[Webkit-unassigned] [Bug 266231] New: iOS 17.2 Fullscreen API - White bars left and right when fullscreen

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=266231

            Bug ID: 266231
           Summary: iOS 17.2 Fullscreen API - White bars left and right
                    when fullscreen
           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 468976

  --> https://bugs.webkit.org/attachment.cgi?id=468976&action=review

White bars in landscape fullscreen

White bars in the background of fullscreen appear to the left and right when in landscape. I think it is taking this background colour from the page, when I would expect this colour to be black from the user agent stylesheet default:

*|*:not(:root):fullscreen::backdrop {
  background:black;
}
https://fullscreen.spec.whatwg.org/#user-agent-level-style-sheet-defaults

iPhone 13 / iOS 17.2

With the Fullscreen API feature flag turned on:
1. Visit http://cookbook.tools.bbc.co.uk/news?player=toucan
2. Play the video.
3. Go fullscreen and turn it landscape.

Screenshot attached.

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