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is it webkit based??..

Yes, from the About Opera menu item:

Browser identification

... AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.52 Safari/537.36 OPR/15.0.1147.130

I really like the "OPR" thing to subtly avoid UA sniffing :)

It is based on chromium including blink, which is a webkit fork, so yes, it is.