Title was a bit rage-baity. And I think you can already do sanitation by writing a function to check input before passing it to innerHTML?

This really just seems like another attempt at reinventing the wheel. Somewhat related, I find it ironic how i cannot browse hacks.mozilla.org in my old version of firefox("Browser not supported"). Also, developer.mozilla.org loads mangled to various degrees in current versions of palemoon, basilisk, and seamonkey

It's like there is some sort of "browser cartel" trying to screw up The Web.