htmlThe root node is the "" node. The "" tag tells the browser that this is an HTML document. It is the outermost element in the HTML document, that is, the root element. The html tag is a container for all other HTML elements except the "" tag.

The operating environment of this tutorial: Windows 7 system, HTML5 version, Dell G3 computer.

htmlThe root node is the "" node.

HTML DOM Node Tree

HTML DOM treats HTML documents as a tree structure. This structure is called a node tree:

Default HTML snippet

   
  
DOM节点
 
Hello world!
  

From the HTML above:

• ## node has no parent node; it is the root node. The
  # tag tells the browser that this is an HTML document. The tag is the outermost element in an HTML document. The tag is a container for all other HTML elements (except the tag).

• The parent node of and is the node

• The text node "Hello world!" The parent node is the

  node

• The node has two child nodes: and < ;body>

• node has one child node:

• and

  nodes are sibling nodes and are also child nodes of

• element is the first child node of the element

• element

##

The element is the first child node of the element

element is the last child node of the

element
Recommended tutorial: "

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