[Webkit-unassigned] [Bug 230339] New: tab width is computed incorrectly for inline elements with font changes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=230339

            Bug ID: 230339
           Summary: tab width is computed incorrectly for inline elements
                    with font changes
           Product: WebKit
           Version: Safari 14
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jfkthame at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

The CSS spec (https://drafts.csswg.org/css-text-3/#tab-size-property) for tab-size is clear that 

> A <number> represents the measure as a multiple of the advance width of the space character (U+0020) of the nearest block container ancestor of the preserved tab,

but webkit appears to be using the advance width of the inline element's own space character, not the block container's.

See testcase at https://codepen.io/jfkthame/pen/JjJMoqN.

Firefox renders this correctly per spec.

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