[Webkit-unassigned] [Bug 243393] New: track videos playing within the viewport when computing ActivityState::IsVisuallyIdle

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=243393

            Bug ID: 243393
           Summary: track videos playing within the viewport when
                    computing ActivityState::IsVisuallyIdle
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: heycam at apple.com
                CC: webkit-bug-importer at group.apple.com

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.

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