vbnet/winforms/ObservePageChanges/page.html

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<!DOCTYPE html>
<html>
<head>
    <title>index</title>
</head>
<body>
<div>
    <span class="countdown" id="countdown"></span>
</div>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"
        crossorigin="anonymous"></script>
<script type="text/javascript">
    $(document).ready(function () {
        var counter = 1;
        setInterval(function() { $(".countdown").text(counter++); }, 1000);
    });
</script>
</body>
</html>