FAQ 206 (userpic comments) states, among other things, "Note that you cannot include HTML in your userpic comments". However, it's possible to use the lj user tag (which, while not *strictly* HTML, can be considered HTML or pseudo-HTML by a lot of users), so it might be worth changing to "Note that you cannot include HTML in your userpic comments, although the
LiveJournal-specific user tag is permitted, ..."
Yes? no? cookies?