[Webkit-unassigned] [Bug 151592] Update CSS rules in mathml.css to adjust spacing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=151592

--- Comment #2 from Frédéric Wang (:fredw) <fred.wang at free.fr> ---
@Alex: I've done the proposed adjustment on your MathML branch, except that I kept "-webkit-line-box-contain: glyphs replaced;". Indeed, removing that one causes excessive ascent/descent and breaks tests. Upgrading the math test font to a version that has the USE_TYPO_METRICS flag gives a better result (see https://github.com/mrobinson/webkitgtk-test-fonts/issues/6) ; but using logical metrics still gives slightly taller ascent/descent than ink metrics [1]. So I suspect we will have to keep it for now and consider that again when the MathML layout code can really distinguish between logical/ink metrics. We will probably have to do something similar to Gecko (which does not support -webkit-line-box-contain) if we want to port the MathML code to Blink.

[1] http://www.mathml-association.org/MathMLinHTML5/S3.html#SS1.SSS1

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