Wikipedia: The Browser Object Model (BOM) is a browser-specific convention referring to all the objects exposed by the web browser. Unlike the Document Object Model, there is no standard for implementation and no strict definition, so browser vendors are free to implement the BOM in any way they wish.
Investigating the Browser Object Model (BOM)
window
|
+---document
| |
| +---anchors
| |
| +---forms
| |
| +---links
| |
| +---images
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+---frames
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+---history
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+---location
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+---navigator
|
+---screen
+
+---console
For the document element and its element beneath see the Document Object Model.