Gentle reminder to follow up on requesting privacy/security/debuggability 
approvals in chromestatus (which is currently blocking LGTMs).

On Wednesday, January 24, 2024 at 7:23:28 AM UTC-5 Mike Taylor wrote:

> Would you mind requesting reviews for the various gates (privacy, 
> security, debuggability) for an OT/DT in your chromestatus entry?
> On 1/19/24 10:43 PM, Thomas Guilbert wrote:
>
> Contact emails 
>
> tguilb...@chromium.org
>
> Explainer 
>
> None
>
> Specification 
>
> https://fullscreen.spec.whatwg.org/#dom-document-fullscreenenabled
>
> Summary 
> There was an attempt in 2014 
> <https://groups.google.com/a/chromium.org/g/blink-dev/c/Bxe7DnDVRZ0/m/5K61HQPrNK4J>
>  
> to deprecate and remove the HTMLVideoElement-specific Prefixed Fullscreen 
> APIs. This meant removing the following APIs from HTMLVideoElement:
>
> readonly attribute boolean webkitSupportsFullscreen;
> readonly attribute boolean webkitDisplayingFullscreen;
> void webkitEnterFullscreen();
> void webkitExitFullscreen();
> // Note the different capitalization of the "S" in FullScreen.
> void webkitEnterFullScreen();
> void webkitExitFullScreen();
>
> The overall usage of these APIs is low, and has trended downwards over 
> time. Here are the latest usage numbers, as a % of total page loads: 
>
> PrefixedVideoSupportsFullscreen: 0.025%
> PrefixedVideoDisplayingFullscreen: 0.082%
> PrefixedVideoEnterFullscreen: 0.001%
> PrefixedVideoExitFullscreen: 0.010%
> PrefixedVideoEnterFullScreen: 0.001%
> PrefixedVideoExitFullScreen: 0.000%
>
>
> There has been an unfortunate uptick in the past 2 years for the two 
> following APIs, which means that it's best to remove them now, before they 
> see a wider adoption. These numbers might be going up because the prefixed 
> APIs are also present on iOS.
>
> https://chromestatus.com/metrics/feature/timeline/popularity/166
> https://chromestatus.com/metrics/feature/timeline/popularity/167
>
> There is an alternative set of APIs supported by all browsers that web 
> authors can use.
>
> The full history of the removal attempt is here: crbug.com/346236
>
>
> Goals for experimentation 
>
> The primary goal of the deprecation trial is to reduce the amount of 
> broken user-visible experiences as the prefixed fullscreen APIs are 
> removed, and to give time to web authors to transition to the modern API 
> (which has been available for 5 years).
>
>
> The un-prefixed fullscreen APIs have been available since Chrome M71.
>
> Experiment timeline 
>
> TBD, with a proposed 3 months duration
>
> Blink component 
>
> Blink>Fullscreen
> Blink>Media>Video
>
> TAG review 
>
> None
>
> TAG review status 
>
> Not applicable
>
> Risks 
> Interoperability and Compatibility 
>
> Web Compatibility:
>
> Removing non-standard APIs should overall help web compatibility, and 
> encourage web authors to use the unprefixed APIs. Some experiences might be 
> broken by this change, thus justifying this deprecation trial. The API has 
> been deprecated for a significant amount of time however, and usage has 
> gone down.
>
> This would only be an issue for websites that *only* support the prefixed 
> APIs.
>
>
> Interoperability:
>
>
> All browsers have shipped the new APIs, most of them using an unprefixed 
> version (Safari on iOS being the only remaining prefixed-only API). See 
> also 
> https://developer.mozilla.org/en-US/docs/Web/API/Element/requestFullscreen#browser_compatibility
>
>
> Gecko: 
>
>
> WebKit: 
>
> Web developers:
>
> Other signals:
>
> Activation 
>
> Impact on the Ads ecosystem:
>
> N/A
>
>
> 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?
>
> Potentially. The deprecation trial should give a heads up and appropriate 
> time for apps to switch over to the unprefixed APIs.
>
>
>
> Ongoing technical constraints 
>
> None
>
>
> Debuggability 
>
> N/A
>
> Will this feature be supported on all six Blink platforms (Windows, Mac, 
> Linux, Chrome OS, Android, and Android WebView)? 
>
> Yes - the prefixed API will be removed across all platforms.
>
> Is this feature fully tested by web-platform-tests 
> <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
> ? 
>
> Yes
>
> WPTs testing the prefixes are removed: 
> https://github.com/web-platform-tests/wpt/blob/master/fullscreen/api/historical.html
>
> WPTs testing the new API: 
> https://github.com/web-platform-tests/wpt/tree/master/fullscreen/api
>
>
> Flag name on chrome://flags 
>
> None
>
> Finch feature name 
>
> PrefixedVideoFullscreen
>
> Non-finch justification 
>
> None
>
> Requires code in //chrome? 
>
> False
>
> Launch bug 
>
> None
>
> Estimated milestones 
>
> DevTrial on desktop
>
> 123
>
> DevTrial on Android
>
> 123
>
>
> Link to entry on the Chrome Platform Status 
>
> https://chromestatus.com/feature/5259513871466496
>
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> .
>
>

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