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(event){
        $("span").text(event.timeStamp);
    });
});
</script>
</head>
<body>

<p>The click event occurred <span style="color:red">unknown</span> milliseconds after January 1, 1970.</p>

<button>Click me</button>

</body>
</html>