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\overline does not cope well with text-style limits on operators #490
I’ve been testing it with the HTML–CSS output of MathJax versions 2.2 and 2.0, using local TeX fonts, in Firefox 14.0.1 and Opera 11.61 on Linux.
This turns out to be an unusual interaction in the MathML used to handle the overline (and other similar constructs). We use
This seems to be a limitation of the MathML spec. You can't have the inner one have