[Webkit-unassigned] [Bug 96960] Turn on ENABLE_MATHML for Chromium

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=96960


Dave Barton <dbarton at mathscribe.com> changed:

           What    |Removed                     |Added
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                 CC|                            |ojan at chromium.org




--- Comment #13 from Dave Barton <dbarton at mathscribe.com>  2012-09-25 09:09:30 PST ---
Thanks very much for the expert information and advice.

I indeed have things building, but have been stuck on an assertion failure due to a combination of MathML, FlexBox, and SubPixel layout units. LayoutTests/mathml/presentation/roots.xhtml causes totalWeightedFlexShrink in RenderFlexibleBox::layoutFlexItems to go negative due to roundoff error, at least for chromium mac snowleopard with ENABLE(MATHML). I think the main issue is that MathML uses flexboxes but without any flex, so every child in RenderFlexibleBox::resolveFlexibleLengths becomes a violation [in a case where availableFreeSpace < 0]. Then RenderFlexibleBox::freezeViolations subtracts each preferredChildSize from totalWeightedFlexShrink [child->style()->flexShrink() is always 1], and the roundoff error brings totalWeightedFlexShrink slightly below 0.

I realize I should file a bug for this, but it'd be easier after MathML is enabled in Chrome, since I haven't been able to reproduce this without MathML yet. However, I'm thinking this summary may be enough for Tony & Ojan to say something? Thanks greatly!

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