variant of the test, plain https://cdn.playwright.dev, passed — so webkit-mac-26-arm64 for r2363 is served by cdn.playwright.dev but not (yet) by the dbazure ESRP paths. That looks like publication/propagation of the new build rather than a defect in the one-line revision bump, so a re-run once the ESRP mirror has the file is the thing to try. Worth confirming that the mac-26-arm64 artifact really did publish to ESRP, since the same two tests failed the same way on the previous roll, feat(webkit): roll to r2362 #42736 (webkit v2362, also mac-26-arm64).

  Across the results DB these two tests are otherwise solid: 2 failing runs out of 635, and both are webkit roll PRs (this one and feat(webkit): roll to r2362 #42736). Nothing else in the recent window hits them.

Pre-existing

• [firefox-library] › library/browsercontext-storage-state.spec.ts:453 › should work when service worker is intefering and the origin is not open — broken on main, not a flake. It has failed every single run since 2026-09-10: 0 passes out of 31 runs on firefox-ubuntu-22.04-node20, plus firefox-macos-15-large/-xlarge, firefox-windows-latest, tracing-firefox, moz-firefox-nightly-library and bidi-chromium-library — 32 distinct SHAs across 18 PRs. Always the same assertion:

  expect(received).toEqual(expected)
  + Object { "name": "fromServiceWorker", "value": "yes" }
  

  A webkit revision bump can't reach a Firefox service-worker cookie assertion.

The 5 flaky entries in the report (video hidpi, third-party cookies, emulate-media, COOP) all passed on retry and are Chromium/Firefox-only, so they're out of scope for a webkit roll.

_{Triaged by the Playwright bot - agent run}

[github-actions]

Test results for "tests 2"

1 fatal errors, not part of any test
6 failed
❌ [firefox-library] › library/browsercontext-storage-state.spec.ts:453 › should work when service worker is intefering and the origin is not open @tracing-firefox
❌ [firefox-library] › library/browsercontext-storage-state.spec.ts:453 › should work when service worker is intefering and the origin is not open @firefox-macos-15-large
❌ [firefox-library] › library/browsercontext-storage-state.spec.ts:453 › should work when service worker is intefering and the origin is not open @firefox-windows-latest
❌ [firefox-library] › library/browsercontext-storage-state.spec.ts:453 › should work when service worker is intefering and the origin is not open @firefox-macos-15-xlarge
❌ [android-native] › android/device.spec.ts:56 › androidDevice.fill
❌ [android-native] › android/webview.spec.ts:44 › should navigate page externally

