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Test Info:

<!DOCTYPE html>
<title>Layout using slot elements</title>
<link rel="author" title="Hayato Ito" href="mailto:hayato@google.com"/>
<link rel="match" href="reference/empty.html"/>
<div id="host"></div>
<script>
const host = document.querySelector('#host');
const sr = host.attachShadow({ mode: 'open' });
sr.innerHTML = '<slot><div id="fallback">Should not be displayed</div></slot>'
document.body.offsetLeft;
host.appendChild(document.createElement('div'));
</script>