Afaik, Prototype in opera uses xpath for selecting nodes. However since 9.02 
(http://www.opera.com/docs/changelogs/windows/902/) opera supports presumably 
faster methods selectNodes and selectSingleNode, predecessors of Selector API 

I think it's a good idea to use them when possible. Of course opera 9.5 would 
implement querySelector itself, but lots of people will continue to use 
versions prior to 9.5 for some time.

arty ( http://arty.name )

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