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(){
        var txt = "";
        txt += "Width of div: " + $("#div1").width() + "</br>";
        txt += "Height of div: " + $("#div1").height();
        $("#div1").html(txt);
    });
});
</script>
<style>
#div1 {
    height: 100px;
    width: 300px;
    padding: 10px;
    margin: 3px;
    border: 1px solid blue;
    background-color: lightblue;
}
</style>
</head>
<body>

<div id="div1"></div>
<br>

<button>Display dimensions of div</button>

<p>width() - returns the width of an element.</p>
<p>height() - returns the height of an element.</p>

</body>
</html>