How to detect a click event on a cross domain iframe

gistfile1.js

var iframeMouseOver = false;

window.addEventListener('blur',function(){
  if(iframeMouseOver){
    console.log('Wow! Iframe Click!');
  }
});

document.getElementById('YOUR_CONTAINER_ID').addEventListener('mouseover',function(){
   iframeMouseOver = true;
});
document.getElementById('YOUR_CONTAINER_ID').addEventListener('mouseout',function(){
    iframeMouseOver = false;
});