The ArchWiki actually has a very subtle use of the <blink> tag on its "Color Bash Prompt" page[1]. While it could easily be done with CSS3, I quite like its use there.

[1] https://wiki.archlinux.org/index.php/Color_Bash_Prompt#A_wel...

Being able to see a website the same way it was supposed to be 20 years ago is one of the best browser feature imho !