HTML 5 Timeline

Firefox 2.0.0.10 broke its implementation of the HTML5 canvas element and guess what, the world noticed. Actual websites started breaking because they relied on the canvas functionality to work. The point is that we expect implementations of HTML5 to happen way before the fifteen year mark. In fact, the fifteen year mark includes having all features at least implemented in two different (shipping) products in the same way with the additional requirement that they have a decent amount of market penetration. This means that when the specification finally makes it to W3C Recommendation it has already proven itself.

van Kesteren, Anne. annevankesteren.nl (2007). Articles>Web Design>Standards>HTML5