Boris Smus, Chrome developer relations:

The basic idea is to hit the ground running with a prototype developed in JavaScript, get early feedback and then propose to W3C when you are ready.

  1. Propose a sane API that developers can use & implement it on top of existing API(s). (web developer)
  2. Solicit adoption and iterate on feedback. (web developer)
  3. Push through standardization. (spec author)
  4. Implement natively in browsers. (browser vendor)

Indeed!