Animation in general is just plain broken in Yosemite (and iOS 8). I'm not up to date with the latest frameworks, but I believe there's been a fundamental API c

Animation in general is just plain broken in Yosemite (and iOS 8). I'm not up to date with the latest frameworks, but I believe there's been a fundamental API change, because its basically possible to break any animation by just causing an event to happen before its finished. This happens all the time in iOS, you can get it to break mid-rotation and end up in a half and half state: https://twitter.com/tolmasky/status/532578692804124672 https://twitter.com/tolmasky/status/532578692804124672 On OS X, its the same thing. Here's me easily repro-ing in Safari: http://tolmasky.com/letmeshowyou/Yosemite/Safari%20Animation.mov http://tolmasky.com/letmeshowyou/Yosemite/Safari%20Animation...