classList polyfill included for ie9

index.html

@@ -209,7 +209,11 @@
 		</div>
 		
 		<script src="js/reveal.js"></script>
+
+		<!-- Optional libraries for code syntax highlighting and classList support in IE9 -->
 		<script src="lib/highlight.js"></script>
+		<script src="lib/classList.js"></script>
+
 		<script>
 			// Parse the query string into a key/value object
 			var query = {};