[microsoft-playwright-automation]

WebKit's PublicKeyCredential fallback is a plain object, so constructor-based WebAuthn feature checks reject it. Use a named class that throws on construction in both WebKit backends, preserving native constructors and the existing async static methods.

Extend CA-029 to check the interface shape before and after virtual credentials are installed.

Fixes #43711

_{Prepared by the triage workflow.}

[github-actions]

Test results for "MCP"

5194 passed, 616 skipped

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Merge workflow run.

[github-actions]

Test results for "tests 1"

1 failed
❌ [chromium-library] › library/video.spec.ts:762 › screencast › VI-030 should work with video+trace @chromium-playwright-x64-ubuntu24-64-core-node22

23596 passed, 707 skipped

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Merge workflow run.

[github-actions]

🟡 One iOS failure remains uncertain

Hi, I'm the Playwright bot. I checked the CI failures against the PR diff and refreshed test history.

Details

The only failure in the latest merged report is a confirmed Chromium flake. The separate iOS WebView checks have 16 failures: 15 also failed before this PR, and one lacks independent history. None has a demonstrated link to this PR.

The diff changes only WebKit's PublicKeyCredential fallback and its capability test. That test, CA-029, passed on Chromium, Firefox, and desktop WebKit.

Uncertain

• [webkit-webview-page] › page/elementhandle-scroll-into-view.spec.ts:88 › EH-124 should scroll nested display:contents into view — timed out after 30 seconds on both attempts. The PR does not change scrolling or this test, so a connection looks unlikely. However, the refreshed database contains this exact test/project only on this PR. A run of this test on iOS at the PR's base, bda54b052be6, is needed to establish whether it already fails there.

Pre-existing flake / infra

• [chromium-library] › library/video.spec.ts:762 › screencast › VI-030 should work with video+trace — all four attempts failed because the trace contained no screencast-frame, causing frame.file to throw. The same test on the same Ubuntu bot produced the identical error and then passed on retry in #43774's run, before this PR. Across 271 earlier unrelated run attempts on that bot, 23 ended in failure and 118 passed after an earlier failure. This PR does not change Chromium, video recording, or tracing.

• 15 iOS WebView failures are pre-existing, not necessarily intermittent. Each exact test/project also failed with the same assertion or timeout in #43363's October 28 run, before this PR. All entries below are [webkit-webview-page] under page/:

File	Test IDs	Matching earlier failure
locator-any-frame.spec.ts	LO-028, LO-048, LO-049, LO-050	Two frames instead of three
locator-is-visible.spec.ts	LO-121	List-box option reported hidden
page-add-init-script-callback.spec.ts	IS-021	Three callbacks instead of two
page-click.spec.ts	CL-076	Removed iframe still retained
page-drag.spec.ts	DD-028	Drop effect none instead of move
page-filechooser.spec.ts	FC-027	Timed out waiting for the file chooser
page-focus.spec.ts	FO-012	Focus assertion returned false
page-goto.spec.ts	NA-003	File-URL navigation timed out
page-mouse.spec.ts	MO-012	Mouse movement deltas were zero
page-navigation.spec.ts	NA-070	Frame load interrupted
page-screenshot.spec.ts	SS-095	page.setViewportSize: Method not implemented
page-set-input-files.spec.ts	IF-003	Folder upload timed out

_{Triaged by the Playwright bot - agent run}