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
Chrome
Edge
Firefox
Internet Explorer
Opera
Safari
WebView Android
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
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.
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.
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Description Identifies the next element (or elements) in an alternate reading order of content which, at the user’s discretion, allows assistive technology to override the general default of reading in document source order. When aria-flowto has a single IDREF, it allows assistive technologies to, at the user’s request, forego normal document reading order and go…
Description Defines a string value that labels the current element. See related aria-labelledby. The purpose of aria-label is the same as that of aria-labelledby. It provides the user with a recognizable name of the object. The most common accessibility API mapping for a label is the accessible name property. If the label text is visible…
Description Defines the total number of columns in a table, grid, or treegrid. See related aria-colindex. If all of the columns are present in the DOM, it is not necessary to set this attribute as the user agent can automatically calculate the total number of columns. However, if only a portion of the columns is…
Description Indicates that an element will be updated, and describes the types of updates the user agents, assistive technologies, and user can expect from the live region. The values of this attribute are expressed in degrees of importance. When regions are specified as polite, assistive technologies will notify users of updates but generally do not…
Description Defines an element’s column index or position with respect to the total number of columns within a table, grid, or treegrid. See related aria-colcount and aria-colspan. If all of the columns are present in the DOM, it is not necessary to set this attribute as the user agent can automatically calculate the column index…
Description Identifies the element (or elements) that labels the current element. See related aria-describedby. The purpose of aria-labelledby is the same as that of aria-label. It provides the user with a recognizable name of the object. The most common accessibility API mapping for a label is the accessible name property. If the interface is such…