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<!DOCTYPE html>
<html>
<script>
let previous;
function measure() {
current = Date.now();
if (previous !== undefined)
document.getElementById('log').innerHTML = `${current-previous} ms`;
previous = current;
}
</script>
<body>
<h1>Heading1</h1>
<h2>Heading2</h2>
<p>Paragraph</p>
<button onclick='measure()'>Button</button>
<div id="log"></div>
</body>
</html>
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