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HTML DOM Node Tree

All the nodes in a node tree have relationships to each other.

Document Tree (Node Tree)

Look at the following HTML document:

<html>
  <head>
    <title>DOM Tutorial</title> 
  </head> 
  <body> 
    <h1>DOM Lesson one</h1> 
    <p>Hello world!</p> 
  </body> 
</html>

All the nodes above have relationships to each other.

Every node except for the document node has a parent node. E.g. the parent node of the <head> and <body> nodes are the <html> node, and the parent node of the "Hello world!" text node is the <p> node.

Most element nodes have child nodes. E.g. the <head> node has one child node: the <title> node. The <title> node also has one child node: the text node "DOM Tutorial".

Nodes are siblings when they share a parent. E.g. the <h1> and <p> nodes are siblings, because their parent is the <body> node.

Nodes can also have descendants. Descendants are all the nodes that are children of a node, or children of those children, and so on. E.g. all text nodes are descendants of the <html> node, while the first text node are descendant of the <head> node.

Nodes can also have ancestors. Ancestors are nodes that are parents of a node, or parents of this parent, and so on. E.g. all text nodes have the <html> node as an ancestor.

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