title: What is the line mean? "this.parentNode.firstChild.nodeName" in jQuery Hilghlight plugin
body: <p>What is the use of the line</p>
  
  <pre><code>this.parentNode.firstChild.nodeName
  </code></pre>
  
  <p>in following code from jQuery Highlight plugin.</p>
  
  <p><a href="http://johannburkard.de/blog/programming/javascript/highlight-javascript-text-higlighting-jquery-plugin.html" rel="nofollow">http://johannburkard.de/blog/programming/javascript/highlight-javascript-text-higlighting-jquery-plugin.html</a></p>
  
  <pre><code>jQuery.fn.removeHighlight = function () {
    return this.find("span.highlight ").each(function () {
      this.parentNode.firstChild.nodeName;
      with(this.parentNode) {
        replaceChild(this.firstChild, this);
        normalize();
      }
    }).end();
  };
  </code></pre>