Intent to Ship: MediaTrackConstraintSet.displaySurface

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Elad Alon

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May 25, 2022, 8:47:50 AMMay 25
to blink-dev

Contact emails

elad...@chromium.org

Explainer

https://docs.google.com/document/d/1uI51R4YfFQtfiDTw1KfnLqzIu45OgxhYoUT7khlhmwQ/edit?usp=sharing

Specification

https://github.com/w3c/mediacapture-screen-share/pull/186/files

Summary

When getDisplayMedia() is called, the browser offers the user a choice of display surfaces - tabs, windows and monitors. Using the displaySurface constraint, the Web application may now hint to the browser if it prefers that a certain surface type be more prominently offered to the user.



Blink component

Blink

TAG review

N/A. This is just an addition of a single flag to an existing dictionary, following well-known patterns.

TAG review status

Not applicable

Risks



Interoperability and Compatibility

Gecko: Positive (https://github.com/mozilla/standards-positions/issues/642) Jan-Ivar Bruaroey from Mozilla, and Youenn Fablet from Apple, have both collaborated with us closely in shaping this PR. They have then approved merging this PR into w3c/mediacapture-screen-share. This is implicit support, so I'd consider it POSITIVE even though, as of the time of this writing, the official request for position has not yet been answered.

WebKit: Positive (https://lists.webkit.org/pipermail/webkit-dev/2022-May/032253.html) Jan-Ivar Bruaroey from Mozilla, and Youenn Fablet from Apple, have both collaborated with us closely in shaping this PR. They have then approved merging this PR into w3c/mediacapture-screen-share. This is implicit support, so I'd consider it POSITIVE even though, as of the time of this writing, the official request for position has not yet been answered.

Web developers: Positive See Appendix I of the internal design doc: https://docs.google.com/document/d/1U_aNptMZuYFuFWu7leq43V3hqOQ9zMEumG3x413q2pY/edit#heading=h.693jj8mh4gkw

Other signals:

WebView application risks

N/A



Debuggability

N/A



Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?

No

Supported on all platforms that support getDisplayMedia. Namely, all desktop platforms.



Is this feature fully tested by web-platform-tests?

No


Tracking bug

https://bugs.chromium.org/p/chromium/issues/detail?id=1224912

Estimated milestones

No milestones specified



Anticipated spec changes

Open questions about a feature may be a source of future web compat or interop issues. Please list open issues (e.g. links to known github issues in the project for the feature specification) whose resolution may introduce web compat/interop risk (e.g., changing to naming or structure of the API in a non-backward-compatible way).



Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/5186392840732672

Links to previous Intent discussions

Intent to prototype: https://groups.google.com/a/chromium.org/g/blink-dev/c/bVVEn-TOTYs

This intent message was generated by Chrome Platform Status.

Yoav Weiss

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Jun 1, 2022, 2:42:09 AMJun 1
to blink-dev, Elad Alon
On Wednesday, May 25, 2022 at 2:47:50 PM UTC+2 Elad Alon wrote:

Contact emails

elad...@chromium.org

Explainer

https://docs.google.com/document/d/1uI51R4YfFQtfiDTw1KfnLqzIu45OgxhYoUT7khlhmwQ/edit?usp=sharing

Specification

https://github.com/w3c/mediacapture-screen-share/pull/186/files

Summary

When getDisplayMedia() is called, the browser offers the user a choice of display surfaces - tabs, windows and monitors. Using the displaySurface constraint, the Web application may now hint to the browser if it prefers that a certain surface type be more prominently offered to the user.



Blink component

Blink

TAG review

N/A. This is just an addition of a single flag to an existing dictionary, following well-known patterns.

TAG review status

Not applicable

Risks



Interoperability and Compatibility

Gecko: Positive (https://github.com/mozilla/standards-positions/issues/642) Jan-Ivar Bruaroey from Mozilla, and Youenn Fablet from Apple, have both collaborated with us closely in shaping this PR. They have then approved merging this PR into w3c/mediacapture-screen-share. This is implicit support, so I'd consider it POSITIVE even though, as of the time of this writing, the official request for position has not yet been answered.

WebKit: Positive (https://lists.webkit.org/pipermail/webkit-dev/2022-May/032253.html) Jan-Ivar Bruaroey from Mozilla, and Youenn Fablet from Apple, have both collaborated with us closely in shaping this PR. They have then approved merging this PR into w3c/mediacapture-screen-share. This is implicit support, so I'd consider it POSITIVE even though, as of the time of this writing, the official request for position has not yet been answered.

Similar to other intents, this doesn't count as an official positive signal. Let's wait a few days to see if one emerges.

Elad Alon

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Jun 1, 2022, 3:37:31 AMJun 1
to Yoav Weiss, blink-dev
Thanks. I've set myself a reminder to ping this thread in one week, as suggested on the other intent thread.

Chris Harrelson

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Jun 22, 2022, 11:41:11 AMJun 22
to Elad Alon, Yoav Weiss, blink-dev
LGTM1

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Yoav Weiss

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Jun 22, 2022, 11:41:37 AMJun 22
to blink-dev, Chris Harrelson, Yoav Weiss, blink-dev, Elad Alon
LGTM2

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Daniel Bratell

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Jun 22, 2022, 12:13:30 PMJun 22
to Yoav Weiss, blink-dev, Chris Harrelson, Elad Alon

LGTM3

/Daniel

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Joe Medley

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Jun 22, 2022, 1:15:43 PMJun 22
to Daniel Bratell, Yoav Weiss, blink-dev, Chris Harrelson, Elad Alon
When do you hope to ship this?
Joe Medley | Technical Writer, Chrome DevRel | jme...@google.com | 816-678-7195
If an API's not documented it doesn't exist.


LGTM2

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Elad Alon

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Jun 22, 2022, 1:20:36 PMJun 22
to Joe Medley, Daniel Bratell, Yoav Weiss, blink-dev, Chris Harrelson
When I have an exact date, I will update ChromeStatus and ping this thread with the target. Currently, I only know that it will be before EoY, but no earlier than August.
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