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Blazor Slider Accessibility

Out of the box, the Telerik UI for Blazor 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 AA 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

SelectorAttributeUsage
.k-draghandlerole=sliderSets the proper role for Slider.
aria-label or aria-labelledby or titleThe Slider needs an accessible name to be assigned to it.
aria-valuetextSpecifies the text that would be announced based on the currently selected value in the Slider.
aria-readonly=trueAttribute is rendered only when the Slider is readonly.
aria-invalid=trueAttribute is rendered only when the Slider is in form and announces the valid state of the component.
tabindex=0The element must be focusable.
.k-draghandle:not(.k-hsv-draghandle)aria-valuenowSpecifies the currently selected value in the Slider.
aria-valueminSpecifies the minimum available value in the Slider.
aria-valuemaxSpecifies the maximum available value in the Slider.
.k-slider-vertical .k-draghandlearia-orientation=verticalPresent only when slider is vertical.
.k-disabled .k-draghandlearia-disabled=trueAttribute is rendered only when the Slider is disabled.

Note that using an <a> element for role="slider" is not allowed.

Slider Buttons

SelectorAttributeUsage
.k-slider .k-button-decrease, .k-slider .k-button-increasearia-hidden=trueHides the decrease/increase button elements and all their children from assistive technologies.
tabindex=-1Excludes the decorative decrease/increase buttons from the natural tab order of the page.

Resources

WAI-ARIA specification for slider

Section 508

The Slider is fully compliant with the Section 508 requirements.

Testing

The Slider has been extensively tested automatically with axe-core and manually with the most popular screen readers.

To report any accessibility issues, contact the team through the Telerik Support System.

Screen Readers

The Slider has been tested with the following screen readers and browsers combinations:

EnvironmentTool
FirefoxNVDA
ChromeJAWS
Microsoft EdgeJAWS

Keyboard Navigation

For details on how the Slider keyboard navigation works, refer to the Blazor Slider Accessibility and Keyboard Navigation Demo.

See Also