Accessibility testing is way more convenient than most think. Here's a short video that shows how to do it (Mac & Safari, looking at BTCPay invoice screen) and some common issues.
https://www.youtube.com/watch?v=PjN-XXgcJKo
Same if you want to test on your phone.
https://www.youtube.com/watch?v=n9FvI5SfpoU
More info and videos on the accessibility page in the Bitcoin Design Guide.
https://bitcoin.design/guide/designing-products/accessibility/
Join us for Accessibility Awareness Day on May 18.