ProgressBar Accessibility
When used as a loading indicator, the ProgressBar and its status can also be made available to assistive technologies.
WAI-ARIA
When used as a loading indicator, the component should follow the WAI-ARIA specification for a progressbar. According to that, the progressbar is "An element that displays the progress status for tasks that take a long time.". To guarantee compliance with the spec, the ariaRole configuration option should be set to true and a label should be provided using either the label or the labelId options.
Section 508
The ProgressBar is compliant with the Section 508 requirements. For more information, refer to the article on Section 508 support in Kendo UI for jQuery.
WCAG 2.1
The ProgressBar supports the standards for providing accessible web content which are set by the Web Content Accessibility Guidelines 2.1. For more information, refer to the article on WCAG 2.1 compliance in Kendo UI for jQuery