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Element vs Node

Written byPhuoc Nguyen
23 May, 2020
Imagine that a web page is constructed by a tree of nodes. Considering a common HTML page has a structure like this:
<!DOCTYPE html>
<meta ... />
The root node of tree is a document node which has two children, the `doctype` and the `html` tag. The `html` tag is constructed by its children, `head` and `body`, and so on.
Each node has a property named `nodeType` which is a number to identity its type. It can be used to distinguish the kind of node from other one. For example, the following `div` has only one child node whose value is `Hello`:
The `div` node is an element node, while its child node (`Hello`) is a text node. The following table taken from MDN shows the popular node types:
  • `Node.ELEMENT_NODE` (1): An element node which is a HTML tag, such as `<div>`, `<p>` , etc.
  • `Node.TEXT_NODE` (3): The actual text inside an element node
  • `Node.COMMENT_NODE` (8): A comment node, such as `<!-- ... -->`
  • `Node.DOCUMENT_NODE` (9): A document node
  • `Node.DOCUMENT_TYPE_NODE` (10): A document type node, such as `<!DOCTYPE html>`
In a nutshell, a node represents a single node in the document tree, and an element is a particular type of node which is a HTML tag.
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