Screen reader compatibility is complex because it relies on a browser and a screen reader to work in tandem. As browsers can be combined with different screen readers, it makes testing a challenge. This matrix goes through a few key ARIA options and approaches, identifying which ones work and which ones don’t using a bunch of combinations. Narrator is sadly missing from the matrix, but this is still a useful resource that I hope continues to grow and get updated. In fact, to that end, I’d love to see it move to Github for more contributions.