The "test-markdown-render" command:

Render markdown in TEXT as HTML on stdout, where TEXT may be a file name or a markdown-formatted string.

Options:

--dark-pikchr

Render pikchrs in dark mode

--lint-footnotes

Print stats for footnotes-related issues

--safe

Restrict the output to use only "safe" HTML

--text

Run the output through html_to_plaintext().