Example
Header 1
Header 2
Header 3
Header 4
Header 5
Header 6
Markup
<h1>Header 1</h1>
<h2>Header 2</h2>
<h3>Header 3</h3>
<h4>Header 4</h4>
<h5>Header 5</h5>
<h6>Header 6</h6>
Source:
1_Typography/typography.less
, line 31