As originally discussed atgithub-linguist/linguist/issues/7637, when a CommonMark<pre><code> (~~~) with a syntax highlight declaration (~~~RegEx) is utilised inside a Markdown footnote, itsfont-size reduces, and the syntax highlight designation is not applied, such that it reproducesissues/1851:

Reproductive Markup

[^1][^1]:~~~MA    "(?:(?:headers)|(?:cookies))"\s*:\s*(?:\{[^{}]*\}|\[[^\[\]]*\]|"[^"]*"|[^,}\]]*)(?:,)?\s*    ~~~

Comparison Of Correct And Incorrect Presentation

~~~RegEx	~~~txt