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which is faster

 
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Which of the two is faster or efficient when selecting the element: I need to get the innermost div (marked with innerDiv class)

var element = document.getElementById("main");
var elementNeeded = element.querySelector(".innerDiv");

or:

var elementNeeded = document.querySelector("#main .innerDiv");

 
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It'd be easy enough to make timing tests to find out (I talk about this in chapter 2 of Secrets of the JavaScript Ninja) but I'd ask why you are interested unless there are demonstrable performance issues with one or the other. Just curiosity?

The results are also likely to be browser-dependent.
 
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