[Webkit-unassigned] [Bug 238329] New: [CSS Container Queries] Inconsistent query application in grid

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=238329

            Bug ID: 238329
           Summary: [CSS Container Queries] Inconsistent query application
                    in grid
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Mac (Apple Silicon)
                OS: Unspecified
            Status: NEW
          Severity: Major
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: scott at scottkellum.com

Created attachment 455646

  --> https://bugs.webkit.org/attachment.cgi?id=455646&action=review

A > 600px container query being applied to an element with the width of 302px

Queries are applied irregularly to elements on the page that are rendered with CSS Grid.

In the demo below, when one element on the grid row matches the CQ criteria, the styles apply to all elements on that grid row. This means that even though column three can be 400px, it will still be styled with the above 600px media query.

Replicated here:
Problem exists on both an Intel 12" MacBook and M1 Mac Mini.
https://cdpn.io/pen/debug/bGagRKK/abb869e42204412d0090a4267580b2ce


ALSO pages inside iframes don’t update live. A full-page refresh is required for the queries to take effect making it difficult to test in CodePen.
https://codepen.io/scottkellum/pen/bGagRKK/abb869e42204412d0090a4267580b2ce?editors=0100

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