input autofocus (#564)

examples/chat/home.html

@@ -92,7 +92,7 @@ body {
 <div id="log"></div>
 <form id="form">
     <input type="submit" value="Send" />
-    <input type="text" id="msg" size="64"/>
+    <input type="text" id="msg" size="64" autofocus />
 </form>
 </body>
 </html>