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==Implementations==
Because the DOM supports navigation in any direction (e.g., parent and previous sibling) and allows for arbitrary modifications, implementations typically buffer the document.<ref>{{Cite book|url=https://books.google.com/books?id=HuSQGrRY7F4C|title=Ajax Black Book, New Edition (With Cd)|last=Kogent Solutions Inc.|publisher=Dreamtech Press|year=2008|isbn=978-8177228380|pages=40}}</ref>. However, a DOM need not originate in a serialized document at all, but can be created in place vi the DOM API. Also, there have been implementations even before DOM itself, of equivalent structure with persistent disk representation and rapid access,
===Layout engines===
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