[smitjel]

I don't know...IE9 isn't close to being released is it?

[powrtoch]

It's about to enter public beta... release is probably at least a year out.

[DanielBMarkham]

You'd have to browser-check and then load something like the jsTree stuff if it failed. That'd be a major pain.

But the performance and styling is looking really good. It's very tempting.