[Webkit-unassigned] [Bug 281863] New: "font-variant-numeric: slashed-zero" causes "font-size: 0px" to be more than zero size

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=281863

            Bug ID: 281863
           Summary: "font-variant-numeric: slashed-zero" causes
                    "font-size: 0px" to be more than zero size
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bakkot at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 473008

  --> https://bugs.webkit.org/attachment.cgi?id=473008&action=review

reproducer with embedded font

The attached file demonstrates the problem: when using a font that supports a variant slashed-zero, and you put "font-variant-numeric: slashed-zero" on an element which has "font-size: 0px", and that element contains a "0", that element takes up whitespace. It only happens for 0. Doesn't happen in Chrome or Firefox.

I've tested this with another font which has a slashed-zero variant, specifically Mozilla's Fira from https://github.com/mozilla/Fira/blob/master/woff2/FiraSans-Regular.woff2, and confirmed that it happens with that font as well, so it's not just this specific font.

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