h6

The h6 HTML element represents a heading for the section with which it is associated.

<h6 attribute-name="attribute-value"></h6>

Global

h6 {
    display: block;
    font-size: .67em;
    font-weight: bold;
    margin: 2.33em 0 2.33em 0;
}

h1

h2

h3

h4

h5

Web Hypertext Application Technology Working Group (WHATWG)