[Webkit-unassigned] [Bug 220946] New: [css-flexbox] REGRESSION(r266695): content inside a `<button>` inside a flex container has a height of `0` without a declared `min-height`

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=220946

            Bug ID: 220946
           Summary: [css-flexbox] REGRESSION(r266695): content inside a
                    `<button>` inside a flex container has a height of `0`
                    without a declared `min-height`
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: drousso at apple.com
        Depends on: 210089

Created attachment 418333

  --> https://bugs.webkit.org/attachment.cgi?id=418333&action=review

[HTML] reduction

Inspecting the attached `reduction.html`, the Computed details sidebar panel shows a height of `0` for the child of the `<button>`.  After adding `min-height: 0;` to the parent of the `<button>` (which is the child of the `display: flex;`), however, the height then shows `50%` (`100px`) and the `background-color: red;` becomes visible.


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=210089
[Bug 210089] [css-flexbox] min-height: auto not applied to nested flexboxes.
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