[Webkit-unassigned] [Bug 131839] New: Some math fonts have excessive ascent/descent

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Thu Apr 17 22:00:30 PDT 2014


https://bugs.webkit.org/show_bug.cgi?id=131839

           Summary: Some math fonts have excessive ascent/descent
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
               URL: http://www.maths-informatique-jeux.com/ulule/mathml_to
                    rture_test/ascent-descent.html
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: fred.wang at free.fr
            Blocks: 130322


This is blocking the support for OpenType MATH fonts (bug 130322).

The bug happens to me on Linux, although it does not show up in the MathML code of bug 130322. I'm wondering if the -webkit-display-inline-flex rule in the UA mathml.css stylesheet prevents the bug. However, Gurpreet said it happens on Windows (see attachment 229117).

Gecko has a similar issue (https://bugzilla.mozilla.org/show_bug.cgi?id=947650) and the suggestion was to "prefer OS/2 sTypo* metrics to hhea ascent/descent if USE_TYPO_METRICS flag is set, and for OpenType Math fonts".

It's not clear to me if that's a browser bug (USE_TYPO_METRICS is ignored) or a font bug (hhea ascent/descent should match the typo metrics). See https://bugzilla.mozilla.org/show_bug.cgi?id=947650#c2

Could someone try

http://www.maths-informatique-jeux.com/ulule/mathml_torture_test/ascent-descent.html

on Mac?

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