Contact emails

[email protected]

Explainer

https://github.com/WICG/capability-delegation#allowing-display-capture-from-cross-origin-iframe-click

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

https://crbug.com/1412770

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

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