[alpb]

I'm having trouble understanding what this does. Apparently there's a popover when you select the text you typed. I had to go to https://github.com/ekmartin/unicode-style to figure this out.

[floatrock]

It's a kinda ascii-art thing that 𝔩𝔢𝔱𝔰 𝔶𝔬𝔲 𝔞𝔫𝔰𝔴𝔢𝔯 𝔥𝔫 𝔠𝔬𝔪𝔪𝔢𝔫𝔱𝔰 𝔞𝔩𝔩 𝔣𝔞𝔫𝔠𝔶 𝔩𝔦𝔨𝔢 𝔱𝔥𝔦𝔰. 𝕆𝕣 𝕝𝕚𝕜𝕖 𝕥𝕙𝕚𝕤 𝕚𝕗 𝕪𝕠𝕦 𝕨𝕒𝕟𝕥 𝕝𝕖𝕤𝕤 𝕘𝕠𝕥𝕙𝕚𝕔 𝕞𝕠𝕣𝕖 𝕠𝕦𝕥𝕝𝕚𝕟𝕖.

𝙸𝚜𝚗'𝚝 𝚞𝚗𝚒𝚌𝚘𝚍𝚎 𝚐𝚛𝚎𝚊𝚝?

[nmstoker]

Yup, appears relatively hard to use via Chrome mobile with Gboard. You just about can, but most words get swallowed and the site popover is in the same place as the Android text assistance popover

[rglover]

𝔇𝔬𝔱𝔥 𝔨𝔫𝔬𝔴 𝔥𝔬𝔴 𝔱𝔬 𝔲𝔰𝔢 𝔰𝔞𝔦𝔡 𝔞𝔲𝔱𝔬𝔪𝔞𝔱𝔢𝔡 𝔠𝔬𝔪𝔭𝔲𝔱𝔢𝔯 𝔬𝔭𝔢𝔯𝔞𝔱𝔦𝔬𝔫?

[8xde0wcNwpslOw]

Also seems to support the "standard" shortcuts for formatting (Ctrl+I/U/B, perhaps others), but yeah, the introduction might be lacking.