Can you also fill in the OT end milestones? (The usual ending would be
after 6 milestones, in 142, although earlier is also possible.)

On Wed, Apr 23, 2025 at 10:49 AM 'Gabriel Brito' via blink-dev <
blink-dev@chromium.org> wrote:

> Ok. I can't seem to be able to regenerate the draft... But, I have
> addressed your feedback and updated the chrome status feature page where
> necesary. Thanks for the tip about the webtests. I will try to do it soon.
> Thanks for the feedback!
>
> *TAG review request*: https://github.com/w3ctag/design-reviews/issues/1084
>
> *Goals for experimentation*:
> Gather feedback from web developers and validate that the current
> prototype implementation works as expected. We have added telemetry to
> measure how the feature is being exercised by users:
> - HTMLMediaElement's:
>   - # of pauses while hidden
>   - # of pauses because got hidden during playback
> - WebAudio AudioContext's
>   - # of interruptions while hidden
>   - # of interruptions because got hidden during playback
>
> *Experiment milestones*: M137
>
> On Tuesday, April 22, 2025 at 2:28:47 AM UTC-7 Domenic Denicola wrote:
>
> Generally looks good, but there's a few things to tidy up...
>
> On Tuesday, April 22, 2025 at 5:59:10 AM UTC+9 Chromestatus wrote:
>
> Contact emails gabrie...@microsoft.com, ste...@microsoft.com
>
> Explainer https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/main/
> IframeMediaPause/iframe_media_pausing.md
>
> Specification None
>
> Summary
>
> Adds a "media-playback-while-not-rendered" permission policy to allow
> embedder websites to pause media playback of embedded iframes which aren't
> rendered - i.e. have their "display" property set to "none". This should
> allow developers to build more user-friendly experiences and to also
> improve the performance by letting the browser handle the playback of
> content that is not visible to users.
>
>
> Blink component Blink>Media
> <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EMedia%22>
>
> TAG review None
>
>
> It might be worth filing this now to get feedback early. (Not a blocker
> for approving the I2E.)
>
>
>
>
> TAG review status Pending
>
> Origin Trial documentation link https://github.com/MicrosoftEdge/
> MSEdgeExplainers/blob/main/IframeMediaPause/iframe_media_pausing.md
>
> Risks
>
>
> Interoperability and Compatibility
>
> This feature is still being discussed with other browser vendors and the
> shape and functionality might not be final.
>
>
> *Gecko*: No signal (https://github.com/mozilla/standards-positions/issues/
> 1082)
>
> *WebKit*: No signal (https://github.com/WebKit/
> standards-positions/issues/409)
>
> *Web developers*: Positive (https://github.com/whatwg/html/issues/10208)
> The web community seems to be interested in this feature, even though we
> may need to iterate on the user-facing API.
>
> *Other signals*:
>
> Ergonomics
>
> This feature will be used with other audio rendering API's, like
> HTMLMediaElement and Web Audio. This new behavior should only take effect
> if web pages explicitly opt-in by overriding the permission policy's
> default state. Moreover, once the permission policy is used, it should help
> Chromium to be more optimized by pausing audio rendering for content that
> is not visible for the user.
>
>
> Activation
>
> Developers need to opt-in by setting "allow" property of an iframe. For
> example: <iframe src="https://foo.media.com"; 
> allow="media-playback-while-not-visible
> 'none'"></iframe>
>
>
> 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
>
>
> Goals for experimentation
>
>
>
> Due to https://github.com/GoogleChrome/chromium-dashboard/issues/4155
> (please upvote), this field gets lost when generating emails in Chrome
> Status. Could you copy it over for us?
>
>
>
> Ongoing technical constraints
>
> None
>
>
> Debuggability
>
> None
>
>
> Will this feature be supported on all six Blink platforms (Windows, Mac,
> Linux, ChromeOS, 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
>
> We have implemented Blink webtests. But they are not WPT's yet. -
> https://source.chromium.org/chromium/chromium/src/+/main:
> third_party/blink/web_tests/media/media-playback-while-
> not-visible-permission-policy-cant-play-if-hidden.html?q=
> third_party%2Fblink%2Fweb_tests%2Fmedia%2Fmedia-
> playback-while-not-visible-permission-policy-cant-play-
> if-hidden.html&ss=chromium%2Fchromium%2Fsrc -https://source.chromium.org/
> chromium/chromium/src/+/main:third_party/blink/web_tests/
> media/media-playback-while-not-visible-permission-policy-
> pause-when-hidden.html
>
>
> You can move these into web platform tests as long as you use the
> .tentative naming scheme
> <https://web-platform-tests.org/writing-tests/file-names.html>. (Not
> blocking for the I2E.)
>
>
>
> DevTrial instructions https://github.com/MicrosoftEdge/
> MSEdgeExplainers/blob/main/IframeMediaPause/iframe_media_
> pausing.md#proposed-solution-media-playback-while-not-
> visible-permission-policy
>
> Flag name on about://flags None
>
> Finch feature name 
> MediaPlaybackWhileNotVisiblePermissionPolicy,AudioContextInterruptedState
>
>
> Requires code in //chrome? False
>
> Tracking bug https://issues.chromium.org/issues/351354996
>
> Estimated milestones DevTrial on desktop 133
>
>
> This one is pretty important: can you fill in the experiment milestones?
>
>
>
>
> Link to entry on the Chrome Platform Status https://chromestatus.com/
> feature/5082950457884672?gate=5165819033288704
>
> Links to previous Intent discussions Intent to Prototype:
> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/
> PH7PR00MB1638C5FA59458CE0BBDC1FA6D5D72%40PH7PR00MB1638.
> namprd00.prod.outlook.com
>
>
> This intent message was generated by Chrome Platform Status
> <https://chromestatus.com>.
>
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