Opening this page in Safari 9.1, will not show the "Hi I'm fixed" text in the lower-left corner. This is because its parent is animated, and Safari doesn't repaint the `position: fixed`-element after the animation.
Anything that triggers a repaint (e.g. resizing the window) will make the `position: fixed`-element show up.
Safari 5-8 and Safari 10 are not affected. I have not been able to test Safari 9.0
A possible fix is to animate the `position: fixed`-element after the animation of the parent has finished. Example: https://jsbin.com/biqura/edit?html,css,output