To be honest my experience with Storybook is limited, and I see it more specialized for design-system consistency and review. Karate is a generic browser automation framework, which can do cross-browser testing. With some tweaks it could possibly complement Storybook, for instance, here is an example of an accessibility test-report: https://twitter.com/getkarate/status/1338892932691070976

Thanks for the pointer, we will certainly explore the possibilities here!