> Why not first implement these new features on your own browser as "developer version only", and prove that they work and do benefit users and the web in gener

> Why not first implement these new features on your own browser as "developer version only", and prove that they work and do benefit users and the web in general? Because of the real world needs. For example, Apple has been agressively pushing HTML5 features because they needed to offer alternative for Flash. (CSS effects, <video>, etc.)