[Webkit-unassigned] [Bug 266232] New: iOS 17.2 Fullscreen API - Page behind fullscreen leaks through at the top

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=266232

            Bug ID: 266232
           Summary: iOS 17.2 Fullscreen API - Page behind fullscreen leaks
                    through at the top
           Product: WebKit
           Version: Safari 17
          Hardware: iPhone / iPad
                OS: iOS 17
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: robert.bryer at bbc.co.uk

Created attachment 468977

  --> https://bugs.webkit.org/attachment.cgi?id=468977&action=review

Cookie banner leaking through the fullscreen at the top.

Some of the page behind is showing through when in fullscreen, at the top of the phone conflicting with where the iOS notch/time/battery status is. See the attached screenshot.

iPhone 13 / iOS 17.2

With the Fullscreen API feature flag turned on:
1. Visit http://cookbook.tools.bbc.co.uk/news?player=smphtml5 and play.
2. In portrait, go fullscreen.
3. See something like the cookie banner or something not fullscreen appear at the top.

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