<h6> HTML elements represent six levels of section headings.
<h1> is the highest section level and
<h6> is the lowest. By default, all heading elements create a block-level box in the layout, starting on a new line and taking up the full width available in their containing block.
|Content categories||Flow content, heading content, palpable content.|
|Permitted content||Phrasing content.|
|Tag omission||None, both the starting and ending tag are mandatory.|
|Permitted parents||Any element that accepts flow content.|
|Implicit ARIA role||heading|
|Permitted ARIA roles||
These elements only include the global attributes.
While using multiple
<h1> elements on one page is allowed by the HTML standard (as long as they are not nested), this is not considered a best practice. A page should generally have a single
<h1> element that describes the content of the page (similar to the document's
Note: Nesting multiple
<h1> elements in nested sectioning elements was allowed in older versions of the HTML standard. However, this was never considered a best practice and is now non-conforming. Read more in There Is No Document Outline Algorithm.
Prefer using only one
<h1> per page and nest headings without skipping levels.
The following code shows all the heading levels, in use.
<h1>Heading level 1</h1> <h2>Heading level 2</h2> <h3>Heading level 3</h3> <h4>Heading level 4</h4> <h5>Heading level 5</h5> <h6>Heading level 6</h6>
The following code shows a few headings with some content under them.
<h1>Heading elements</h1> <h2>Summary</h2> <p>Some text here…</p> <h2>Examples</h2> <h3>Example 1</h3> <p>Some text here…</p> <h3>Example 2</h3> <p>Some text here…</p> <h2>See also</h2> <p>Some text here…</p>
A common navigation technique for users of screen reading software is to quickly jump from heading to heading in order to determine the content of the page. Because of this, it is important to not skip one or more heading levels. Doing so may create confusion, as the person navigating this way may be left wondering where the missing heading is.
Don't do this:
<h1>Heading level 1</h1> <h3>Heading level 3</h3> <h4>Heading level 4</h4>
<h1>Heading level 1</h1> <h2>Heading level 2</h2> <h3>Heading level 3</h3>
Headings may be nested as subsections to reflect the organization of the content of the page. Most screen readers can also generate an ordered list of all the headings on a page, which can help a person quickly determine the hierarchy of the content:
h2Distribution and Diversity
When headings are nested, heading levels may be "skipped" when closing a subsection.
- Headings • Page Structure • WAI Web Accessibility Tutorials
- MDN Understanding WCAG, Guideline 1.3 explanations
- Understanding Success Criterion 1.3.1 | W3C Understanding WCAG 2.0
- MDN Understanding WCAG, Guideline 2.4 explanations
- Understanding Success Criterion 2.4.1 | W3C Understanding WCAG 2.0
- Understanding Success Criterion 2.4.6 | W3C Understanding WCAG 2.0
- Understanding Success Criterion 2.4.10 | W3C Understanding WCAG 2.0
Another common navigation technique for users of screen reading software is to generate a list of sectioning content and use it to determine the page's layout.
Sectioning content can be labeled using a combination of the
id attributes, with the label concisely describing the purpose of the section. This technique is useful for situations where there is more than one sectioning element on the same page.
Sectioning content examples
<header> <nav aria-labelledby="primary-navigation"> <h2 id="primary-navigation">Primary navigation</h2> <!-- navigation items --> </nav> </header> <!-- page content --> <footer> <nav aria-labelledby="footer-navigation"> <h2 id="footer-navigation">Footer navigation</h2> <!-- navigation items --> </nav> </footer>
In this example, screen reading technology would announce that there are two
<nav> sections, one called "Primary navigation" and one called "Footer navigation". If labels were not provided, the person using screen reading software may have to investigate each
nav element's contents to determine their purpose.
|HTML Standard |
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