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Firefox: _moz-* attributes appear in the code generated by SourceElement() #328
For the record, the Bugzilla entry is:
I'm not sure it is worth trying to filter it out earlier, especially since I understand that Firefox should be removing those itself in the future. It could be done with a regular expression replacement by the
It turns out that these can be filtered without regular expressions.
Because some browsers return
This turns out to be the reason for the unexpected slowness of the MathML processing compared to SVG that Fred noted at one point.
It would be possible to clone the MathML tree into an XML document and use