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<!DOCTYPE html>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<p>
Focus on the text field, then focus on the url bar and navigate to another
site.
<br />
<input id="nameInput" />
<script>
nameInput.addEventListener("focus", event => {
addEventListener("beforeunload", e => {
document.body.innerHTML = "<h1>beforeunload fired</h1>";
e.preventDefault();
});
});
</script>
</p>