Bug 243393

Summary:	track videos playing within the viewport when computing ActivityState::IsVisuallyIdle
Product:	WebKit	Reporter:	Cameron McCormack (:heycam) <heycam>
Component:	Media	Assignee:	Cameron McCormack (:heycam) <heycam>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Cameron McCormack (:heycam) 2022-07-31 21:15:56 PDT

ActivityState::IsVisuallyIdle on Cocoa platforms uses notifications from the window server to determine whether there have been no updates to the window recently.  DOM timers are throttled when the IsVisuallyIdle ActivityState bit is present.  Certain videos do not cause the window server to consider the window as being updated, and so we can end up being IsVisuallyIdle despite the window updating, and throttling timers unexpectedly.

Comment 1 Radar WebKit Bug Importer 2022-07-31 21:16:08 PDT

<rdar://problem/97890582>

Comment 2 Cameron McCormack (:heycam) 2022-07-31 21:30:31 PDT

Pull request: https://github.com/WebKit/WebKit/pull/2891

Comment 3 EWS 2022-08-02 00:59:51 PDT

Committed 253027@main (033dfee4f975): <https://commits.webkit.org/253027@main>

Reviewed commits have been landed. Closing PR #2891 and removing active labels.