JSFiddle - React, Tailwind, and code Playground

HTML

<div ng-app>
    <div data-ng-controller="HelloWorldCtrl">
        <label>Message :
            <input ng-model="message">
        </label>
        <h1>{{message}}</h1>
    </div>
</div>
<script type="text/javascript">
    function HelloWorldCtrl($scope){
        $scope.message = "Hello World!";
        $scope.$watch('message', function(){
            $scope.message = $scope.message.replace('e', 'E');
        });
    }    
</script>