Contact emailsdalecur...@chromium.org

ExplainerNone

Specification
https://html.spec.whatwg.org/multipage/media.html#loading-the-media-resource

Design docs
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/source#media

Summary

Adds support for CSS media queries to <source> elements used with <video>
elements. Allowing developers to use media query syntax to tell the browser
which source should be preferred for a given environment.


Blink componentBlink>Media>Video
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EMedia%3EVideo>

TAG reviewNone

TAG review statusNot applicable

Risks


Interoperability and Compatibility

Chromium used to support this feature, but it was deprecated and removed in
https://bugs.chromium.org/p/chromium/issues/detail?id=338197 -- foolip@ now
believes this removal was incorrect.


*Gecko*: Shipped/Shipping (
https://bugzilla.mozilla.org/show_bug.cgi?id=1836128)

*WebKit*: Shipped/Shipping (
https://github.com/whatwg/html/issues/6363#issuecomment-1556228111)

*Web developers*: Positive (12 stars on the issue. Developers are
passionate enough to implement the feature themselves in Firefox)

*Other signals*:

WebView application risks

Does this intent deprecate or change behavior of existing APIs, such that
it has potentially high risk for Android WebView-based applications?

None


Debuggability

None


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

Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
?Yes

https://wpt.fyi/results/html/semantics/embedded-content/media-elements/loading-the-media-resource/resource-selection-source-media-env-change.html?label=master&label=experimental&aligned


Flag name on chrome://flagsNone

Finch feature nameVideoSourceMediaQuerySupport

Requires code in //chrome?False

Tracking bughttps://bugs.chromium.org/p/chromium/issues/detail?id=1450316

Estimated milestones
Shipping on desktop 120
Shipping on Android 120
Shipping on WebView 120

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).
None

Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5144127067127808

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

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