I think it does pretty well in a screen reader (though, I have not actually asked anyone to test this).
If you have access to a Mac, VoiceOver is built-in and supposed to be a pretty good screen reader, though it's not as popular as the expensive ones.
If you want to check for ARIA correctness, there are plugins for Chrome and Firefox that will check your pages and show you things you did right, and things you did wrong.
Some are better than others, however. And all the ones I've seen give false positives to perfectly valid conventions. But it's better than not knowing if you're making progress.
If you have access to a Mac, VoiceOver is built-in and supposed to be a pretty good screen reader, though it's not as popular as the expensive ones.
If you want to check for ARIA correctness, there are plugins for Chrome and Firefox that will check your pages and show you things you did right, and things you did wrong.
Some are better than others, however. And all the ones I've seen give false positives to perfectly valid conventions. But it's better than not knowing if you're making progress.