var app = angular.module('plunker', ['ngAnimate']);

app.controller('MainCtrl', function($scope, $timeout) {
  $scope.name = 'World';
  
  $scope.showDeleteConfirm = false;
  
  $scope.toggle = function() {
    $scope.showDeleteConfirm = !$scope.showDeleteConfirm;
    // $timeout(function() { $scope.showDeleteConfirm = !$scope.showDeleteConfirm; }, 1000);
  }
    
});
<!DOCTYPE html>
<html ng-app="plunker">

  <head>
    <meta charset="utf-8" />
    <title>AngularJS Plunker</title>
    <script>document.write('<base href="' + document.location + '" />');</script>
    <link rel="stylesheet" href="style.css" />
    <link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css" />
    <script data-require="angular.js@1.2.x" src="https://code.angularjs.org/1.2.28/angular.js" data-semver="1.2.28"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.2.14/angular-animate.js"></script>
    <script src="app.js"></script>
  </head>

  <body ng-controller="MainCtrl">
    <p>Hello {{name}}!</p>
    
    <!-- <div class="cssFade" ng-click="toggle()" ng-show="!showDeleteConfirm">
      <button type="button" class="btn btn-default">Delete</button>
    </div>
    <div class="cssFade" ng-click="toggle()" ng-show="showDeleteConfirm">
      <button type="button" class="btn btn-default">Cancel</button>
      <button type="button" class="btn btn-default">Confirm Delete</button>
    </div> -->
    
    <button type="button" class="btn btn-default cssFade" ng-click="toggle()" ng-show="!showDeleteConfirm">Delete</button>
    <button type="button" class="btn btn-default cssFade" ng-click="toggle()" ng-show="showDeleteConfirm">Cancel</button>
    <button type="button" class="btn btn-default cssFade" ng-click="toggle()" ng-show="showDeleteConfirm">Confirm Delete</button>
  </body>

</html>
/* Put your css in here */

.ng-hide-add, .ng-hide-remove {
    display: inline !important;
}

.cssFade {
    transition: 0.2s linear all;
    opacity: 1;
}
.cssFade.ng-hide {
    opacity: 0;
}