Support MathML mphantom and TeX-like phantom, hphantom, vphantom #2143
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On the quest to tick another box in #2138
MathML
<mphantom>: MathML Core encourages the use of CSS for styling, but of course we don't have that. It's still a valid "full MathML" construct though.References:
TeX/LaTeX
\phantom,\hphantomandvphantomare no-brain implementations, with a small special extra attribute to MathML (<mphantom>only corresponds to\phantom).References:
Note: MathML has some extra considerations such as the "form" of operators in a phantom formula (e.g.
<mo form="infix">+</mo> ...- This is not addressed here, and would require a more general handling of attributes, which is another point in #2138...