[Webkit-unassigned] [Bug 195153] New: Nested Fullscreen does not work and breaks functionality

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=195153

            Bug ID: 195153
           Summary: Nested Fullscreen does not work and breaks
                    functionality
           Product: WebKit
           Version: Safari 12
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rb at living.video
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

In Safari Browser, Nested Fullscreen does not work.
For example, make the documentElement fullscreen.
Then try to make a Video element within it fullscreen.
Not only does the video not enter fullscreen mode, but in most third-party video player APIs this will also break the application (as many rely on sizing from expected fullscreen).
Here is a reduced test case showing the problem:-
https://living.video/videonestedfullscreen.html
(p.s. works perfectly in all other modern browsers)

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