Well, W3C may recommend against blinking text in their accessibility guidelines, and apparently all modern browsers have removed the text-decoration: blink CSS property and <blink> tag support.
However, you know how important this functionality is. After all, what calls more attention than FULL CAPS BOLD BLINKING TEXT?
(okay, imagine that the full caps text is blinking, I can't hack JS or <style> into a github markdown file afaik)
Just for fun. Yes, you may actually include this in your CSS reset if you'd like.