[Webkit-unassigned] [Bug 235005] New: [css-flexbox][css-grid] Support last baseline

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=235005

            Bug ID: 235005
           Summary: [css-flexbox][css-grid] Support last baseline
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: philip at foolip.org

The `last baseline` keyword for alignment properties (align-content, align-items, and align-self) is recognized by the parser but for both flex and grid layout, there are FIXMEs for actually supporting it:
https://trac.webkit.org/browser/webkit/trunk/Source/WebCore/rendering/RenderFlexibleBox.cpp?rev=287742#L1679
https://trac.webkit.org/browser/webkit/trunk/Source/WebCore/rendering/RenderGrid.cpp?rev=287742#L1437

Support for this in other browsers can be seen here:
https://developer.mozilla.org/en-US/docs/Web/CSS/align-content#browser_compatibility
https://developer.mozilla.org/en-US/docs/Web/CSS/align-items#browser_compatibility
https://developer.mozilla.org/en-US/docs/Web/CSS/align-self#browser_compatibility

Note that the data is a bit messy and also wrong in places, which is why I started looking into support across browsers and filed this bug.

https://crbug.com/885175 is the Chromium bug for this.

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