anchor.diff:          return '';
         };
       </pre>
  -    Here return_url is the url of the tool consumer to which result has to be
  -    returned and urlParams contains launch url of exercise that tool consumer
  -    will add in the Submission Tool URL. <br><br>
  +    Here <em>return_url</em> is the url of the tool consumer to which result
  +    has to be returned. <em>urlParams</em> contains the launch url of the
  +    exercise, that tool consumer will add in the Submission Tool URL. <br><br>
   
       Once Submission Tool URL is added, instructors can publish the exercise to
  -    make that exercise available for students. <br><br>
  -
  -    This is how OpenDSA makes use of LTI, which allows the OpenDSA exercises to
  -    be seamlessly added into the courses in Learning Management Systems.
  +    make that exercise available for students. <br>
   
     </span>
   </div>
  
positive.code:     </pre>
      The code above is executed on the selection of an exercise. This code
      calls the <em>getResourceURL</em> method, which generates the URL.
      Following is a code of the <em>getResourceURL</em> method.<br><br>
      <pre>
        var getResourceURL = function (obj) {
          if (!$.isEmptyObject(obj)) {
  
negative.code:     <br><br>
  
      Within the <em>resource</em> endpoint, the first thing that OpenDSA checks
      is that this a known LMS instance by calling the
      <em>ensure_lms_instance</em> method. For example, Virginia Tech's Canvas
      instance (canvas.vt.edu) is different from Instructure's public Canvas
      instance (canvas.instructure.com). This information is used to create the
      correct URL that will be embedded in the exercises at the end.
      <br><br>
      <pre>
      def resource
        lms_instance = ensure_lms_instance()
      </pre>
      Within "<em>ensure_lms_instance</em>", OpenDSA creates a new LMS
      instance if it does not already exist. <br><br>
      <pre>
      def ensure_lms_instance
  