Font renders are complex beasts with unsafe code. Since hardening code is hard, browsers use font sanitisers!
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I certainly see the appeal of ChatGPT as a conversational interface for knowledge questions, but it's wrong often enough that I can't trust it.
Prompt: What does :extend do to an Emacs font face?
This is wrong (it's confused with :inherit) and it's hallucinated a version constraint.
It feels really un-Emacsy (to me at least) to have a UI with different font sizes. It's totally supported, but it seem to run against the "everything is an interchangeable buffer of text" vibe.