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When ngAnimate is used, it will defer changes to classes until postDigest. Previously, AngularJS (when ngAnimate is not loaded) would always immediately perform these DOM operations. Now, even when the ngAnimate module is not used, if $rootScope is in the midst of a digest, class manipulation is deferred. This helps reduce jank in browsers such as IE11. BREAKING CHANGE: The $animate class API will always defer changes until the end of the next digest. This allows ngAnimate to coalesce class changes which occur over a short period of time into 1 or 2 DOM writes, rather than many. This prevents jank in browsers such as IE, and is generally a good thing. If you're finding that your classes are not being immediately applied, be sure to invoke $digest(). Closes #8234 Closes #9263