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<!DOCTYPE html>
<html>
<head>
<meta name="description" content="Dom Mouse Event Properties">
  <meta charset="utf-8">
  <title>DOM Mouse Event Properties</title>
</head>
<body>
  
  <div id="outerBox">
    <div id="innerBox"></div>
  </div>
  
</body>
</html>
 
#outerBox {
  position: absolute;
  left: 300px;
  top: 80px;
  background-color: green;
}
​
#innerBox {
  margin: 20px;
  width: 160px;
  height: 40px;
  background-color: yellow;
}
​
 
window.onload = function () {
  
  var inbox = document.getElementById('innerBox');
  
  inbox.addEventListener('mouseover', mouseOver);
  inbox.addEventListener('mouseout', mouseOut);
  
  function mouseOver () {
    js.log('mouse over relatedTarget ID: ', event.relatedTarget.id);
    js.log('mouse over target ID: ', event.target.id);
  }
  
   function mouseOut () {
    js.log('mouse out relatedTarget ID: ', event.relatedTarget.id);
    js.log('mouse out target ID: ', event.target.id);
  }
};
​
//// utils
var js = {
  lineNumber: 1
};
​
js.log = function(text) {
  var node, child, lineText;
​
  node = document.getElementById('result');
  if (!node) {
    node = document.createElement('div');
    node.id = 'result';
    document.body.appendChild(node);
  }
​
  child = document.createElement('div');
​
  lineText = js.lineNumber + '.';
  lineText = Array.isArray(text) ? lineText + '[' + text + ']' : lineText + text;
​
  if (arguments.length > 1) {
    for (var k = 1; k < arguments.length; k++) {
      lineText += arguments[k];
    }
  }
​
  child.innerText === undefined ? child.textContent = lineText : child.innerText = lineText;
​
  node.appendChild(child);
  js.lineNumber += 1;
  return this;
};
​
Output

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