test.html

<html>
<head>
  <script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
  <link href="https://cdn.quilljs.com/1.1.6/quill.snow.css" rel="stylesheet">
  <script src="https://cdn.quilljs.com/1.1.6/quill.js"></script>
  <style>
  #editor {
    height: 375px;
  }
  </style>
</head>
<body>

  <!-- Create the editor container -->
  <div id="editor">
    <p>Hello World!</p>
    <p>Some initial <strong>bold</strong> text</p>
    <p><br></p>
  </div>

  <!-- Initialize Quill editor -->
  <script>
    var quill = new Quill('#editor', {
      theme: 'snow'
    });
  </script>

</body>
</html>