Which version of Angular/AngularJS does CiviCRM use?
How to check your Angular version


Go to the default Angular base page for your site at http://example.org/civicrm/a
Open a browser console
Evaluate angular.version within the console: 




Notes about Angular versions


1.x is called "AngularJS" and has documentation at docs.angularjs.org
2.x (onwards) is called "Angular", has significant changes from 1.x, and has documentation at angular.io/docs
CiviCRM (as of version 4.7.x) use AngularJS 1.x
Within AngularJS 1.x there are some changes between minor versions