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Description
Rules in arrays aren't shown in the mathml. I think this should be the rowlines and columnlines attributes (https://www.w3.org/TR/mathml4/#presm_mtable_attrs).
\DocumentMetadata
{
lang=en-US,
pdfversion=2.0,
pdfstandard=ua-2,
tagging=on,
}
\documentclass{article}
\usepackage{unicode-math}
\begin{document}
\[
\begin{array}{c|c}
A & B \\
\hline
C & D
\end{array}
\]
\end{document}<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<div>
<h2>\mml 1</h2>
<p>\begin {equation*}\begin {array}{c|c} A & B \\ \hline C & D \end {array}\end {equation*}</p>
<p>37EAFD4D7B61624EE77ED488030824C2</p>
<math display="block" xmlns="http://www.w3.org/1998/Math/MathML">
<mpadded lspace="+4.981pt" width="+9.963pt">
<mtable>
<mtr>
<mtd>
<mi>𝐴</mi>
</mtd>
<mtd>
<mi>𝐵</mi>
</mtd>
</mtr>
<mtr>
<mtd>
<mi>𝐶</mi>
</mtd>
<mtd>
<mi>𝐷</mi>
</mtd>
</mtr>
</mtable>
</mpadded>
</math>
</div>
</html>