Accessibility Support
Out of the box, the Telerik and Kendo UI Slider provides extensive accessibility support and enables users with disabilities to acquire complete control over its features.
The Slider is compliant with the Web Content Accessibility Guidelines (WCAG) 2.2 standards and Section 508 requirements, follows the Web Accessibility Initiative - Accessible Rich Internet Applications (WAI-ARIA) best practices for implementing the keyboard navigation for its component role, provides options for managing its focus and is tested against the most popular screen readers.
WAI-ARIA
This section lists the selectors, attributes, and behavior patterns supported by the component and its composite elements, if any.
Slider Drag Handle
| Selector | Attribute | Usage |
|---|---|---|
.k-draghandle | role=slider | Sets the proper role for Slider. |
aria-label or aria-labelledby or title | The Slider needs an accessible name to be assigned to it. | |
aria-valuetext | Specifies the text that would be announced based on the currently selected value in the Slider. | |
aria-readonly=true | Attribute is rendered only when the Slider is readonly. | |
aria-invalid=true | Attribute is rendered only when the Slider is in form and announces the valid state of the component. | |
tabindex=0 | The element must be focusable. | |
.k-draghandle:not(.k-hsv-draghandle) | aria-valuenow | Specifies the currently selected value in the Slider. |
aria-valuemin | Specifies the minimum available value in the Slider. | |
aria-valuemax | Specifies the maximum available value in the Slider. | |
.k-slider-vertical .k-draghandle | aria-orientation=vertical | Present only when slider is vertical. |
.k-disabled .k-draghandle | aria-disabled=true | Attribute is rendered only when the Slider is disabled. |
<a>
element for
role="slider"
is not allowed.
Slider Buttons
| Selector | Attribute | Usage |
|---|---|---|
.k-slider .k-button-decrease, .k-slider .k-button-increase | aria-hidden=true | Hides the decrease/increase button elements and all their children from assistive technologies. |
tabindex=-1 | Excludes the decorative decrease/increase buttons from the natural tab order of the page. |
Keyboard Shortcuts
| Shortcut | Behavior |
|---|---|
Arrow Down or Arrow Left | Decreases value by small step. |
Arrow Up or Arrow Right | Increases value by small step. |
Home | Sets value to the Min value. |
End | Sets value to the Max value. |
Page up | Increases value by large step. |
Page down | Decreases value by large step. |
Testing
The Slider has been extensively tested automatically with axe-core and manually with the most popular screen readers.
Screen Readers
The Slider has been tested with the following screen readers and browsers combinations:
| Environment | Tool |
|---|---|
| Firefox | NVDA |
| Chrome | JAWS |
| Microsoft Edge | JAWS |
