title: document.getElementByTagName is not a function
body: <p>The code supposed to be use javascript between the <code>&lt;script&gt;</code> tags that
  consists of a mouseover event, and the list items in the HTML page must
  be styled as follows: normal - black, 12, bold and over yellow, 15, bold, italic.</p>
  
  <pre><code>&lt;html&gt;
  &lt;head&gt;
  &lt;title&gt; Using mouseover eve &lt;/title&gt;
  &lt;script language = "javascript"&gt;
  &lt;!--
      function changeStyle() {
  
          var item = document.getElementByTagName("li");
          item.style.color = "yellow";
          item.style.fontSize = "15pt";
              item.style.fontWeight = "bold";
          item.style.fontStyle = "italic";
  
      }
  --&gt;
  &lt;/script&gt;
  &lt;/head&gt;
  &lt;body&gt;
  &lt;ul style = "color: black; font-size: 12pt; font-weight: bold" &gt;
      &lt;li onMouseOver = "changeStyle()"&gt; item 1 &lt;/li&gt;
      &lt;li onMouseOver = "changeStyle()"&gt; item 2 &lt;/li&gt;
  &lt;/ul&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>