<!DOCTYPE html>
<html>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<body ng-app="">
<p>Try writing in the input field:</p>
<form name="myForm">
<input name="myInput" ng-model="myInput" required>
</form>
<p>The forms's valid state is:</p>
<h1>{{myForm.$valid}}</h1>
<p>The input field is required, so the form's valid state will not become true as long as the value is empty.</p>
</body>
</html>