IE 11 enable animations
Testing multiple browsers is something every web developer looks forward to.
IE 11 can be a real treat, especially if in Compatability Mode.
Make sure your first meta tag inside head is:
<meta http-equiv="X-UA-Compatible" content="IE=edge">
This will disable compatability mode.
Another weird aspect of IE 11 is that you have to enable animation playing.
Options / Advanced / Multimedia / Play animations in webpages.