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<!DOCTYPE html>
<html>
<script src='https://code.jquery.com/jquery-3.5.1.min.js'
integrity='sha256-9/aliU8dGd2tb6OSsuzixeV4y/faTqgFtohetphbbj0='
crossorigin='anonymous'></script>
<body>
<h1>Heading1</h1>
<h2>Heading2</h2>
<p>Paragraph</p>
<button>Button</button>
<div id="log"></div>
<script>
let previous;
$('button').click(function (event) {
current = Date.now();
if (previous !== undefined)
$('#log').html(`${current-previous} ms`);
previous = current;
})
</script>
</body>
</html>
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