AngularJS Example:

HTML

<link rel="stylesheet" href="http://twitter.github.com/bootstrap/assets/css/bootstrap.css">
<div ng-app>
  <div ng-controller="TodoCtrl">
      <p>Working version: </p>
        <code ng-bind-html-unsafe="lines"></code>
      <p>Original version: </p>
      <code>{{lines}}</code>
  </div>
</div>

JavaScript

function TodoCtrl($scope) {
  $scope.lines = 'var x=1;<br />var y=2;';
}