| Definition |
A complementary landmark is a supporting section of the document, designed to be complementary to the main content at a similar level in the DOM hierarchy, but remains meaningful when separated from the main content.
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| ARIA 1.1 Specification |
complementary landmark
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| Coding Patterns |
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complementary landmarks should be top level landmarks (e.g. not contained within any other landmarks).
- If the complementary content is not related to the main content, a more general role should be assigned (e.g.
region).
- If a page includes more than one
complementary landmark, each should have a unique label (see Step 3 above).
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| Techniques |
- Use the HTML5
aside element to define a complementary landmark.
- If the HTML5
aside element technique is not being used, use a role="complementary" attribute to define a complementary landmark.
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| Headings |
- Each complementary landmark should have an
h2 element identifying the content of the landmark.
- If there are more than one complementary landmark on the page, use
aria-labelledby to reference the h2 elements for labeling each landmark.
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