> The problem would of course be that you would have to keep around a different browser to render old sites. Not really, you could polyfill the missing feature

> The problem would of course be that you would have to keep around a different browser to render old sites. Not really, you could polyfill the missing features like it's commonly done with many unimplemented new ones. I'd prefer starting from scratch, with a completely new, simple language that can be translated quickly to HTML/CSS/JS. You'd have to remove those interested in being gatekeepers of the web and sabotaging any efforts to make browsers simpler from the W3C though.