HTML and CSS Reference
This isn't an exhaustive list. There was a time when browser vendors were competing in terms of how many
weird tags they could add to HTML. A surprising number of those are still floating around unnoticed on web
A few of these may still work in some browsers. For instance, Firefox supports both marquee and blink .
However, neither scrolling nor blinking text is a good idea in the first place. These elements were left out of the
official HTML specs for good reason, and you should leave them out of your sites, too. You may want to look at
individual occurrences to see what more static styles you might replace these with.
xmp is another bogon that may actually have a raison d'être on your site, especially if the site is dedicated to
HTML tutorials or markup languages. It functions much like an XML CDATA section. That is, it interprets
everything inside the text as plain text, not markup. You could replace <xmp> with <![CDATA[ and </xmp> with
]]> . However, legacy browsers don't recognize CDATA sections, so you're better off just removing the xmp tags