title: Is there a <# #> tag? and If not what use could it have in this code
body: <p>I recently inspected the source of some website and saw the following code</p>
  
  <pre><code>&lt;script type="text/html" id="tmpl-playlist-settings"&gt;
      &lt;h2&gt;Playlist Settings&lt;/h2&gt;
  
      &lt;# var emptyModel = _.isEmpty( data.model ),
          isVideo = 'video' === data.controller.get('library').props.get('type'); #&gt;
  
      &lt;label class="setting"&gt;
          &lt;input type="checkbox" data-setting="tracklist" &lt;# if ( emptyModel ) { #&gt;
              checked="checked"
          &lt;# } #&gt; /&gt;
          &lt;# if ( isVideo ) { #&gt;
          &lt;span&gt;Show Video List&lt;/span&gt;
          &lt;# } else { #&gt;
          &lt;span&gt;Show Tracklist&lt;/span&gt;
          &lt;# } #&gt;
      &lt;/label&gt;
  
      &lt;# if ( ! isVideo ) { #&gt;
      &lt;label class="setting"&gt;
          &lt;input type="checkbox" data-setting="artists" &lt;# if ( emptyModel ) { #&gt;
              checked="checked"
          &lt;# } #&gt; /&gt;
          &lt;span&gt;Show Artist Name in Tracklist&lt;/span&gt;
      &lt;/label&gt;
      &lt;# } #&gt;
  
      &lt;label class="setting"&gt;
          &lt;input type="checkbox" data-setting="images" &lt;# if ( emptyModel ) { #&gt;
              checked="checked"
          &lt;# } #&gt; /&gt;
          &lt;span&gt;Show Images&lt;/span&gt;
      &lt;/label&gt;
  &lt;/script&gt;
  </code></pre>
  
  <p>I recognized the code uses the "echoing" style of php ( putting code html inside a conditional IF statement), although the code is inside <code>&lt;# #&gt;</code>.
  I've never seen that approach before. What use could it have?</p>