Ah, good catch. It's 5.1 that doesn't support it at all. I was working on a new feature last week, and it looked great on Firefox and Chrome (my main dev browse

Ah, good catch. It's 5.1 that doesn't support it at all. I was working on a new feature last week, and it looked great on Firefox and Chrome (my main dev browsers), but both my boss and UX designer use Macbooks so when I asked them to check it out they both said it's broken. It was because I was working quickly and didn't put in all of the backward compatibility hacks yet. So, my memory was a bit fuzzy about which versions supported what, exactly.