[Webkit-unassigned] [Bug 238088] New: `<button>` loses background color with certain styles applied

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=238088

            Bug ID: 238088
           Summary: `<button>` loses background color with certain styles
                    applied
           Product: WebKit
           Version: Safari 15
          Hardware: Mac (Apple Silicon)
                OS: macOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jordan at cryptica.me

Created attachment 455123

  --> https://bugs.webkit.org/attachment.cgi?id=455123&action=review

An HTML file that reproduces the bug

In Safari 15.4 on macOS and iOS 15.4 and all the way up to the latest webkit build archive (from an hour-ish ago) a `<button>` element will lose it's background under the following condition:

1. It has an opacity less than 1.0
2. It has a transparent border color (or something that resolves to transparent like rgb(0 0 0 / 0).
3. It has a flex, inline-flex, grid, or inline-grid display value.
4. It has a non-zero border radius.

This does *not* happen for `<div>` elements — just `<button>` as far as I can tell.

I tested this in Safari 15.3 on macOS and the styling works as expected. I've attached an HTML file that reproduces this bug.

My guess is it's caused by a commit somewhere between the tags Safari-612.4.9.1.8 and Safari-613.1.17.1.8 (I'm going off the tags on GitHub for that one)

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