The tag was never an official standard, and is now completely abandoned by all browsers.
Is there a standards compliant way of making text blink?
If you're looking to re-enable the blink tag for your own browsing, you can install this simple Chrome extension I wrote: https://github.com/etlovett/Blink-Tag-Enabler-Chrome-Extension. It just hides and shows all tags on every page using setInterval.