Skipping commands in LaTeX document

["'Greg Shuflin' via pandoc-discuss" <pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>]

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I have a minimal test latex file `test.tex`:

\documentclass{article}

\usepackage{fontspec}

\newfontfamily\IPAFont{Doulos SIL}
\DeclareTextFontCommand{\IPA}{\IPAFont}

\begin{document}

\section{Test}
Hello \IPA{some IPA}

\end{document}

This builds fine with xelatex and produces a pdf I expect. When i try to convert this to an html document with `pandoc --pdf-engine=xelatex --verbose test.tex -o test.html`, I see the warnings:

[INFO] Could not load include file fontspec.sty at test.tex line 3 column 22
[INFO] Skipped '\newfontfamily' at test.tex line 5 column 15
[INFO] Skipped '\IPAFont{Doulos SIL}' at test.tex line 5 column 35
[INFO] Skipped '\DeclareTextFontCommand{\IPA}{\IPAFont}' at test.tex line 6 column 40
[INFO] Skipped '\IPA{some IPA}' at test.tex line 11 column 21

And the text within the custom \IPA command is skipped. How can I make pandoc not skip these?

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