penders - 7:46 pm on Jun 24, 2011 (gmt 0)
Firefox and Opera still support the <blink> element (as well as the CSS text-decoration:blink property). However, there are slight differences in rendering between these two browsers.
But as @lucy24 hints, it should be avoided in the real world. It is an accessibility/useability nightmare. It's considered annoying, distracting, harder to read and can cause problems for those with cognitive disabilities.