Difference between document.URL and location.href

I know that document.URL can not be set, while location.href can.

But the Document indicates:

URL is a replacement for the DOM Level 0 location.href property.

So when would we use document.URL?

Answer

You can get the document.URL, but you can not set it. You can both get and set the location.href.

In some webbrowsers, you are able to set the document.URL but please don’t, as it doesn’t work in most browsers.

You gave the answer yourself!

var currentURL = document.URL;
alert(currentURL);

Learn more here