Communicate between tabs dom without window ref [duplicate]

Answer 1

Parent page JavaScript:

var lastMessage;
setInterval(function() {
  var message = localStorage.getItem('message-to-parent');
  if (message && message !== lastMessage) {
    lastMessage = message;
    // your code here
    alert('There is a new message for you: ' + message);
  }
}, 100);

Child page JavaScript:

localStorage.setItem('message-to-parent', 'hello, my parent!');

If you have a lot of animations and other huge JS code, I'd suggest to increase the timer interval, or better to solve the issue with window.