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I don't know what browser the judges will be using, so if they happen to use IE (just like a large number of web game players) and your game isn't playable in IE, then you might have a small problem
Well, that's how you should think when you're making a regular web game as well It's not really practical for visitors to make them download and learn to use a new browser just to play your game. Generally you want to be able to get as many players as possible, and since people are very lazy, you need to make it easy for them to get started immediately.
By the way, it looks like siege server uses Java.