Test Live: jQuery Update Textbox on Typing Another Textbox on Keyup

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<!doctype html>
<html lang="en">
<head>
<title>Test Live: jQuery Update Textbox on Typing Another Textbox on Keyup</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script>
$(document).ready(function(){
    $('#first-textbox').keyup(function(event) {
        var txtval = $(this).val();
        $('#second-textbox').val(txtval);
    });
})
</script>
</head>
<body>
<h1>jQuery Update One Textbox on Typing Another Textbox on Keyup</h1>
<input type="text" placeholder="Type here..." id="first-textbox"><br><br>
<input type="text" placeholder="This will automatically update" id="second-textbox">
</body>
</html>              
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