JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.1/angular.min.js"></script>
<link href="//netdna.bootstrapcdn.com/twitter-bootstrap/2.1.0/css/bootstrap-combined.min.css" rel="stylesheet" type="text/css" />
    
<div ng-app>
    <div ng-controller="MyCtrl">
        Number field: <input type="number" ng-model="Number" required />
        <br />
        Result: {{Number}}
    </div>
</div>

CSS

.ng-invalid.ng-dirty {color: red;}

JavaScript

function MyCtrl($scope) {
    $scope.Number = 10.05;
}