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HTML Document Element Tree

HTML documents consists of a tree of these elements and they specify how HTML documents should be built, and what kind of content should be placed in what part of an HTML document.

Example of a basic HTML5 Document Tree

<!DOCTYPE html>
<html lang=en>
<head>
<meta charset=UTF-8>
<title>Document</title>
</head>
<body> </body>
</html>