The Kendo UI for Angular DropDownButton component is WCAG 2.1 AAA and Section 508 compliant. The component also follows the WAI-ARIA best practices for implementing the keyboard navigation for its component role, and is tested against the popular screen readers.
All relevant internal elements of the ButtonGroup component have the aria attributes and roles with their respective values, required for WCAG 2.1 compliance.
The DropDownButton is compliant with the Section 508 requirements.
The tool used for Automated Testing is Axe Core.
Any Accessibility Issues could be reported in the Telerik Support System.