[Webkit-unassigned] [Bug 240278] New: Issue with a Grid container with aspect-ratio without a fixed width

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=240278

            Bug ID: 240278
           Summary: Issue with a Grid container with aspect-ratio without
                    a fixed width
           Product: WebKit
           Version: Safari 15
          Hardware: All
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kevin at kevinpowell.co

Created attachment 459118

  --> https://bugs.webkit.org/attachment.cgi?id=459118&action=review

screenshot of the bug and examples of how it should behave

This behaviour is only in Safari 15.4. Everything works as expected in 15.3 and earlier.

A grid container with an `aspect-ratio` and a width of `auto` or a percentage will not allow its children to use the available space.
If the width is a fixed value (with `px`, `rem`, etc.) or if it is set in viewport units, it behaves as expected.

In the attached screenshot, all three should look the same. 
The element with the text has an `align-self: end` which should move it to the bottom of the parent. It does for the examples using `px` and `vw` widths, but not the one using `%`.

You can also see a live example of this here: https://cdpn.io/pen/debug/MWQyMOV

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