Page history - back button exists?

Question

Is it possible check if there is a value for history.go(-1)? I know you can't access history.previous directly.

I am trying to stay away from document.referrer because I know it can be blocked in some instances.

Here is what I am trying to do. I have an error page, on this page I would like to either have a BACK button (if it's not the only item in history) or a close button (if it is).

Answer 1

if (history.length) {
    //There is history to go back to
    history.go(-1);
}

Answer 2

If the history has a length greater than 0, then it contains at least one history point.

if (history.length)