h4

The h4 HTML element represents a heading for the section with which it is associated.

<h4 attribute-name="attribute-value"></h4>

Global

h4 {
    display: block;
    font-weight: bold;
    margin: 1.33em 0 1.33em 0;
}

h1

h2

h3

h5

h6

Web Hypertext Application Technology Working Group (WHATWG)