HTML5 and real ip detecting

we know with flash and java objects some sites can grab the real ip if we even use proxy , but what about html 5 ?
now i use firefox 4 and scare if google and other sites detect my real ip by HTML 5 ...

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I'm not aware about any bugs, it's also unlikely.

But in general I have seen bugs in the Internet Explorer causing it to ignore the proxy settings, so I'd avoid IE if possible and in general disable Java and Flash if you want to go sure.
There are a few nice addons for FF allowing you to disable/enable these features on-demand.

all language can be secure and html is the best language security