Dom Note (i): HTMLDocument interface

The first step in manipulating an HTML document is to get a reference to the document element, where each element is a node in the DOM, and all the elements form a node tree in the DOM.

The method used to get the element node definition is defined in the HTMLDocument interface, the Window.document method is used to implement the interface, and the common methods and properties of its definition are as follows:

Property or method	return value type	Description
[Getter]	Any type	Gets all element nodes based on the element's Name property
All	Htmlallcollection	A collection of all the elements in the document that are deprecated
Body	HtmlElement	Get <body> element node
Head	Htmlheadelement	Get
Images	Htmlcollection	Get all ELEMENT nodes
Embeds	Htmlcollection	Get all <embed> ELEMENT nodes
Plugins	Htmlcollection	Equivalent to the Embeds property
Links	Htmlcollection	Gets all <a> and <area> element nodes with the href attribute
Forms	Htmlcollection	Get all <form> ELEMENT nodes
Scripts	Htmlcollection	Get all <script> ELEMENT nodes
Getelementsbyname ()	NodeList	Gets all element nodes based on the element's Name property
Getelementsbyclassname ()	NodeList	Get all ELEMENT nodes based on the class property of the element

In addition, the HTMLDocument interface inherits the document interface of the core DOM, inheriting the following properties and methods:

Property or method	return value type	Description
DocumentElement	Element	Get the root element of XML or HTML,
getElementById ()	Element	Gets the specified element based on the ID property value
getElementsByTagName ()	NodeList	Get all element nodes based on element name
Getelementsbytagnamens ()	NodeList	Gets all element nodes based on the element name of the specified namespace

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Dom Note (i): HTMLDocument interface