[Webkit-unassigned] [Bug 251378] New: Fullscreen page appears completely misaligned on scrolling up and down

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=251378

            Bug ID: 251378
           Summary: Fullscreen page appears completely misaligned on
                    scrolling up and down
           Product: WebKit
           Version: Safari 16
          Hardware: iPhone / iPad
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit API
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: joemerramos at google.com
                CC: ajuma at chromium.org

Created attachment 464756

  --> https://bugs.webkit.org/attachment.cgi?id=464756&action=review

Reproducing bug

When using the fullscreen API, scrolling down then scrolling up will cause the fullscreen to misalign and cause the screen to be in a broken state making it hard for users to properly use or exit fullscreen mode. 

Steps to repro:

On Safari: 
1. Navigate to https://davidwalsh.name/demo/fullscreen.php 
2. Tap on the Launch Fullscreen button
3. Tap on the > Back to: Fullscreen API button 
4. Scroll up and scroll down

Observed results:
Fullscreen page is misaligned on scrolling up and down 

Expected results:
Fullscreen page should not misalign on  scrolling up and down

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