[Webkit-unassigned] [Bug 174627] New: [iOS] WebKit media controls are sometimes shown after exiting full screen on vimeo.com

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=174627

            Bug ID: 174627
           Summary: [iOS] WebKit media controls are sometimes shown after
                    exiting full screen on vimeo.com
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: iOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media Elements
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: graouts at apple.com

Steps to reproduce:

1. go to https://vimeo.com/225249697
2. tap to start the video
3. enter fullscreen
4. exit fullscreen by tapping the X icon

Both the WebKit media controls and the Vimeo custom controls appear sometimes, but not always. This is due to https://bugs.webkit.org/show_bug.cgi?id=174626, where the "webkitfullscreenchange" event isn't fired when entering or exiting fullscreen, so depending on when the "play" or "pause" event fires, the ControlsVisibilitySupport object may think that the controls are still in fullscreen and not get an event that we exited fullscreen.

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