Is site first item in history?

How to find out if site is the first item in history? This doesn't work because of security reasons:

if(window.history.item(0)==window.locatio开发者_C百科n.href)

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For security reasons the History object doesn't allow the non-privileged code to access the URLs of other pages in the session history, but it does allow it to navigate the session history.

From: Mozilla Developer Center: window.history

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You cannot.

The users' browser history is private information and cannot be read using Javascript.