It's a strategy that's worked out very well. Standards groups and browsers prioritize backwards compatibility very highly. It's hard to remember any real compatibility breakages in standardized HTML/CSS/JS features (ie. not third-party plugins like Flash).
I guess it's the end of days, if tags have stopped blinking.
> And the beast shall come forth surrounded by a roiling cloud of vengeance. The house of the unbelievers shall be razed and they shall be scorched to the earth. Their tags shall blink until the end of days. — from The Book of Mozilla, 12:10
Challenge accepted.
https://developer.mozilla.org/en-US/docs/Glossary/blink_elem...