Intent to Implement and Ship: HTMLVideoElement.playsInline

[Mounir Lamouri]

Contact emails mlam...@google.com Explainer N/A Design docs/spec Specification: https://html.spec.whatwg.org/multipage/media.html#attr-video-playsinline Discussion to add it to spec: https://github.com/whatwg/html/issues/1237 TAG review N/A Summary Hint by the website for the user agent to display the video content within the element's playback area. Motivation Allow embedders to have a media experience where playing a video will automatically have it enter fullscreen. This attribute will offer an opt-out for websites. As a reference, this is what Safari on iPhone is doing. Risks

Interoperability and Compatibility Interoperability: already implemented by Safari. No signal from Mozilla. Compatibility: this is a hint for the user agent Firefox: No public signals Edge: No public signals Safari: Shipped Web developers: No signals Ergonomics N/A Activation The developers will use this as a hint for the UA and it may or may not be used. Security 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 attribute will be reflected on all platforms (like it does for Safari) but it will only use if the embedder decides to. Is this feature fully tested by web-platform-tests? Yes The reflection is tested here: https://github.com/web-platform-tests/wpt/blob/master/interfaces/html.idl#L420 The actual behaviour is left to the UA and can't really be tested at the moment. Tracking bug https://crbug.com/943877 Link to entry on the Chrome Platform Status https://www.chromestatus.com/features/5402804803862528

[PhistucK]

Curious -

Will there be an actual change in behavior in Chrome?

An actual change in the default behavior in Chrome?

An actual change in behavior if the developer sets it explicitly to false in Chrome?

☆PhistucK

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[Mounir Lamouri]

Hi Phistuck,

As mentioned, it will allow some embedders to have an auto-fullscreen video playback experience. This will be doable via a Blink runtime flag. Chrome on desktop and Android will not enable this flag. Setting this attribute to false will have no impact.

-- Mounir

[Anne van Kesteren]

On Wed, Mar 20, 2019 at 1:52 AM Mounir Lamouri <mlam...@chromium.org> wrote:
> Is this feature fully tested by web-platform-tests?
> Yes
> The reflection is tested here: https://github.com/web-platform-tests/wpt/blob/master/interfaces/html.idl#L420

How? IDL doesn't know anything about reflection at this point. (I know
the situation is different for Chromium, but none of that is
standardized or part of testing infrastructure thus far.)

[Domenic Denicola]

From: blin...@chromium.org <blin...@chromium.org> On Behalf Of Anne van Kesteren

> How? IDL doesn't know anything about reflection at this point. (I know the situation is different for Chromium, but none of that is standardized or part of testing infrastructure thus far.)

The proper place to test this would be in https://github.com/web-platform-tests/wpt/blob/master/html/dom/elements-embedded.js , which indeed appears to be missing a line for playsInline. Sorry we missed that when merging the spec PR!

Hopefully Mounir can add tests there, confirm that they fail without his change, and then update Chrome to pass them, as part of implementing the feature.

[Mounir Lamouri]

This shouldn't be a problem. Will do. 

[Chris Harrelson]

LGTM1

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[Yoav Weiss]

LGTM2

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[Ojan Vafai]

LGTM3

Yoav Weiss wrote:

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