Check whether a window is Popup or not?

Question

This question is not the duplicate of if window is popup , But a similar one.

I am developing a extension which injects scripts to all web pages. I need to detect w

Answer 1

For me, i was implementing a Logout screen that could be shown in a window popup via window.open(..) or from a link within a single page.

I needed to determine:

1) if my Logout screen is within a popup, then:

event.preventDefault();
window.close();

2) otherwise use the browser back function..

window.history.back();

My solution: If the page is within a popup, in my case it has a window page history of 1:

event.preventDefault();
if (window.history.length === 1) {
    window.close();
} else {
    window.history.back();
}