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WAI-ARIA: aria-checked (State)

Description

Indicates the current “checked” state of checkboxes, radio buttons, and other widgets. See related aria-pressed and aria-selected.

The aria-checked attribute indicates whether the element is checked (true), unchecked (false), or represents a group of other elements that have a mixture of checked and unchecked values (mixed). Most inputs only support values of true and false, but the mixed value is supported by certain tri-state inputs such as a checkbox or menuitemcheckbox.

The mixed value is not supported on radio, menuitemradio, switch or any element that inherits from these in the taxonomy, and user agents MUST treat a mixed value as equivalent to false for those roles.

Example

HTML Example

<span role="checkbox" 
aria-checked="true"
tabindex="0"
id="simulatedcheckbox">
</span>

Characteristics

Used in Roles

  • checkbox
  • option
  • radio
  • switch

Inherits into Roles

  • menuitemcheckbox
  • menuitemradio
  • treeitem

Values

  • tristate
    • Value representing true or false, with an intermediate “mixed” value. The default value for this value type is False, unless otherwise specified.

  • false
    • The element supports being checked but is not currently checked.
  • mixed
    • Indicates a mixed mode value for a tri-state checkbox or menuitemcheckbox.
  • true
    • The element is checked.
  • undefined (default)
    • The element does not support being checked.

Semantic HTML

Use the HTML “checked” attribute.

<form action="/action_page.php">
<input type="checkbox" name="vehicle" value="Bike"> I have a bike<br>
<input type="checkbox" name="vehicle" value="Car" checked> I have a car<br>
<input type="submit" value="Submit">
</form>

Reference

W3C (opens new window)

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