Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
<script>
$(document).ready(function(){
    $("button").click(function(){
        alert("Inner width of div: " + $("div").innerWidth());
    });
});
</script>
</head>
<body>

<div style="height:100px;width:300px;padding:10px;margin:3px;border:1px solid blue;background-color:lightblue;"></div><br>

<button>Display the inner width of div</button>
<p>innerWidth() - returns the inner width of an element (includes padding).</p>

</body>
</html>