On WebGL, we can reinvent presentation and styling entirely without sacrificing performance. Doing layout and capturing input events on elements in Javascript

On WebGL, we can reinvent presentation and styling entirely without sacrificing performance. Doing layout and capturing input events on elements in Javascript instead of native code, without performance loss? Nah. Maybe you can do it in shaders, but that still sounds like the bad old days of flash, of binary blob websites without accessibility. I'd be glad to be proved wrong, but it just sounds horrible. Oh, but WebGL games need good UI toolkits either way, so at worst, any such stuff would still be useful for that, even if not for general websites.