Monkey Raptor

We can access the browser session history object length by using:
history.length
It will return the number of browsing session history.

In other browsers other than Internet Explorer (less than or equal to 9 version, maybe) genre, the current page is also added as a history object element. Thus, it will return 1 even though we have nowhere to go to.
(Old) Internet Explorer will return 0 if you have no other page to go to (previous/next).

The new Internet Explorer (10 - 11) behaves like the other ones now. More of Chrome-like looks.

If we flush/empty the browsing history, then it will also reset the amount of length of history.

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No returned value
For security reason, this object doesn't return any value, except the read-only length.

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Methods
The (cross-browser) available methods are:

• back()

  Action:

  the current window will change state to the previous page if the previous page exists.

  Example:

  history.back()

  This has no returned value.

• forward()

  Action:

  the current window will change state to the next page if the next one exists in the object.

  Example:

  history.forward()

  This has no returned value.

• go(integer)

  Action:

  can go back or forward.

  Examples:

  • history.go(-1) is equivalent with history.back()
  • history.go(1) is equivalent with history.forward()

  This also has no returned value.
  If the integer we put is out of bound, the method will return nothing (no error).

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I made an animation with the JavaScript itself to capture and show your browser history.length below.

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Link for further exploration

• Window.history at Mozilla Developers Network
• Independent page of the doodle at Thor

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Updated Nov 17, 2014