Question

A couple of questions actually,

Given that the following two will return the same result set

$("#MyTable tr");
$("tr", "#MyTable");

is there any difference in performance between using the Parent-Child CSS selector convention or specifying a context to the selector instead?

Also, given that I can guarantee a tr will be an immediate child of a table, would this improve upon the performance of the above?

$("#MyTable>tr")

Answer 1

$("#MyTable > tr") may not actually work as you should have either thead/tfoot or tbody as the direct child of the table. I think ff/chrome etc will add the tbody in for you therefore the selector should be

$("#MyTable > tbody > tr")