[Webkit-unassigned] [Bug 107856] mathml fences often look bad
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Sat Jun 21 02:30:43 PDT 2014
https://bugs.webkit.org/show_bug.cgi?id=107856
--- Comment #6 from Frédéric Wang (:fredw) <fred.wang at free.fr> 2014-06-21 02:31:02 PST ---
(In reply to comment #5)
> I agree about <mfenced> being a bad idea.
>
> Actually, as I read the spec, the <mfenced> in this case isn't even really legal, since there's no closing fence.
I think this testcase has been generated by a previous version of MathJax which incorrectly used <mfenced> to convert thinks like
\left{ ... \right.
into
<mfenced open="{" close=""> ... </mfenced>
which per http://www.w3.org/TR/MathML3/chapter3.html#presm.mfenced is equivalent to
<mrow>
<mo>{</mo>
<mrow>
...
</mrow>
<mo></mo>
</mrow>
I'm not sure it is very good semantically to have this empty <mo> as a closing fence. That's one more good reason not to use the <mfenced> element. Fortunately, MathJax stopped using that element in the most recent versions.
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