Well, I must say what do you expect? Introduced 10 years ago is the OS you run with?
And who's fault is that? First MS takes ages to create a monster (Vista) and then another two years to get to W7. Plus that millions are still running XP (e.g. companies) worldwide and it will cost millions to upgrade something that is still running good. How about throwing money away big time.
And a browser should be OS independent and fall back gracefully if the OS it runs on doesn't support features it might require.