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Thank you!

Underline does work. You are probably viewing it on Ecency?.
But this is what it shows on Peakd for example.

Screenshot_20220707-061621_Chrome.jpg

I tried to leave out what doesn't work on Ecency, but Underline is nice and shouldn't be left out.

I'm assuming Ecency is messing up how the whole post is viewed on a mobile device too. (It breaks images and alignments on smaller screens, so the whole post might look like a mess.. Except tables, which what I'm assuming is the case)

It doesn't work on hive.blog and Ecency.

And yes, Peakd is implementing it! Perhaps you could add a warning or something to the guideline, since it's not a generalized feature.

Ahh, thank you for pointing that out! I didn't check that one on hive.blog, I did include such disclaimer in the text portion at the top, however.

Different Frontends will show things differently, and some things may not work at all on some Frontends.

I don't want to take it out from the post as an option for people. :(

I guess I will edit the post and add that info to each tag that doesn't work on all. (The <u> and <q> as far as I'm aware)

Again, thank you for pointing it out!