[Webkit-unassigned] [Bug 250828] New: mix-blend-mode stop working on a fixed layer if resolution is too large

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=250828

            Bug ID: 250828
           Summary: mix-blend-mode stop working on a fixed layer if
                    resolution is too large
           Product: WebKit
           Version: Safari 16
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: roland.tisserand.44 at free.fr

Created attachment 464554

  --> https://bugs.webkit.org/attachment.cgi?id=464554&action=review

video capture of the bug

Hello,
this bug happen on the last Safari (tested on ipad pro M1, macbook pro 2013 and mac mini 2018).

This codepen show the bug happening : https://codepen.io/danoszz/pen/QWLKKOe (scroll to the red and enlarge your windows more than 1800 px)

Any mix-blend-mode attached to a fixed or sticky element will stop working if the size of the window scale to much.
Generally around 1800px wide.

You need to reload the windows to get the blend working back.

If the element position is static or relative, it's ok.

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