Detecting the onload event of a window opened with window.open

by 
var myPopup = window.open(...);
myPopup.addEventListener('load', myFunction, false);

If you care about IE, use the following as the second line instead:

myPopup[myPopup.addEventListener ? 'addEventListener' : 'attachEvent'](
  (myPopup.attachEvent ? 'on' : '') + 'load', myFunction, false
);

As you can see, supporting IE is quite cumbersome and should be avoided if possible. I mean, if you need to support IE because of your audience, by all means, do so.

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