I hate that the play/pause button controls Safari over iTunes, too. A downright horrible design implementation. Equally as worse is when videos stop playing in Safari, and when you close the tab that contained the video, the play/pause button then controls nothing. It won't resume with iTunes. It just sits there doing absolutely nothing. I'll repeat, it has no control over anything.
So we've got a crazy, good for nothing feature combined with a freaking software bug. What the hell is going on at Apple?
Oh, that's right, emoji development.
If they could just revert rewind F7, play/pause F8, and fast forward F9 control to how it worked in every previous Macintosh OS version ever, all would be well.