The Chrome Status tool produces some confusion. *TO CLARIFY*, this email is
a request to extend the experiment, which currently lasts until m132
(inclusive), to run until m135 (inclusive).

Contact emailselada...@chromium.org, gui...@chromium.org

Explainer
https://github.com/screen-share/captured-surface-control/blob/main/README.md
(Will be moved from the Screen Capture CG's repo to a WebRTC WG's repo in
the coming days.)

Specificationhttps://screen-share.github.io/captured-surface-control
(Will be moved from the Screen Capture CG's repo to a WebRTC WG's repo in
the coming days.)

Design docs
https://docs.google.com/document/d/10UojDvTJ6ojBEOP7cgBIIaE7WZEfes_Qv1eN3A2A0nM/edit?usp=sharing

Summary

Web API that allows Web applications to: 1. Produce wheel events in a
captured tab or window. 2. Read/write the zoom level of a captured tab.

Blink componentBlink>GetDisplayMedia
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EGetDisplayMedia>

TAG reviewhttps://github.com/w3ctag/design-reviews/issues/962

TAG review statusIssues addressed

Origin Trial NameCaptured Surface Control

Chromium Trial NameCapturedSurfaceControl

Origin Trial documentation link
https://github.com/screen-share/captured-surface-control/blob/main/README.md

WebFeature UseCounter namekCapturedSurfaceControl

Risks

Interoperability and Compatibility
*Gecko*: No signal (
https://github.com/mozilla/standards-positions/issues/1061)

*WebKit*: No signal (
https://github.com/WebKit/standards-positions/issues/388)

*Web developers*: Strongly positive (
https://docs.google.com/document/d/1CyKBeo2tGsp_k2HhK6WjDM4dciWEbejUTflKrOVYFvM/edit?usp=sharing
)

Security

https://github.com/screen-share/captured-surface-control?tab=readme-ov-file#security-and-privacy-concerns

(Will be moved from the Screen Capture CG's repo to a WebRTC WG's repo in
the coming days.)

WebView application risks

N/A



Goals for experimentation
See under "Reason this experiment is being extended".

Reason this experiment is being extended

The spec, which was incubated in the Screen Capture CG, has now been
adopted as an editor's draft by the WebRTC WG. Some significant changes
have already been made, for example a change from sendWheel to
captureWheel; some more changes are under discussion. Several of these open
questions clearly benefit from Web developer feedback - whether the MVP
includes in-content zoom controls, whether forwarding scrolls from elements
other than <video> is necessary, etc. It would therefore be very helpful to
continue the trial, so that more real-world feedback would come pouring in
and allow us to make informed decisions.


Will this feature be supported on all six Blink platforms (Windows, Mac,
Linux, ChromeOS, Android, and Android WebView)?No

Supported on all desktop platforms. (Screen-sharing is not currently
supported on mobile platforms.)

Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
?No (inordinately difficult due to strict requirements of trusted events
stemming from user interaction)

Flag name on about://flagscaptured-surface-control

Finch feature nameCapturedDisplaySurface

Tracking bughttps://bugs.chromium.org/p/chromium/issues/detail?id=1466247

Launch bughttps://launch.corp.google.com/launch/4268170

Estimated milestones
Origin trial desktop first 122
Origin trial desktop last 127
Origin trial extension 1 end milestone 129
Origin trial extension 2 end milestone 132
Origin trial extension 3 end milestone 135
DevTrial on desktop 122

Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5092615678066688?gate=5175601697390592

Links to previous Intent discussionsIntent to Prototype:
https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAMO6jDPSgR3kX39drHd9t-JvTKBk%2B7Dg03O6dvowzw-LjQ__1A%40mail.gmail.com
Intent to Experiment:
https://groups.google.com/a/chromium.org/g/blink-dev/c/7MbIEBdHMck/m/UBbWTX-hAgAJ
Intent to Extend Experiment 2:
https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAM0wra9vLNpe45swTf1Bgm1ZbH%3DhBt0iAjN_FK49Y%3DznEea3vg%40mail.gmail.com

This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.

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