Q: How many unique tags are in this HTML document?

<html>
<head><title>CSS at last</title></head>
<body>
<h1>My First CSS Page</h1>
<h2>Introduction</h2>
<p>Now that I know HTML, I’m making it look pretty with CSS. 
Join me for some styled links and images!</p>
<hr/>
<h2>Rejoice! An Image</h2>
<img src="apple.jpg" alt="an apple" />
<hr/>
<h2>Now Go Places!</h2>
<ul>
<li><a href="http://www.youtube.com">YouTube</a></li>
<li><a href="http://www.google.com">Google</a></li>
</ul>
</body>
</html>


A: 12. html, head, title, body, h1, h2, p, hr, img, ul, li, a (in that order)