Structuring Web Documents Programs

Program:

<xmp>
<h1>Heading 1</h1>
<h2>Heading 2</h2>
<h3>Heading 3</h3>
<h4>Heading 4</h4>
<h5>Heading 5</h5>
<h6>Heading 6</h6>

Output:

<div class="embed-responsive embed-responsive-16by9 box effect6" data-ce-key="155">
<iframe class="embed-responsive-item" src="http://www.atnyla.com/library/html/list-of-heading.html"></iframe>
</div>