29 flaky

⚠️ [electron-api] › electron/electron-app.spec.ts:243 › should test app that opens window fast `@electron-ubuntu-latest`
⚠️ [chromium-library] › library/chromium/chromium.spec.ts:301 › should report intercepted service worker requests in HAR `@chrome-ubuntu-22.04`
⚠️ [chromium-library] › library/chromium/chromium.spec.ts:436 › should produce network events, routing, and annotations for Service Worker (advanced) `@chromium-macos-15-large`
⚠️ [chromium-library] › library/inspector/cli-codegen-2.spec.ts:105 › cli codegen › should upload a single file `@chromium-macos-15-large`
⚠️ [chromium-library] › library/chromium/chromium.spec.ts:213 › should intercept service worker requests (main and within) `@chromium-macos-15-xlarge`
⚠️ [chromium-library] › library/chromium/oopif.spec.ts:179 › should take screenshot `@chromium-macos-15-xlarge`
⚠️ [chromium-library] › library/chromium/chromium.spec.ts:213 › should intercept service worker requests (main and within) `@chrome-beta-ubuntu-22.04`
⚠️ [chromium-library] › library/chromium/chromium.spec.ts:373 › should produce network events, routing, and annotations for Service Worker `@chrome-beta-ubuntu-22.04`
⚠️ [chromium-library] › library/chromium/chromium.spec.ts:179 › serviceWorker(), and fromServiceWorker() work `@chrome-macos-latest`
⚠️ [chromium-library] › library/chromium/chromium.spec.ts:301 › should report intercepted service worker requests in HAR `@chrome-macos-latest`
⚠️ [chromium-library] › library/selector-generator.spec.ts:160 › selector generator › should try to improve text `@chrome-macos-latest`
⚠️ [chromium-library] › library/selector-generator.spec.ts:272 › selector generator › should use readable id `@chrome-macos-latest`
⚠️ [chromium-library] › library/selector-generator.spec.ts:426 › selector generator › should prioritize attributes correctly › placeholder `@chrome-macos-latest`
⚠️ [chromium-library] › library/selector-generator.spec.ts:430 › selector generator › should prioritize attributes correctly › name `@chrome-macos-latest`
⚠️ [chromium-library] › library/selector-generator.spec.ts:683 › selector generator › should generate noText: name from aria-label `@chrome-macos-latest`
⚠️ [chromium-library] › library/trace-viewer-scrub.spec.ts:82 › should stop and reset to first action `@chrome-macos-latest`
⚠️ [firefox-library] › library/browsercontext-cookies-third-party.spec.ts:257 › third party 'Partitioned;' cookies `@tracing-firefox`
⚠️ [firefox-library] › library/browsercontext-cookies-third-party.spec.ts:470 › top level 'Partitioned;' cookie and same origin iframe `@tracing-firefox`
⚠️ [firefox-page] › page/page-emulate-media.spec.ts:144 › should keep reduced motion and color emulation after reload `@tracing-firefox`
⚠️ [firefox-library] › library/browsercontext-cookies-third-party.spec.ts:257 › third party 'Partitioned;' cookies `@firefox-macos-15-large`
⚠️ [firefox-library] › library/browsercontext-cookies-third-party.spec.ts:470 › top level 'Partitioned;' cookie and same origin iframe `@firefox-macos-15-large`
⚠️ [firefox-library] › library/browsercontext-cookies-third-party.spec.ts:257 › third party 'Partitioned;' cookies `@firefox-windows-latest`
⚠️ [firefox-library] › library/browsercontext-cookies-third-party.spec.ts:470 › top level 'Partitioned;' cookie and same origin iframe `@firefox-windows-latest`
⚠️ [firefox-library] › library/browsercontext-cookies-third-party.spec.ts:257 › third party 'Partitioned;' cookies `@firefox-macos-15-xlarge`
⚠️ [firefox-library] › library/browsercontext-cookies-third-party.spec.ts:470 › top level 'Partitioned;' cookie and same origin iframe `@firefox-macos-15-xlarge`
⚠️ [firefox-library] › library/browsercontext-viewport.spec.ts:29 › should set the proper viewport size `@firefox-macos-15-xlarge`
⚠️ [firefox-library] › library/permissions.spec.ts:296 › local network request is allowed from public origin `@firefox-macos-15-xlarge`
⚠️ [webkit-library] › library/trace-viewer.spec.ts:121 › should show tracing.group in the action list with location `@webkit-macos-15-xlarge`
⚠️ [webkit-library] › library/screencast.spec.ts:57 › applies backpressure while async onFrame callback is pending `@webkit-macos-15-large`

111372 passed, 4739 skipped

---

Merge workflow run.

[github-actions]

🟢 None of the failures are caused by this roll

Hi, I'm the Playwright bot and I triaged the failing CI here.

This PR bumps WebKit to r2363 and touches nothing but browsers.json — yet zero WebKit tests failed. All 6 failures are Firefox and Android, and both stories are reproducible on SHAs that predate this branch.

Details

Pre-existing flake / infra

• [firefox-library] › library/browsercontext-storage-state.spec.ts:453 › should work when service worker is intefering and the origin is not open (@tracing-firefox, @firefox-macos-15-large, @firefox-windows-latest, @firefox-macos-15-xlarge) — not a flake, a pre-existing break. In the aggregated CI results this test has failed 46 of 46 runs across 30 distinct SHAs and 17 different PRs since 2026-09-10 — 42654, 42684, 42707, 42709, 42716, 42726, 42728, 42736 among them, plus pushes to main. Never passed once in that window. Same assertion every time (expect(received).toEqual(expected), 4 unexpected cookies received). It also fails on moz-firefox-nightly-library and bidi-chromium-library, which a WebKit binary can't reach.

• [android-native] › android/device.spec.ts:56 › androidDevice.fill and [android-native] › android/webview.spec.ts:44 › should navigate page externally — genuinely bimodal: 12 failed / 332 passed runs, spread over 11 SHAs and PRs 42101, 42441, 42523 plus main pushes, going back to 2026-08-03. Both fail with java.lang.RuntimeException: Timed out waiting for selector — the usual emulator-flake signature. The Android bots run Chromium on a device; the WebKit revision in browsers.json isn't downloaded or used there.

The 29 flaky results are likewise all Chromium/Electron/Firefox service-worker and codegen regulars, plus two WebKit ones that passed on retry.

One caveat on my own confidence: the report also lists 1 fatal error not attached to any test, which I couldn't attribute from the aggregated results. It didn't produce a test failure, so it doesn't change the verdict, but the merge workflow run has the raw log if someone wants to confirm.

_{Triaged by the Playwright bot - agent run}

[Devin Rousso (dcrousso)]

included in #42748