[Webkit-unassigned] [Bug 225960] New: cave.town - partial rendering of the page for WKWebView browsers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=225960

            Bug ID: 225960
           Summary: cave.town - partial rendering of the page for
                    WKWebView browsers
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: karl+webkit at la-grange.net
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Steps to reproduce

1. With Firefox on iOS
2. Go to https://www.cave.town/products/685404-are-you-tired-of-me-yet-long-sleeve
3.  Tap any of the six button for size (S, M, L, etc.) 

Expected:
Page shows selection of the size

Actual:
black rectangles flash back and forth on the left and right halves of the screen for a few seconds.

This was reported as a webcompat bug.
https://github.com/webcompat/web-bugs/issues/72514

It reproduces on Chrome iOS and Firefox iOS
It doesn't reproduce on Safari iOS.

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