title: Javascript Expression "document.body.getElementsByTagName();" Vs "document.getElementsByTagName();"
body: <p>Dear experts, I am quite new to javascript and I often see coders use those lines interchangeabaly.</p>
  
  <pre><code>document.body.getElementsByTagName();
  </code></pre>
  
  <p>and </p>
  
  <pre><code>document.getElementsByTagName();
  </code></pre>
  
  <p>What is the difference, benefits?</p>
  
  <p>Does this have anything to do with FF and IE?</p>