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For me, a little highlighting goes a long way. I don't like my code looking like a box of Crayola crayons. Throwing in multiple fonts doesn't sound helpful at all.

#section in italics because it contains a bug I've not yet fixed

I personally like having keywords and built-in identifiers in italic.

Replaced Shiki on a docs site, grammar pack was bigger than the rest of the JS. 2KB for color-only feels like a fair trade.

Or even setting bold would be nice.

yeah, although text-stroke and text-shadow probably work even better with fixed width code since it avoids changing line lengths.

Bizarre that a style sheet mechanism can't do do something that is it's primary function.

I’m guessing that due to the way highlights can cross element boundaries, it would be difficult to support any styles that could change the layout.

That seems like it could also mess with mouse selections if the text moved when selected. maybe even causing endless jitter.

I kinda wonder if "page scrolled 'cause X was selected" type data extraction attacks might play a slight role too. Although I suppose if you've managed to inject CSS all bets are off..