This site tests which newish HTML5 features are accessibly supported by major browsers. This includes if they are keyboard accessible, mapped to the platform accessibility APIs, and if any accessibility related features are supported. An accessibly supported feature means it is usable by people who rely on assistive technology, without developers having to supplement with ARIA or other additional workarounds. Read What does acessibility supported mean for a comprehensive understanding of how to interpret these findings.
Go to the preferred site: https://stevefaulkner.github.io/HTML5accessibility/