If a JavaScript based solution would fit the bill googling "JavaScript syntax highlighter" turns up several options.

Den tis 13 apr. 2021 03:51Jeffrey Walton <noloader@gmail.com> skrev:
Hi Everyone,

I'm looking for a Syntax Highlighter for MW 1.35. The rub is, the
extension cannot shell out like the current Syntax Highlighter.[1] Our
wiki disables nearly all of those kinds of functions.

[1] https://www.mediawiki.org/wiki/Extension:SyntaxHighlight

Rather, the extension needs to have (or install via Composer), a
Python or PHP compatible library for its use. (Is this considered
"native" in the web world?)

Would someone recommend a Syntax Highlighter that uses PHP libraries
and does not shell out, please?

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