Not sure what the idea is here, even after reading the blog, it sounds like a concept like the 'data execution prevention bit' but for software with the browser voluntarily complying, so basically it's to stop people that are hacked from having their browser mess with stuff on sites, but obviously the hacker would simply disable that in the browser and it's back to square one, so it seems convoluted and silly and only leading to slowdowns.
But perhaps I misunderstand it?