[Webkit-unassigned] [Bug 230438] New: WKWebview sticky element with overflow hidden causes elements to disappear during overscroll

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=230438

            Bug ID: 230438
           Summary: WKWebview sticky element with overflow hidden causes
                    elements to disappear during overscroll
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: pklada at gmail.com

This doesn't seem to happen in mobile safari, only reproducible in a WKWebView. If I have a sticky element which is either itself set to overflow:scroll/auto or has a child with the same overflow rules, any child of those elements disappears during overscroll. They seem to disappear at the same moment that their container would otherwise have scrolled out of view (but is still visible due to being sticky). Note this doesn't happen with position: fixed elements, only position: sticky. 

Here is a video of the behavior: https://share.getcloudapp.com/jku40OLl

The markup is relatively simple. A sticky positioned element, inside a div with overflow set to "auto" and white-space to "nowrap" so that the container is forced to scroll. Note that if the content doesn't actually force a scroll the bug doesn't seem to occur. 

Thanks

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