How are objects organized in web documents? How is it arranged hierarchically?

Objects are organized hierarchically. This hierarchical structure is suitable for the organization of objects in Web documents.

• Window object − The top of the hierarchy. It is the highest element of the object hierarchy.
• Document Object − Each HTML document loaded into the window becomes a document object. Documents contain the content of pages.
• Form Object − All content contained in the
  ...
  tag is set to a form object.
• Form Control Elements − A form object contains all the elements defined for the object, such as text fields, buttons, radio buttons, and check boxes.

The following is a simple hierarchy of some important objects −

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