UI-Router "Hello World" app - Angular

<html>
  <head>
    <script src="//unpkg.com/show-current-browser-url"></script>
    <script src="//unpkg.com/angular@1.6.5/angular.js"></script>
    <script src="//unpkg.com/@uirouter/angularjs@1.0.5/release/angular-ui-router.js"></script>
   
    <script src="helloworld.js"></script>
    <style>.active { color: red; font-weight: bold }</style>
  </head>
  
  <body ng-app="helloworld">
    <a ui-sref="hello" ui-sref-active="active">Hello</a>
    <a ui-sref="about" ui-sref-active="active">About</a>
    
    <ui-view></ui-view>
  </body> 
</html>

var myApp = angular.module('helloworld', ['ui.router']);

myApp.config(function($stateProvider) {
  var helloState = {
    name: 'hello',
    url: '/hello',
    template: '<h3>hello world!</h3>'
  }
  
  var aboutState = {
    name: 'about',
    url: '/about',
    template: '<h3>Its the UI-Router hello world app!</h3>'
  }
  
  $stateProvider.state(helloState);
  $stateProvider.state(aboutState);
});

The angular-ui-router "Hello World" app