[cmpb]

I just updated Safari to 10.0 without being on macOS, so it's presumably standalone. Some features (i.e. picture in picture) might not work as well, but indexedDB has been in Safari for a while, so I'm sure the updates to it are supported everywhere.

[bergie]

Actually, I think this is the first Safari version where IndexedDB works. They shipped a broken implementation earlier.

[hackmiester]

Wait, what? What other OS is it out for?

[saurik]

(That comment is using "macOS" to differentiate from older builds of "OS X".)

[knd775]

I think you're hung up on the name change. It's now macOS, whereas it used to be OS X. When the parent poster is says macOS, they mean the latest version of OS X/macOS.