This is definitely true, and only a small subset of accessibility failings can be caught with automated tools at all. It's certainly not a cure-all (it's not intended to be), but I love how Cypress + Testing Library helps us validate some core user flows.
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Accessibility means making your website usable for as many users as possible.
Some developers might think that this only refers to users with disabilities, but that's not true.
Cross-browser testing is an important part of an Accessibility checklist, at least in the European Union.
Before choosing an automated testing tool, I recommend that each team check their analytics to see what browsers their users are using.
You cannot run tests on Safari with Cypress.
And 20% of users worldwide are using Safari as their main browser (I'm actually one of them).
To raise awarness, we even wrote an article:
What Happens When You Don't Test On Safari
This is definitely true, and only a small subset of accessibility failings can be caught with automated tools at all. It's certainly not a cure-all (it's not intended to be), but I love how Cypress + Testing Library helps us validate some core user flows.