if the link had a background color to begin with, you would use that color rather than "" in the script.</p>
         </section>
         <pre xml:space="preserve">
...
&lt;script&gt;
 function toggleFocus(el)
 {
  el.style.backgroundColor =  el.style.backgroundColor=="yellow" ? "inherit" : "yellow";
 }
&lt;/script&gt;

...

&lt;a href="example.html" onfocus="toggleFocus(this)" onblur="toggleFocus(this)"&gt;focus me&lt;/a&gt;
...
</pre>
      </section>
   </section><section class="tests"><h2>Tests</h2>
   