URL: https://blog.glyphdrawing.club/font-with-built-in-syntax-highlighting/
This is super cool...a font with built in syntax highlighting using OpenType features.
This lead me to think: could it be possible to build syntax highlighting directly into a font, skipping JavaScript altogether? Could I somehow leverage OpenType features, by creating colored glyphs with the COLR table, and identifying and substituting code syntax with contextual alternates?
To achieve that, I modified an open source font Monaspace Krypton to include colored versions of each character, and then used OpenType contextual alternates to essentially find & replace specific strings of text based on HTML, CSS and JS syntax. The result is a simple syntax highlighter, built-in to the font itself.