HTML 5: The Markup Language

h1heading (level 1) # T

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

Content model #

Attribute model #

Assertions #

Tag omission #

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

Permitted contexts #

Typical default display properties #

h1 {
display: block;
font-size: 2em;
margin: .67em 0 .67em 0;
font-weight: bold; }