DOM Enlightenment Book

by peroli

HTML

<script src="https://getfirebug.com/firebug-lite-debug.js"></script>
<div id="blue">
  <div id="red"></div>
</div>

CSS

#blue {
  height: 100px;
  width: 100px;
  background-color: blue;
  border: 10px solid gray;
  padding: 25px;
  margin: 25px;
  position: absolute;
}

#red {
  height: 50px;
  width: 50px;
  background-color: red;
  border: 10px solid gray;
}

JavaScript

var div = document.querySelector('#red');

console.log(div.offsetLeft); //logs 25
console.log(div.offsetTop); //logs 25
console.log(div.offsetParent); //logs <body>