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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, minimum-scale=1.0">
  <title>JS Bin</title>
</head>
<body>
  <div class="outer">
    <div class="inner"></div>
  </div>
</body>
</html>
 
.outer {
  background: green;
  padding: 50px;
  float: left;
}
.inner {
  background: blue;
  padding: 100px;
}
 
new MutationObserver(function() {
  console.log('mutate');
}).observe(document.body, {
  attributes: true
});
function onClick() {
  console.log('click');
  
  setTimeout(function() {
    console.log('timeout');
  },0);
  
  Promise.resolve().then(function() {
    console.log('promise');
  });
  
  document.body.setAttribute('data-random', Math.random());
}
document.querySelector('.inner').addEventListener('click', onClick);
document.querySelector('.outer').addEventListener('click', onClick);
//document.querySelector('.inner').click()
Output 300px

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jakearchibaldpro
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