A complete fresh html code with angularJs to demonstrate how ng-app calling by default for angularJs App. Bootstrap not required for It if you have single ng-app.
<html>
<head>
<title>Default ng-app' in angularJs by asptricks.net</title>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.3.14/angular.min.js"></script>
</head>
<body ng-app="">
<div>
<input type="text" ng-model="name" maxlength="240">
<span ng-bind="240- name.length + 'rem.'"></span>
</div>
</body>
</html>