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<!DOCTYPE html>
<html>
<body>
<div id="myDiv" style="border:1px solid red;width:100px;height:100px;overflow:scroll;">
This is some text. This is some text. This is some text.
This is some text. This is some text. This is some text.
This is some text. This is some text. This is some text.
</div>
<br>
<button type="button" onclick="myFunction()">Return overflow</button>
<script>
function myFunction() {
  alert(document.getElementById("myDiv").style.overflow);
}
</script>
</body>
</html>