Does jQuery do any kind of caching of “selectors”?

Question

For example, will the first piece of code perform a full search twice, or is it smart enough to cache results if no DOM changes have occurred?

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Answer 1

John Resig in his Jquery Internals talk at jQuery Camp 2008 does mention about some browsers supporting events which are fired when the DOM is modified. For such cases, the Selctor results could be cached.