Originally Posted by Old Pedant
Is it to be a multi-player game? If so, you won't do it with HTML and JS alone. You will need some sort of server-side support.
that may have been arguably true last week, but not anymore, and it's going to be really untrue within 6 months.
look into webRTC if you have not done so already, it's already/almost here...
BROWSER STATS [% share]
(2013/10/31) IE7:0.5, IE8:8.6, IE9:5.3, IE10:12.3, FF:17.7, CH:41.8, SF:8.1, MOBILE:20.4