Ask HN: What's the best javascript charting library?

I know this question has been asked several times on HN.

http://news.ycombinator.com/item?id=1847515 http://news.ycombinator.com/item?id=854926 http://news.ycombinator.com/item?id=2764708

But since all the posts are almost 2-3 years old, I'd like to ask it again, as there must have been major changes in the technologies and libraries since then.

Requirements: -Support as many chart types as possible. -Cross browser compatibility. -Rich and interactive

Thanks.