Contact emailselada...@chromium.org

Explainer
https://docs.google.com/document/d/1M63lyDHV-v6LPFzHjfsjBDMfyn075pySa3xfIRSB9zU/edit?usp=sharing

Specificationhttps://github.com/w3c/mediacapture-screen-share/pull/216/files

Summary

Hint allowing Web applications to instruct the browser whether, upon
calling getDisplayMedia(), the current tab should be excluded from the list
of tabs offered to the user.


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

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

TAG review statusNot applicable

Risks


Interoperability and Compatibility

*Gecko*: Positive (https://github.com/mozilla/standards-positions/issues/639)
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/032249.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 Interest expressed by Google Meet.

Security

The current tab is the surface most under an attacker’s control. Nudging
the user away from this risky surface is a good thing. Of course, malicious
applications can avoid using this new control, or use it to retain the old
behavior (current tab still offered). This is not a problem - it simply
means that this new surface offers no degradation in security, although not
a security feature in its own right.


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
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
?No

Estimated milestones

No milestones specified


Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5118675366445056

Links to previous Intent discussionsIntent to prototype:
https://groups.google.com/a/chromium.org/g/blink-dev/c/COid122-_AE

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

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