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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
<div class="outer">
  <div class="inner">a</div>
</div>
</body>
</html>
 
#outer{
  background-color:red;
  width:150px;
  height:150px;
  margin: 50px;
}
​
#inner{
  background-color:blue;
  width:100px;
  height:100px;
  margin: -10px;
}
 
var outer = document.getElementById("outer");
function listener(e){
  console.log(e.type, e.path, e);
  e.preventDefault();
}
​
outer.addEventListener('mouseenter',listener);
outer.addEventListener('mouseover',listener);
outer.addEventListener('mouseout',listener);
Output 300px

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