Javascript learning-dom understanding

Javascript represents the browser itself, webpage documents, and HTML elements in Webpage documents with corresponding built-in objects. The hierarchical relationships between these objects and objects are collectively referred to as Dom (Document Object Model, document Object Model)
Dom hierarchical relationship diagram:

Windows (representing browsers)
|____ Location
|____ Frames
|____ History
|____ Navigator
|____ Screen
|____ Document
|__ Links
|__ Anchors
|__ Images
|__ Filters
|__ Forms
|__ Applets
|__ Embeds
|__ Plusins
|__ Frames
|__ Ncipts
|__ All
|__ Selection
|__ Stylesheets
|__ Body