Realistically, the standards comittees follow where the implementations lead. And the problem with implementations is that all the large companies making them would much prefer to be either monopolists or drastically advantaged by the choice of technology. Whose native toolkit should it most resemble: Microsoft's, Apple's, or Google's?

The web is a mine-strewn no-mans-land between competing factions, which accounts for a lot of the strangeness.

(Ironically, the tech is leaking in the other direction as web apps become more popular on both mobile and desktop)