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!