How does Gmail do comet on Opera?

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Published on 2010-04-17T06:04:55Z Indexed on 2010/04/17 6:13 UTC
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I would like to know how Gmail (or anyone else) does comet on Opera.

Here is what I know so far from my experiments.

It doesn't use the event-source tag which is broken in Opera 10.51.
It doesn't use iframe which displays a spinning throbber and a busy mouse cursor.
It doesn't use responseText on xmlhttprequest when readyState = 3 which is known to be broken on Opera.

I tried seeing how it was done in mibbit and etherpad, and I found that they both use long-polling.

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