The Angular 2 animations documentation refers to the Web Animations API polyfill for browsers that don\'t support the native one.
What\'s the proper
Animations Performance Improvements
We’ve updated our implementation of Animations to no longer need the web animations polyfill. This means that you can remove this polyfill from your application and save approximately 47KB of bundle size, while increasing animations performance in Safari at the same time.
:-)
https://blog.angular.io/version-6-of-angular-now-available-cc56b0efa7a4