index.html

<!doctype html>
<html>
<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <title>Mocha Spec Runner</title>
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/mocha/3.5.3/mocha.min.css">
</head>
<body>
  <div id="mocha"></div>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/mocha/3.5.3/mocha.min.js"></script>
  <script>mocha.setup('')</script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/chai/4.1.2/chai.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.4.0/lodash.min.js"></script>
  <script  src="https://cdnjs.cloudflare.com/ajax/libs/sinon.js/4.0.0/sinon.min.js"></script>
  <script>
    var assert = chai.assert;
    var expect = chai.expect;
    var should = chai.should();
  </script>

  <!-- include spec files here... -->
  <script src="index.spec.js"></script>

  <script>mocha.run()</script>
</body>
</html>