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

app.controller('MainCtrl', function($scope,$sce) {
  $scope.snippet =  '<p style="color:blue">an html\n' +
          '<em onmouseover="this.textContent=\'Siva Phaneendra\'" onmouseout="this.textContent=\'click here\'">click here</em>\n' +
          'snippet</p>';
  
  $scope.chengetrusthtml=function(){
    return $sce.trustAsHtml($scope.snippet);
  };
});
<!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" />
    <script src="https://code.angularjs.org/1.2.25/angular.js"></script>
    <script src="https://code.angularjs.org/1.2.25/angular-sanitize.js"></script>
    <script src="app.js"></script>
  </head>

  <body ng-controller="MainCtrl">
    <p>Example on ng-Sanitize</p>
    <textarea rows="10" columns="10" ng-model="snippet"></textarea>
    
    <h2>Textarea data parsed with ngSanitize</h2>
    <div ng-bind-html="snippet"></div>
    
    <h2>Textarea data as trustedhtml</h2>
    <div ng-bind-html="chengetrusthtml()"></div>
    
    <h2>Textarea data parsed ng-bind</h2>
    <div ng-bind="snippet"></div>
  </body>

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