404.html

<!DOCTYPE html>
<script src="/link-fixup.js" defer></script>
<title>404 Not Found</title>
<style>
 body.loading div.failed, body.failed div.loading, div.failed { display: none; }
 body.loading div.loading, body.failed div.failed, div.loading { display: block; }
</style>
<body onload="document.body.className = 'failed'">
<script>document.body.className = 'loading'</script>
<div class="loading">
 <p>Loading...</p>
</div>
<div class="failed">
 <h1>Not Found</h1>
 <p>The page you are looking for is no longer available at this URL.</p>
 <p>Links to the multipage version of the specification are
 unfortunately likely to break over time. You might be able to find
 what you want from <a href="/multipage/">the contents page</a>.</p>
 <p>If you have found a broken link on the WHATWG site itself, please
 <a href="https://github.com/whatwg/html/issues/new">file an issue</a>.
 If you found a broken link from another site pointing to the WHATWG site,
 please let that site know of the problem instead. Thanks!</p>
</div>