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 element (or elements) that describes the object. See related aria-labelledby. The aria-labelledby attribute is similar to the aria-describedby in that both reference other elements to calculate a text alternative, but a label should be concise, where a description is intended to provide more verbose information. The element or elements referenced by the…
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 Defines an element’s row index or position with respect to the total number of rows within a table, grid, or treegrid. See related aria-rowcount and aria-rowspan. If all of the rows are present in the DOM, it is not necessary to set this attribute as the user agent can automatically calculate the index of…
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 Indicates what notifications the user agent will trigger when the accessibility tree within a live region is modified. See related aria-atomic. The attribute is represented as a space delimited list of the following values: additions, removals, text; or a single catch-all value all. This is used to describe semantically meaningful changes, as opposed to…
Description Indicates that the user may select more than one item from the current selectable descendants. Authors SHOULD ensure that selected descendants have the aria-selected attribute set to true, and selectable descendant have the aria-selected attribute set to false. Authors SHOULD NOT use the aria-selected attribute on descendants that are not selectable. Note: Lists and trees…