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* DOM Level 4 was published in 2015. It is a snapshot of the WHATWG living standard.<ref>{{cite web|url=https://dom.spec.whatwg.org/|title=W3C DOM4|access-date=8 January 2021}}</ref>
==[[Software development|Applications]]==
===Web browsers===
To [[Web browser engine|render]] a document such as a HTML page, most web browsers use an internal model similar to the DOM. The nodes of every document are organized in a [[tree structure]], called the ''DOM tree'', with the topmost node named as "Document object". When an HTML page is rendered in browsers, the browser downloads the HTML into local memory and automatically parses it to display the page on screen. However, the DOM does not necessarily need to be represented as a tree,<ref name="Level3-Introduction">{{cite web|url=https://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407/introduction.html|title=What is the Document Object Model?|access-date=2021-09-12|publisher=W3C|quote=However, the DOM does not specify that documents must be implemented as a tree or a grove, nor does it specify how the relationships among objects be implemented. The DOM is a logical model that may be implemented in any convenient manner.}}</ref> and some browsers have used other internal models.<ref name="Modernizing-Dom">{{cite web|url=https://blogs.windows.com/msedgedev/2017/04/19/modernizing-dom-tree-microsoft-edge/|title=Modernizing the DOM tree in Microsoft Edge|date=19 April 2017|access-date=2021-09-12|publisher=Microsoft}}</ref>
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