Well, at this site anyway. I try not to do it much. You won't find tons of internal monologues in italics, or fancy paragraph formatting. I paste in the text, and that's what you get.
Except for song lyrics.
The new chapter of The Magic of Bells has three sets of song lyrics. Thus, I had to try and remember how to do the line break so there wasn't a space between each line, as well as re-add the italics. Naturally, looking at the first version posted, it had the italics... and no lone break.
My second attempt said, screw the italics, let's see if we can just get it formatted like a song lyric. It hasn't reposted yet, but if the formatting seems a bit wonky, that's why.
It looks fine on my ASSTR page :)