You can still post <blink> elements. But they don't work anymore at least not in Firefox since version 23, when they removed the feature from the browser.
Back further I believe marquee did work here but it can really make a mess without the closing tag!
It looks like FR strips out <marquee> elements. But they still work in both Chrome and Firefox. You can read Mozilla's documentation on the tag here.
I’ve always used Internet Explorer and I used to do a lot of graphic posting using ‘tables’ with several images over a background. Hesitated to change browsers because I know what I’m doing here, lol.
Yea, they stopped the blink and marquee long ago - but I can still use them and javascript in my webpages!!