[Webkit-unassigned] [Bug 171914] New: Add heuristic to avoid flattening "fullscreen" iframes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=171914

            Bug ID: 171914
           Summary: Add heuristic to avoid flattening "fullscreen" iframes
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Frames
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fred.wang at free.fr
            Blocks: 149264

Some authors implement fullscreen popups as out-of-flow iframes with size set to full viewport (using vw/vh units). We should not flatten such iframes or they could become larger than the viewport. Simon suggested to add it under a preference option (disabled by default for now).


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=149264
[Bug 149264] IFrame scrolling=yes is ignored in iOS Safari
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