Added description of browser support.

index.html

@@ -52,7 +52,8 @@
 </p>
 <p>
   The vis.js library is developed by <a href="http://almende.com" target="_blank">Almende B.V</a>,
-  as part of the <a href="http://chap.almende.com/" target="_blank">CHAP</a>.
+  as part of <a href="http://chap.almende.com/" target="_blank">CHAP</a>.
+  Vis.js runs fine on Chrome, Firefox, Opera, Safari, IE9+, and most mobile browsers (with full touch support).
 </p>