The comparison has two points one of which says that for "Complex scripts (Devanagari, Arabic)", ghostty-web has " Proper grapheme handling". But when I tried something extremely simple at the https://ghostty-web.wasmer.app/ or https://ghostty.ondis.co/ demos (just `echo "कवि"`), it failed pretty miserably (and in different ways in the two demos). So I'm not sure what to make of it.

(Seems slightly better in the actual Ghostty app, but not in any usable way: here was my comparison last year https://shreevatsa.net/post/terminal-indic/ and Ghostty is comparable to the other terminal apps, better than some, worse than some. Anyway the fact that it works in Ghostty but not in ghostty-web casts doubt on “Ghostty's emulator is the same battle-tested code that runs the native Ghostty app”. Do you understand what is going on?)