Angular placeholder binding

HTML

<script src="http://code.angularjs.org/1.2.1/angular.js"></script>
<div ng-controller="MyCtrl">
    <textarea rows="3" type="text" placeholder="{{placeholderValue}}"></textarea>
</div>

JavaScript

var myApp = angular.module('myApp',[]);

myApp.controller("MyCtrl", function ($scope) {
    $scope.placeholderValue = 'Supesadferhero';
});