[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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