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$\DeclareMathOperator{\homop}{Hom} \newcommand{\Hom}[2]{\homop\left(#1,\,#2\right)} \newcommand{\lt}{<} \newcommand{\gt}{>} \newcommand{\amp}{&} \definecolor{fillinmathshade}{gray}{0.9} \newcommand{\fillinmath}[1]{\mathchoice{\colorbox{fillinmathshade}{$\displaystyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\textstyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\scriptstyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\scriptscriptstyle\phantom{\,#1\,}$}}} $

Section 29.4 Copying Mathematics

A reader can copy a piece of mathematics out of the HTML version and into another document. Right-click (or control-click) on any mathematics to bring up MathJax’s contextual menu. Under “Show Math As” you can choose “MathML Code”, which is suitable for a word processor, or “Original Form”, which is the underlying LaTeX source. The “Copy to Clipboard” submenu offers the same two choices as a direct copy. To place mathematics into a leading commercial word-processor, copy the MathML and then use its “Paste Special” command, pasting as “Unformatted Text”. To reuse the mathematics in LaTeX source instead, copy the original form—bearing in mind that it may contain the document’s custom LaTeX macros (defined in <docinfo>), which are only meaningful alongside their definitions.

As with permalinks, this is worth making known to your readers, perhaps in a preface.

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