What is the Document Object Model?

The Document object represents the HTML document displayed in this window. Document objects have various properties that reference other objects and allow access to and modification of document contents.

The way to access and modify the content of the document is called the document object Model, or DOM. Objects are organized hierarchically. This hierarchy is suitable for object organization in Web documents.

• Window Object - The top of the hierarchy. It is the most important element of the object hierarchy.
• Document Object - Each HTML document loaded into the window becomes a document object. The document contains the content of the page.
• Form Object - Everything contained within the
  ...
  tag sets the form object.
• Form Control Elements - A form object contains all the elements defined for the object, such as text fields, buttons, radio buttons, and checkboxes.

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