Well, you should still send the entire document over, so network
traffic is still the same. The browser would store the entire
document but render it selectively. The lag time would frustrate the
users otherwise - almost a second to open up a level of a hierarchy.
Say - could this be implemented as a browser feature using the
CLASS or ROLE attribute on a <DIV> tag? Same thing on a <UL> or <OL>
or <DL> of course, and the there are the <Hn>s - ok generalize it:
any (container?) tag could potentially be an outline element.
This could also be controlled through stylesheets... I think folding/
unfolding outline levels is a browser rendering feature, not something
that requires net tags. It needs a well defined ROLE or CLASS or
something, but that should suffice.
Christian "webhead <*>"