The Objects are organized in a hierarchy. This hierarchical structure applies to the organization of objects in a Web document.
- Window object − Top of the hierarchy. It is the utmost element of the object hierarchy.
- Document object − Each HTML document that gets loaded into a window becomes a document object. The document contains the contents of the page.
- Form object − Everything enclosed in the <form>...</form> tags sets the form object.
- Form control elements − The form object contains all the elements defined for that object such as text fields, buttons, radio buttons, and checkboxes.
The following is a simple hierarchy of a few important objects −
