I have just started to use jQuery in my web development and have a question concerning optimising element selection.
I find that I create a lot of references to id'd elements: <img id="myImage" src="todaysimage.gif" width="20" height="20" /> Then, in my JavaScript, I want to obtain a reference to the element. Now, even though it has an id, I tend to use the full CSS descriptor as, to me anyway, it makes the code more readable: $("img#myImage").addClass("border"); My question is, apart from the overhead of some extra characters in the script (e.g. 'img#'), does this style of specification introduce a performance overhead internally within jQuery? Would/does jQuery optimise the element selection process if it just 'sees' a simple id string starting with a #? $("#myImage").addClass("border"); Thanks.