Intent to Implement and Ship: Display-Capture Capability Delegation
François Beaufort
Contact emails
Explainer
Specification
https://wicg.github.io/capability-delegation/spec.html#monkey-patch-to-screen-capture
https://github.com/WICG/capability-delegation/pull/32
Summary
This feature is based on the general delegation mechanism (https://chromestatus.com/feature/5708770829139968) shipped on M100.
Display-Capture Capability Delegation allows a Window to transfer the ability to call navigator.mediaDevices.getDisplayMedia() to another Window it trusts after relinquishing the transient user activation at the sender Window.
Blink component
Blink>GetDisplayMedia
TAG review
Covered by the review for the general delegation mechanism: https://github.com/w3ctag/design-reviews/issues/655
Risks
Interoperability and Compatibility risks remain unchanged from the general delegation mechanism; see: https://groups.google.com/a/chromium.org/g/blink-dev/c/PHT_2X7oRBE/m/gR9UiZxBAQAJ
External signals
Gecko: Positive (https://github.com/mozilla/standards-positions/issues/565
WebKit: No signal (https://github.com/WebKit/standards-positions/issues/137)
Web developers: Positive (https://github.com/w3c/mediacapture-screen-share/issues/258)
Debuggability
This remains unchanged from the general intent: https://groups.google.com/a/chromium.org/g/blink-dev/c/PHT_2X7oRBE/m/gR9UiZxBAQAJ
Ongoing technical constraints
None.
Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?
No - Supported on all Desktop platforms.
Is this feature fully tested by web-platform-tests?
Yes.
Flag name
--enable-blink-features=CapabilityDelegationDisplayCaptureRequest
Requires code in //chrome?
No.
Tracking bug
Estimated milestone
113
Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5147589575442432
Links to previous Intent discussions
Intent for the general delegation mechanism with Payment Request: https://groups.google.com/a/chromium.org/g/blink-dev/c/PHT_2X7oRBE/m/gR9UiZxBAQAJ
Intent for the general delegation mechanism with Fullscreen Request:
https://groups.google.com/a/chromium.org/g/blink-dev/c/7YkubntWi3Y/m/tyB2H5a0AwAJ
Yoav Weiss
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Mike Taylor
LGTM2
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Alex Russell
LGTM3
LGTM1
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