I don't know what that stuff in the post in question is, so I just called it vertical text. Until I squinted, I thought it might have been Manchu script :D
Like others already mentioned 🧵, «Zalgo» is randomized unicode diacritics abuse. If 𐑘𐑹 client escaped 𐑞 diacritics, 𐑘𐑹 font is displaying diacritics correctly.
I have since found out this not actually vertical text but something called Zalgo text, which adds lots of diacritics above and below letters to make the end result very tall. https://en.wikipedia.org/wiki/Zalgo_text
I haven't seen actual vertical text on PieFed yet.
I'm honestly at a loss for recommendations. I tried Iceraven, and it didn't have reading or vertical text mode.
Einkbro’s orientation is jarring for LtR language mixed with verticals:
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In portrait mode, it should paragraph leftward. Ideally a 25 character wrap to indent the next line in the paragraph. I’ll try make an html+css example later.