[How] can I escape all markup characters in CommonMark source?

My Rationale

At github.com/mysociety/alaveteli/issues/8958, I needed to post the rendered text of an .eml into a form that utilised GitHub's "GitHub-Flavoured Markdown" superset of CommonMark.

CommonMark inherently includes HTML5 LS support, but GHFM lacks <xmp> support. ^[1] The sole available equivalent is <pre>, so to have such content render, I need to run it through an HTML5 sanitiser.

This isn't much of a problem, except that it also supports CommonMark. No quivalent exists for CM. Consequently, I am forced run it through an LLM for the subsequent CommonMark sanitisation step.

Nobody should ever require sanitisation by LLM...

Conducted Research

At stackoverflow.com/revisions/48151864/2, I see that a way to achieve this for HTML would be to utilise an InterNet browser as a parser. No equivalent exists for CommonMark. ^[2]

Consequently, does a library provide this in its stead, or must I literally hardcode every escape sequence, the next time I want to accomplish this?

The Placement Of The Question

Although the tag may state that software recommendations are, wholesale, off-topic, posts/288333/history#1 explains otherwise I am inclined to consider its sensible nuances to be authoritative.

Regardless, if code is able to achieve this, I shall consider that to be an answer; a pre-packaged “tool” (so-to-speak) isn't required (nor, per se, desired). However, a GUI is preferrable over a script, because its user experience is inherently so far improved.

If, regardless, undesirable here, please move to Power Users. ^[3]

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1. stackoverflow.com/revisions/11249786/2 ↩︎

2. stackoverflow.com/revisions/79805092/1 ↩︎

3. meta.codidact.com/posts/279821/history#1 ↩︎