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<!DOCTYPE html>
<html>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"></script>
<body ng-app="">
<input ng-keyup="count = count + 1" ng-init="count=0" />
<h1>{{count}}</h1>
<p>This example will increase the value of the variable "count" every time a keypress in the input field is finished.</p>
</body>
</html>