NN6 Javascript and DOM documentation?

[Siegfried Heintze]

I've been poking around http://www.mozilla.org/newlayout/xml/ and all I can
find is specifications. Does not there have to be some special features like
IE data islands?

Where can I find documentation to explain code like
"document.getElementById('main').style.backgroundColor =
(cb.checked?'white':'black');"?

        Thanks,
              Siegfried