[reeses]

"I [...] strongly disagree with the focus on "identical experience" amongst browsers. Instead, I prefer [...] graceful degradation [...]"

I fully agree. This is what we have accepted with the mobile web since the 1990s.

This is a smashing opportunity for web application frameworks to provide that sort of accessible experience while permitting more "flashy" features on more capable platforms.

A js meta-library that abstracted 1.9 and 2.x as long as possible would be worth a licensing fee for many sites. The others would make the decision based on their own analytics.