New to Telerik UI for ASP.NET CoreStart a free 30-day trial

Captcha Accessibility

Out of the box, the Telerik UI for ASP.NET Core Captcha provides extensive accessibility support and enables users with disabilities to acquire complete control over its features.

The Captcha 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.

No role attribute is implemented as the html input type="text" element is sufficient for definining purpose of the component.

SelectorAttributeUsage
.k-captcha-image>imgaltThe Captcha image must have an alt tag, so that the.
.k-captcha-image-controls>.k-buttonrole=button or nodeName=buttonThe image control buttons must have an appropriate role.
aria-label or titleEach button must have an accessible name as they are all represented by icons and no text is available in their contents.
.k-captcha-input .k-input-innerrole=textbox or nodeName=inputDescribes the role of the component.
label for or aria-label or aria-labelledbyThe input needs an accessible name to be assigned to it.
aria-invalid=trueAttribute is rendered only when the captcha is in form and announces the valid state of the component.
.k-disabled .k-input-innerdisabled=disabled or aria-disabled=trueAttribute is rendered only when the textbox is disabled.
.k-captcha-input>inputtype=hiddenThe hidden input holding the Captcha ID value so that the remote could validate the user input.

Resources

WAI-ARIA specification for textbox

Section 508

The Captcha is fully compliant with the Section 508 requirements.

Testing

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

EnvironmentTool
FirefoxNVDA
ChromeJAWS
Microsoft EdgeJAWS

Test Example

To test the Captcha component, refer to the Captcha Accessibility Demo.

Keyboard Navigation

For details on how the Captcha keyboard navigation works, refer to the Captcha Keyboard Navigation article.

See Also