[ChainsawSurgery]

Eh, this is a little bit of a tangent because there's no reason to block users ever I feel (and in this particular case blocking IE 10+ is stupid), but honestly? It's rarely worth the time to go through and make sure your site works on older browsers. Or that it degrades gracefully.

Yeah, if my site uses canvas, I should probably have a fallback for IE8. But in practice, and I know I'm not alone here: Unless I see that IE8 makes up a significant part of my site's traffic, fuck it.

There are already enough vendor issues between the latest versions of the big 4 (Chrome/FF/Safari/IE), spending more time going through old versions of those 4 will drive you bonkers.

It's rarely worth it and spending any amount of time catering to those users is almost assuredly not a good use of your time.