Incompatibilities between `enumitem` package and tagging mechanisms

[gengyunmaster]

The vanilla enumerate environment is compatible with tagging mechanisms, which means that if we add

%!texprogram=lualatex
\DocumentMetadata{
	lang=en,
	pdfstandard=ua-2,
	pdfstandard=a-4f,
	tagging=on,
	tagging-setup={math/setup=mathml-SE}
}

at the very beginning of the .tex source file, the compilation process passes successfully and the output .pdf file is well-tagged.

However, if we import packages like enumitem to customize layout of enumerate environment, we will not be able to compile the code. For example,

\begin{enumerate}[label=\arabic*.,ref=\arabic*,align=left,leftmargin=\labelwidth,rightmargin=0pt,labelindent=0pt,listparindent=0pt,itemindent=0pt]
	...
\end{enumerate}

causes

Package block Error: Some keys specified on the enumerate environment are(block) unknown.

What's more, \usepackage[inline]{enumitem} results in similar problems with enumerate* environment and even possibly freeze the compilation process.

In addition, while other packages, such as tasks, changing typesetting style of lists work fine during compiling, they break tags in produced .pdf files.

It is worth investigating the reason why layout modifications are not compatible with tagging mechanisms.

[davidcarlisle]

Please see

https://latex3.github.io/tagging-project/tagging-status/#enumitem

enumitem is supressed by the tagging code, much of the functionality is implemented natively with similar keys although we are aware there are still some gaps in compatibility.

[gengyunmaster]

Thank you very much!