<aside>
Tangential content loosely related to its surroundings: a callout box, a sidebar, a note.
- Display
- block
- Closing tag
- Required
- Permitted content
- Flow content without a
<main>element
Example
#<article>
<h2>What the DOM is</h2>
<p>The DOM is a tree of objects that the browser builds from your HTML code.</p>
<aside>
<strong>Fun fact:</strong> DOM stands for Document Object Model.
</aside>
<p>Every tag becomes a node in that tree.</p>
</article>Definition and usage
#The <aside> element holds content that supplements the main text but can be skipped without losing the meaning: a callout box with a fun fact, a glossary, a list of related articles, or a sidebar ad panel.
Inside an <article>, the element relates to that article, for example as a pull quote or a definition. Placed outside an article, it relates to the whole page and often acts as a sidebar.
Assistive technology recognizes <aside> as a "complementary" landmark. By default it has no particular look; you give it its side position in CSS.
Syntax
#<aside>
…
</aside>Attributes
#This element has no attributes of its own. It supports the global attributes, such as class, id and hidden.
Default CSS
#Most browsers display this element with these default styles:
aside {
display: block;
}Browser support
#Widely available
Works in all modern browsers, phones included. You can use it without worry.
- Chrome
- Edge
- Firefox
- Safari
Good practices
#- Don’t use
<aside>for a parenthetical remark in a sentence. A plain parenthesis or<small>is enough for a short in-text note. - If a page has several side panels, give them names with
aria-label.
Related entries
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