<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<style>
* {
margin: 0;
padding: 0;
}
div {
border: 10px solid #000;
width: 200px;
height: 200px;
background-color: red;
margin: 20px;
padding: 20px;
}
</style>
</head>
<body>
<div></div>
<script>
var aDiv = document.getElementsByTagName("div")[0];
console.log(aDiv.style.width);
console.log(aDiv.scrollWidth);
console.log(aDiv.offsetWidth);
</script>
</body>
</html>
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