[Webkit-unassigned] [Bug 245848] New: Playing a mobile web video from espn.com apex domain does not work on iOS16 mobile devices when launching full screen playback.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=245848

            Bug ID: 245848
           Summary: Playing a mobile web video from espn.com apex domain
                    does not work on iOS16 mobile devices when launching
                    full screen playback.
           Product: WebKit
           Version: Safari 16
          Hardware: iPhone / iPad
                OS: iOS 16
            Status: NEW
          Severity: Critical
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: raymee.ferguson at disney.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

We’ve discovered an issue playing mobile web videos served from parent domain https://www. espn.com on an iPhone device running iOS16. Whenever we attempt to expand a playing video into full screen, the video expands for a brief moment but   immediately contracts out of full screen. 

We’ve done various validations and have ruled out our client code as well as our video provider (bright cove) client code.   Our findings have lead us to believe this defect is specific to our https://www.espn.com domain.  

To reproduce this defect:
- navigate to https://www.espn.com on an iPhone running iOS 16. 
- remain within the mobile web experience  
- find a video on the site
- initiate playback of the video
- post ad, and once the video is playing, click on the full-screen option 

You should see the video launch into full-screen mode but immediately retract in size.  Post these events the browser will become unstable and will eventually crash.  

This has been reproduced on iOS16 devices:
iPhone -13, 11 pro max, XS max
Browsers - Safari, Chrome

Below is the test we set up that leads us to reach out to Apple for help.

Below is a Brightcove test ruling out our front-end client code base.  It is a simple Html file with the Brightcove video player framed in.
https://www.espn.com/test/videos/bc.html 

To rule out Brightcove video player a similar Html file was created, but this time a YouTube video was embedded.
https://www.espn.com/test/videos/yt_video.html  

To further validate our working theory, running the same test against our QA domains works as expected.
https://www.espnqa.com/test/videos/bc.html?espn=cloud
Https://www.espnqa.com/test/videos/yt_video.html?espn=cloud

This has led us to believe that there is something specific to our apex domain and iOS16 and has resulted in this defect.

In digging through the git repo we stumbled across the following https://github.com/WebKit/WebKit/blob/249fdd9c0f8bf064190f69a2791917b762922bee/Source/WebCore/page/Quirks.cpp#L1516 it is not clear why this is needed but seems to be a likely culprit.

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