<h1>Heading 1</h1>
<h2>Heading 2</h2>
<h3>Heading 3</h3>
<h4>Heading 4</h4>
<h5>Heading 5</h5>
<h6>Heading 6</h6><h1>I'm the biggest heading</h1>
<h2>I'm smaller than h1</h2>
<h3>I'm smaller than h2</h3>
<h4>I'm smaller than h3</h4>
<h5>I'm smaller than h4</h5>
<h6>I'm the smallest heading</h6><h1>Biggest<h1>
<h2>Pretty Big<h2>
<h3>Medium<h3>
<h4>Pretty Small<h4>
<h5>Very Small<h5>
<h6>Smallest<h6><!DOCTYPE html>
<html>
<body>
<h1> Heading </h1>
<h2> Sub Heading 1 </h2>
<h3> Sub Heading 2 </h3>
<h4> Sub Heading 3 </h4>
<h5> Sub Heading 4 </h5>
<h6> Sub Heading 5 </h6>
</body>
</html><h1></h1>
<h2></h2>
<h3></h3>
<h4></h4>
<h5></h5>
<h6></h6><h1>Page title</h1>
<h2>Subheading</h2>
<h3>Tertiary heading</h3>
<h4>Quaternary heading</h4>
<h5>five heading</h5>
<h6>six heading</h6><h1> The biggest heading size </h1>
<h6> The smallest heading size </h6><body>
<hgroup>
<h1>ACME Corporation</h1>
<p>The leaders in arbitrary fast delivery since 1920</p>
</hgroup>
...<h1>Im a heading</h1>