If a reprex is desired: 

Contents of test.txt: 

# test

\begin{align*}
f(x) &= x \\
&= 2
\end{align*}


Call to pandoc: pandoc test.txt --mathml -f commonmark_x -t html5

yields:

<h1 id="test">test</h1>
<p>\begin{align*} f(x) &amp;= x \ &amp;= 2 \end{align*}</p>

Instead of the correct MathML that is rendered with -f markdown: 

<h1 id="test">test</h1>
<p><math display="block" 
xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mtable><mtr><mtd 
columnalign="right"><mi>f</mi><mrow><mo stretchy="true" 
form="prefix">(</mo><mi>x</mi><mo stretchy="true" 
form="postfix">)</mo></mrow></mtd><mtd 
columnalign="left"><mo>=</mo><mi>x</mi></mtd></mtr><mtr><mtd 
columnalign="right"></mtd><mtd 
columnalign="left"><mo>=</mo><mn>2</mn></mtd></mtr></mtable><annotation 
encoding="application/x-tex">\begin{align*}
f(x) &amp;= x \\
&amp;= 2
\end{align*}</annotation></semantics></math></p>
On Sunday, March 6, 2022 at 3:53:24 PM UTC-8 Connor Patrick Jackson wrote:

> I am attempting to use an align environment in a markdown file being 
> compiled to both HTML and LaTeX. Doing so works fine with the markdown 
> reader, but not with the commonmark_x reader, for either MathML or 
> MathJax (the commonmark_x reader just passes it through as unaltered 
> text). I *thought* that I had previously been able to use the commonmark_x 
> reader to handle align environments for equation aligning, but I could be 
> misremembering. 
>
> Could someone confirm for me whether this is a feature that should be 
> working, but isn't (in which case I'll go file a bug report), or if this is 
> yet to be implemented in the commonmark_x reader? If the latter, is this 
> an extension that is yet to be implemented (latex_macros?), or just a 
> feature that needs to be ported over?
>
> Thanks! 
>
> Connor
>

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