I watched the John Resig presentation too and learned that CSS
selectors always work from right to left.
That would mean that doing this::
$('#foo p')
Would extract all <p> tags and from that list subselect those who
belong to #foo. Suppose you have 1000 <p> tags of them only 100 are
inside #foo you'll have wasted 900 loops.
Surely $('#foo') is the fastest lookup possible. Doing it this way
will effectively limit the scope of the $('p') search and you will
never be bothered about any <p> tags outside #foo.
Or am I talking rubbish?
