* Marquee: To have a segment of text appear to scroll across the screen, use <marquee> and </marquee>. This tag will only work correctly on Internet Explorer for Windows; it can even cause some browsers to crash or not display the rest of the page properly. You should enclose marquees in the LiveJournal-specific <lj-cut> tag pair to hide text in a marquee tag.
Example: <lj-cut><marquee>This text is scrolling across the page.</marquee></lj-cut>
I can't list browsers that hate marquee, but IE for Windows certainly isn't the only one that accepts it (it's working in Firefox and Safari for me), so I suggest changing that part to:
Because this tag can cause some browsers to crash..., you should...
(Or strike the because and split into two sentences.)