title: CSS linking not working
body: <p>one of my students has the following code:
      </p>
  
  <pre><code>    &lt;title&gt; Portfolio
      &lt;/title&gt;
      &lt;link rel="stylesheet" type="text/css" src="portfolio1style.css"&gt;
  &lt;/head&gt;
  </code></pre>
  
  <p>portfolio1style.css is in the same file as HTML file and is definitely spelled correctly.
  the CSS works when we put it in the doc internally. 
  What's going on here?
  Thanks</p>