The <aside> represents a portion of a document whose content is only indirectly related to the document's main content. Asides are frequently presented as sidebars or call-out boxes.

Content categories Flow content, sectioning content, palpable content.
Permitted content Flow content.
Tag omission None, both the starting and ending tag are mandatory.
Permitted parents Any element that accepts flow content. Note that an <aside> element must not be a descendant of an <address> element.
Implicit ARIA role complementary
Permitted ARIA roles feed, none, note, presentation, region, search
DOM interface HTMLElement


This element only includes the global attributes.

Usage notes

  • Do not use the <aside> element to tag parenthesized text, as this kind of text is considered part of the main flow.


Using <aside>

This example uses <aside> to mark up a paragraph in an article. The paragraph is only indirectly related to the main article content:

    The Disney movie <cite>The Little Mermaid</cite> was
    first released to theatres in 1989.
      The movie earned $87 million during its initial release.
    More info about the movie...


Browser compatibilityUpdate compatibility data on GitHub

Chrome Edge Firefox Internet Explorer Opera Safari
aside 5 12 4 9 11.1 5
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
aside Yes Yes 4 11.1 4.2 Yes

See also

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