Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>  
<body ng-app="">

<p>Everything you write in the textarea will also be the content of the heading below:</p>

<textarea ng-model="myTextarea"></textarea>

<p>The content of the textarea is;</p>
<h1>{{myTextarea}}</h1>

</body>
</html>