Content headings. Don't use for presentation! Headings are to signify changes in content.

Example

Heading 1

Markup

<h1>Heading 1</h1>
<h2>Heading 1</h2>
<h3>Heading 1</h3>
<h4>Heading 1</h4>
<h5>Heading 1</h5>
<h6>Heading 1</h6>

Source: assets/sass/lib/elements/_typography.scss, line 34