Edit in JSFiddle

function Ctrl($scope) {
  $scope.message = "Waiting 2000ms for update";
    
    setTimeout(function () {
        $scope.message = "Timeout called!";
        // AngularJS unaware of update to $scope
    }, 2000);
}

<div ng-app ng-controller="Ctrl">
 {{message}}
</div>
<!-- app and ctrl in same dom, doesn't update, need apply -->

</style>
<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.2.12/angular.min.js"></script>
<style>