feat(chromium): add createPagesInBackground launch option to avoid stealing focus#41282
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Andrew-Chen-Wang wants to merge 2 commits into
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feat(chromium): add createPagesInBackground launch option to avoid stealing focus#41282Andrew-Chen-Wang wants to merge 2 commits into
Andrew-Chen-Wang wants to merge 2 commits into
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Pass `background: true` to Target.createTarget for headed Chromium so that opening a new page does not activate the browser app and steal OS-level focus from the user. Playwright already emulates focus, so pages behave as foreground. The parameter is not supported by the headless shell or Android, where it is omitted. References: microsoft#4822
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@microsoft-github-policy-service agree |
…Background Replace the unconditional behavior change with a new browserType.launch() option. When enabled, headed Chromium creates pages with Target.createTarget background:true so the browser window does not activate and steal OS focus. Defaults to false.
Andrew-Chen-Wang
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Summary
browserType.launch({ createPagesInBackground: true })option (defaultfalse, no behavior change otherwise).background: truetoTarget.createTarget, sonewPage()no longer activates the browser app and steals OS focus from the user (verified on macOS).document.hasFocus()/visibilityStateare unaffected thanks to focus emulation, andpage.bringToFront()still raises the window. Skipped for headless (headless shell does not support the parameter) and Android.Why Chromium-only
-foregroundis passed (older builds did), and WebKit never steals.-foregroundCLI arg — a different mechanism than Chromium's per-newPage()foreground target creation, and there is no juggler equivalent ofbackground: true. Affected Firefox users can already opt out viaignoreDefaultArgs: ['-foreground'].-foregroundindefaultArgs()when the option is set; left out for now since it is untestable against current builds and changes launch activation rather than page creation. Happy to generalize if preferred.fixes #4822