Status: This is an in-progress, unapproved draft.

Headings add structure and meaning to pages by labeling each content part and indicating the relative importance of those parts.

Assistive technologies and some browsers provide mechanisms to present a list of headings to the user that allows users to jump to individual headings. Headings also provide visual clues that help to skim the page or find a specific section, this is especially useful for people that are easily distracted.

Heading levels

It is good practice to nest headings properly. When stepping down through headings, skipping levels should be avoided. That means that an <h1> is followed by an <h1> or <h2>, an <h2> is followed by a <h2> or <h3> etc. When stepping up through headings it is perfectly legitimate to skip any number of levels.

Note: HTML5 has introduced an outline algorithm that assigns heading levels based on how deep sectioning elements are nested inside each other, regardless of the actual heading level. At the time of writing, this is not supported by any browser or assistive technology and should not be used.

Organize main page content

When looking at the content, the highest available heading level should be used to mark up the heading of the main content, as this makes it easy to discover. Ideally use an <h1> or <h2>.

Code snippet: Showing only headings
<h1>An inside look at the new SpaceBear 8™</h1>
  <h2>Cotton Fur</h2>
  <h2>Sapphire Eyes</h2>
  <h2>Synthetic Felt Paws</h2>

Organize page sections

Similar to landmarks, headings can be used to give users a way of navigating through web pages. To do this, each section of the page (for example navigation) has its own heading, describing what can be found in the section. Often the heading levels are similar to this example:

Code snippet: Showing only headings
<h1>SpaceTeddy Inc.</h1>
    <h3>More news</h3>
    <h3>What our clients say</h3>
  <h2>An inside look at the new SpaceBear 8™</h2>
    <h3>Cotton Fur</h3>
    <h3>Saphire Eyes</h3>
    <h3>Syntetic Felt Paws</h3>
    <h3>About the company</h3>
    <h3>Our retail stores</h3>

The first heading in such cases is usually the page name. In this case, the heading of the actual content is hard to find between headings that describe the page structure. If possible use labeled landmarks to mark up the page structure as the provide more meaning to assistive technologies.

The following WCAG 2.0 resources are directly related to this page. Relationship to WCAG 2.0 provides more background information.

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