Javascript getelementbyid lookups - hash map or recursive tree traversal?

Posted by sash on Stack Overflow See other posts from Stack Overflow or by sash
Published on 2010-04-26T05:34:47Z Indexed on 2010/04/26 5:43 UTC
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JavaScript

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dom

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getelementbyid

Does the DOM have a hashtable of elements whose keys are the elements' ids? I want to know if document.getelementbyid() looks up a hash table or traverses the entire tree. Is this behavior different across browsers?

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