It is used to define content that is indirectly related to the main content of a document.
It is often represented by sidebars or explanatory boxes. It can also be used to mark the ads on a page.
It should not be used to label a text in parentheses, as it is considered part of the main content.
Has an implicit ARIA role complementary.
- Type: block
- Self-closing: No
- Semantic value: Yes
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