I looked into it a little more: xparse: The xparse package isn't on the list of LaTeX packages supported by Mathjax, and the actual command we need from it, \DeclareDocumentCommand, isn't in the list

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I always do this: I'm reading your response more carefully now and I think it is exactly what I need. Thanks.

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That worked perfectly! Thank you very much!

#Equations #mathjax

We will define the \oiiint code. So just use that for now and we can handle the specific code behind the scenes.

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Thanks for your instructions! VIncent

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Also note that \displaystye should not be used here, find details on when to use that code here (section "when editing math pages") https://chem.libretexts.org/Courses/Remixer_University/LibreTexts_Co

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