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Table of contents
HTML DOM
DOM HOME
DOM Intro
DOM Nodes
DOM Node Tree
DOM Methods
DOM Node Access
DOM Node Info
DOM How To
DOM Events
DOM Reference
DOM Summary

DOM Examples
DOM Examples

DOM Objects
DOM Window
DOM Navigator
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DOM History
DOM Location

DOM Document

DOM Anchor
DOM Area
DOM Base
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DOM Event
DOM Form
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DOM Frameset
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DOM Image
DOM Input Button
DOM Input Checkbox
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DOM Input Submit
DOM Input Text
DOM Link
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HTML DOM Node Tree

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The HTML DOM views a HTML document as a node-tree.

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


The HTML DOM Node Tree (Document Tree)

The HTML DOM views a HTML document as a tree-structure. The tree structure is called a node-tree.

All nodes can be accessed through the tree. Their contents can be modified or deleted, and new elements can be created.

The node tree below shows the set of nodes, and the connections between them. The tree starts at the root node and branches out to the text nodes at the lowest level of the tree:

DOM HTML tree


Node Parents, Children, and Siblings

The nodes in the node tree have a hierarchical relationship to each other.

The terms parent, child, and sibling are used to describe the relationships. Parent nodes have children. Children on the same level are called siblings (brothers or sisters).

  • In a node tree, the top node is called the root
  • Every node, except the root, has exactly one parent node
  • A node can have any number of children
  • A leaf is a node with no children
  • Siblings are nodes with the same parent

Look at the following HTML fragment:

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

In the HTML above, every node except for the document node has a parent node:

  • The <html> node has no parent node; the root node
  • The parent node of the <head> and <body> nodes is the <html> node
  • The parent node of the "Hello world!" text node is the <p> node

Most element nodes have child nodes:

  • The <html> node has two child nodes; <head> and <body>
  • The <head> node has one child node; the <title> node
  • The <title> node also has one child node; the text node "DOM Tutorial"
  • The <h1> and <p> nodes are siblings, and both child nodes of <body>

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