HTML5 <aside> Tag

The HTML <aside> tag is used to define a section of a document whose content is connected tangentially to the main content of the document. This content is often presented as a sidebar.

The only content permitted inside this element is Flow content. Both the starting and ending tag are required for this element. The parent of the <aside> tag can be any element that accepts flow content. Note that an <aside> element must not be a descendant of an <address> element.

You should not use the <aside> element to wrap parenthesized text. That's because this kind of text is considered part of the main flow.

The following style is applied to this element by default:

aside {
  display: block;
}

Here is a basic example of using this tag:

<article>
  <p> A long article about America. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas.
    Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. </p>
  <aside>
    <p> California, a western U.S. state, stretches from the Mexican border along the Pacific for nearly 900 miles.
      Its terrain includes cliff-lined beaches, redwood forest, the Sierra Nevada Mountains, Central Valley farmland and the Mojave Desert. </p>
  </aside>
  <p> Some more information about America. Donec eu libero sit amet quam egestas semper. 
    Aenean ultricies mi vitae est. Mauris placerat eleifend leo. </p>
</article>

Attributes

This element only accepts global attributes.

Examples

See the Pen HTML aside Tag by Tutorialio (@tutorialio) on CodePen.

Further Reading

  1. Read more about the HTML <aside> element on MDN.
  2. You can also read the HTML <aside> tag reference on W3C.

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