aria-valuetext
Widget attributes might be mapped by a user agent to platform accessibility API state, for access by assistive technologies, or they might be accessed directly from the DOM. User agents MUST provide a way for assistive technologies to be notified when states change, either through DOM attribute change events or platform accessibility API events.
Defines the human readable text alternative of aria-valuenow for a range widget.
This property is used, for example, on a range widget such as a slider or progress bar.
If the aria-valuetext attribute is set, authors SHOULD also set the aria-valuenow attribute, unless that value is unknown (for example, on an indeterminate progressbar).
Authors SHOULD only set the aria-valuetext attribute when the rendered value cannot be meaningfully represented as a number. For example, a slider may have rendered values of small, medium, and large. In this case, the values of aria-valuenow could range from 1 through 3, which indicate the position of each value in the value space, but the aria-valuetext would be one of the strings: small, medium, or large. If the aria-valuetext attribute is absent, the assistive technologies will rely solely on the aria-valuenow attribute for the current value.
If aria-valuetext is specified, assistive technologies SHOULD render that value instead of the value of aria-valuenow.