I opened the link and only skimmed it, but I left the tab open in the background since it seemed like an interesting read to return to later.

Then they started to blink the tab title.

It's one thing that you do irritating stuff to get my attention when I'm actively on the website, but when I'm doing other things? This is right up there with popunder ads, blocking right click, and autoplaying sounds.

Instant close.