​x
 
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<!doctype html>
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<html>
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  <head>
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    <meta charset="utf-8">
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    <title>HTML5 headings demo</title>
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  </head>
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  <body>
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    <h1>Heading 1</h1>
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    <h2>Heading 2</h2>
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    <h3>Heading 3</h3>
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    <h4>Heading 4</h4>
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    <h5>Heading 5</h5>
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    <h6>Heading 6</h6>
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  </body>
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</html>
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​