In .oo-ui-animation/.oo-ui-transition mixins we've currently included -ms-animation & -ms-transition. In the final published version of IE10 introducing CSS3 animations/transitions it supported unprefixed versions of those properties.
Citing from https://msdn.microsoft.com/en-us/library/hh772212%28v=vs.85%29.aspx
Do not use the Microsoft vendor prefix ("-ms-") before the CSS animations properties. They are supported unprefixed in Internet Explorer 10 and later.
So let's clean up and get rid of those.