HTML5 is entirely not working!

1) When I try to type in chat by entering a message and pressing enter (I also tried pressing the green send button), nothing happens and the message disappears.
2) Whenever I log on, I can only see the messages in chat from the exact moment that I log on. I can't see the new messages people are writing or anything else.
3) Whenever I join a game and its on the starting screen, the game freezes and I lose connection.
Can anyone fix/explain these issues?