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chromium/third_party/blink/web_tests/fast/block/basic/019.html 

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html lang="en-au">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title></title>
<style>
h1 { border: 3px solid red; }
</style>
</head>

<body>

<p>These &lt;h1&gt;s should all be left-aligned:</p>

<h1 style="width: auto;">sample</h1>
<h1 style="width: 10em;">sample</h1>

<p>These &lt;p&gt;s should be (and are) left-aligned:</p>

<p style="width: auto;">sample</p>
<p style="width: 10em;">sample</p>

</body>

</html>