Object Lookup
If you want to find out information about properties of the main DOM object - document - type document in the Object Lookup's input line and click "process"-button. White area above Object Lookup will be filled with properties (in red color; not all - default View Filter is applied) of document object together with their value. More examples below, full description of functionality in  Tutorial .
To find out information about your browser try: navigator
Information about your screen: screen
Information about location of this file and used protocols: location
For security reasons some properties of history object are not accessible: history
These are synonyms: window, self, clear line. All three give you the information about window object, the root object of every file.
Information about type of the document: document.doctype
Collection of all elements in this file: document.getElementsByTagName('*')
Properties of the first element: document.getElementsByTagName('*')[0]
Collection of all DIVs in this file: document.getElementsByTagName('div')
Properties of the first DIV: document.getElementsByTagName('div')[0]
Style properties of the first DIV: document.getElementsByTagName('div')[0].style
attribute object of the first DIV: document.getElementsByTagName('div')[0].attributes
Properties of the first attribute of the first DIV: document.getElementsByTagName('div')[0].attributes[0]
Array of childNodes of the first DIV: document.getElementsByTagName('div')[0].childNodes
Information about the first child of the first DIV: document.getElementsByTagName('div')[0].childNodes[0]
Properties of the nextSibling node of the first DIV: document.getElementsByTagName('div')[0].nextSibling
styleSheets assocciated with this file: document.styleSheets
Properties of the first styleSheet object: document.styleSheets[0]
Array of CSS rules in the first styleSheet object: document.styleSheets[0].cssRules
Properties of the second CSS rule in the first styleSheet object: document.styleSheets[0].cssRules[1]
DOM debugger
JavaScript debugger