[Webkit-unassigned] [Bug 229027] New: Incorrect grid population with shadow DOM and display: contents

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Thu Aug 12 00:54:30 PDT 2021


            Bug ID: 229027
           Summary: Incorrect grid population with shadow DOM and display:
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jeroen.zwartepoorte at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 435398

  --> https://bugs.webkit.org/attachment.cgi?id=435398&action=review

Layout bug in action

So I've tried (and failed) to create a reproducible example here: https://codepen.io/jpzwarte/pen/ZEKwZmv 

What happens in Safari & STP is that with the given DOM structure of:

  <div class="wrapper">

And with `my-container` having `display: grid; grid-template-rows: auto auto auto;`, Safari incorrectly puts the `<p>` on the first grid row.

It looks like a reflow fixes the issue.

The workaround here is to explicitly set `grid-row: 1` for the title and `grid-row: 3` for the button.

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