Why doesn't onload() work on vk.com?

Question

JavaScript

Through the console, being on the vk.com domain, I create a window:

var mdk_win = window.open('mudakoff', 'mdk_win', 'width=600,height=400');
mdk_win.onload = function(){
  alert('окно MDK загружено');
};

but for some reason onload() doesn't work. Prompt in what the reason, and how all the same to receive this event. Can it be replaced with something, for example, checking the existence of some element in the interval?

Answer 1

This is how it works:

var mdk_win = window.open('https://vk.com/mudakoff', 'mdk_win', 'width=600,height=400');
mdk_win.addEventListener('load', function(){
  console.log('окно MDK загружено');
});