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

I was implementing 'close' button for popup window screen and 'cancel' button for '_self' window in "Typescript/Nodejs" and believe it will work for JavaScript as well. So I needed to determine if screen is opened in a popup

if(window.opener || window.history.length === 1) 
     isPopupWindow = true;
else 
   isPopupWindow = false;

"window.opener" works for almost all the browsers but having issue with IE so to handle IE issue I used "window.history.length".