HTML: The Markup Language

h1heading # T

The h1 through h6 elements are headings for the sections with which they are associated.

Permitted contents #

Permitted attributes #

global attributes
Any attributes permitted globally.

Additional constraints and admonitions #

Tag omission #

An h1 element must have both a start tag and an end tag.

Permitted parent elements #

any element that can contain flow elements, hgroup

DOM interface #

interface HTMLHeadingElement : HTMLElement {};

Typical default display properties #

h1 {
display: block;
font-size: 2em;
margin-before: 0.67em;
margin-after: 0.67em;
margin-start: 0;
margin-end: 0;
font-weight: bold; }