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<!DOCTYPE html>
<html>
<head>
<style>
#myDiv {
  border: 1px solid #FF0000;
}
</style>
</head>
<body>
​
<div id="myDiv" style="margin:2cm 4cm 3cm 5cm;">This is a div.</div>
<br>
<button type="button" onclick="myFunction()">Return margin</button>
​
<script>
function myFunction() {
  alert(document.getElementById("myDiv").style.margin);
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_style_margin3 by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:03:40 GMT -->
</html>
​
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