NEW219399
[Media] Play promise rejection in HTMLMediaElement 
https://bugs.webkit.org/show_bug.cgi?id=219399
Summary [Media] Play promise rejection in HTMLMediaElement
ArekW
Reported 2020-12-01 08:23:04 PST
The HTMLMediaElement rejects play promise when the webpage's playback call sequence is: 1) create a video element 2) call video.play() 3) sets the src attribute That sequence in WPEWebkit is not handled correctly. Setting the src attribute results in play promise rejection. I have compared that with chromium and it handles that situation in a different way. The algorithm is described here: https://html.spec.whatwg.org/multipage/media.html#media-element-load-algorithm In the chromium the HTMLMediaElement cancels events, resolve promises that are scheduled to be resolved and rejects play promises that are scheduled to be rejected (Step 3 and 4). The rest of the play promises are not touched (unless step 6 takes place). In webkit's step 3: all events and promises are rejected. It is done by cancelPendingEventsAndCallbacks.
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Radar WebKit Bug Importer
Comment 1 2020-12-07 11:19:27 PST
<rdar://problem/72055839>
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