<h1>This is heading 1</h1>
<h2>This is heading 2</h2>
<h3>This is heading 3</h3>
//heading elements are H1 to H6 with H1 being the highest and H6
//the least.
<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>
