WAI-ARIA: aria-setsize (Property)
Description
Defines the number of items in the current set of listitems or treeitems. Not required if all elements in the set are present in the DOM. See related aria-posinset.
This property is marked on the members of a set, not the container element that collects the members of the set. To orient the user by saying an element is “item X out of Y,” the assistive technologies would use X equal to the aria-posinset attribute and Y equal to the aria-setsize attribute.
If all items in a set are present in the document structure, it is not necessary to set this property, as the user agent can automatically calculate the set size and position for each item. However, if only a portion of the set is present in the document structure at a given moment (in order to reduce document size), this property is needed to provide an explicit indication of set size.
Authors MUST set the value of aria-setsize to an integer equal to the number of items in the set. If the total number of items is unknown, authors SHOULD set the value of aria-setsize to -1.
When exposing aria-setsize on a menuitem, menuitemcheckbox, or menuitemradio, authors SHOULD set the value of aria-setsize based on the total number of items in the menu, excluding any separators.
Browser Compatibility
| desktop | mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
ariaSetSize | ChromeFull support84 | EdgeFull support84 | FirefoxNo supportNo | Internet ExplorerNo supportNo | OperaFull support70 | SafariFull support12.1 | WebView AndroidFull support84 | Chrome AndroidFull support84 | Firefox for AndroidNo supportNo | Opera AndroidFull support60 | Safari on iOSFull support12.2 | Samsung InternetFull support14.0 |
aria-setsize Example
HTML Example
The following example shows items 5 through 8 in a set of 16.
<h2 id="label_fruit">Available Fruit</h2>
<ul role="listbox" aria-labelledby="label_fruit">
<li role="option" aria-setsize="16" aria-posinset="5">apples</li>
<li role="option" aria-setsize="16" aria-posinset="6">bananas</li>
<li role="option" aria-setsize="16" aria-posinset="7">cantaloupes</li>
<li role="option" aria-setsize="16" aria-posinset="8">dates</li>
</ul>HTML Example 2
The following example shows items 5 through 8 in a set whose total size is unknown.
<h2 id="label_fruit">Available Fruit</h2>
<ul role="listbox" aria-labelledby="label_fruit">
<li role="option" aria-setsize="-1" aria-posinset="5">apples</li>
<li role="option" aria-setsize="-1" aria-posinset="6">bananas</li>
<li role="option" aria-setsize="-1" aria-posinset="7">cantaloupes</li>
<li role="option" aria-setsize="-1" aria-posinset="8">dates</li>
</ul>Characteristics
Used in Roles
Inherits into Roles
Value
- integer
- A numerical value without a fractional component.
Semantic HTML
No HTML element equivalent.
Reference
- WAI-ARIA 1.2 Specification
Refer to the notes from the WAI-ARIA 1.2 specification for more information on aria-setsize. - MDN Web Docs
The browser compatibility for each of the ARIA attributes is taken from the MDN Web Docs. Please refer to the original source if browser compatibility is updated for aria-setsize.
Explore more on DigitalA11Y Insights
Similar Posts
WAI-ARIA: aria-sort(Property)
Description Indicates if items in a table or grid are sorted in ascending or descending order. Authors SHOULD only apply this property to table headers or grid headers. If the property is not provided, there is no defined sort order. For each table or grid, authors SHOULD apply aria-sort to only one header at a…
WAI-ARIA: aria-errormessage (Property)
Description New in ARIA 1.1 Identifies the element that provides an error message for the object. See related aria-invalid and aria-describedby. The aria-errormessage attribute references another element that contains custom error message text. Authors MUST use aria-invalid in conjunction with aria-errormessage. Initially, the object is in a valid state and either has an aria-invalid set…
Short Guide on Using the ARIA-haspopup (Property)
Description Indicates the availability and type of interactive popup element, such as menu or dialog, that can be triggered by an element. A popup element usually appears as a block of content that is on top of other content. Authors MUST ensure that the role of the element that serves as the container for the…
WAI-ARIA: aria-details (Property)
Description New in ARIA 1.1Identifies the element that provides a detailed, extended description for the object. See related aria-describedby. The aria-details attribute references a single element that provides more detailed information than would normally be provided by aria-describedby. It enables assistive technologies to make users aware of the availability of an extended description as well…
WAI-ARIA: aria-readonly (Property)
Description Indicates that the element is not editable, but is otherwise operable. See related aria-disabled. This means the user can read but not set the value of the widget. Readonly elements are relevant to the user, and application authors SHOULD NOT restrict navigation to the element or its focusable descendants. Other actions such as copying…
WAI-ARIA: aria-owns (Property)
Description Identifies an element (or elements) in order to define a visual, functional, or contextual parent/child relationship between DOM elements where the DOM hierarchy cannot be used to represent the relationship. See related aria-controls. The value of the aria-owns attribute is a space-separated list of IDREFS that reference one or more elements in the document…