just in case this is useful for us:
http://javascriptly.com/2008/08/yui-30-changes-from-the-root/

"
5 goals:
        • Lighter (less K-weight on the wire and on the page for most uses)
        • faster (fewer http requests, less code to write and compile, more  
efficient code)
        • more consistent (common naming, event signatures, and widget APIs  
throughout the library)
        • more powerful (do more with less implementation code)
        • more securable (safer and easier to expose to multiple developers  
working in the same environment; easier to run under systems likeCaja  
or ADsafe)
[...]
So, what’s new in YUI 3.0? Many things, both large and small like:
        • Intelligent loading. YUI detect which modules it needs to load, and  
then download them from a server — it will also join the modules’  
JavaScript source files together, in order to optimize download time.
        • Change to a “YUI” namespace instead of “Yahoo” namespace in YUI 2.x  
branches.
        • Combine DOM events with custom events, making it possible to work  
with all events in a unified way.
        • Borrow “selectors” idea from JQuery to allow finding and working  
with nodes on an individual and group basis.
        • Chaining - another JQuery’s idea that makes it possible to write  
more compressed chaining syntax in implementation code.
"

Thanks
-Vincent

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