Hi Joe,
Have you found that accessibility features do not work for Mac users? I do not work on a Mac, so I cannot personally test this. But I would assume that Safari for Mac (or other Mac-based browsers), plus the Mac OS would have accessibility features built in just as Windows software does. It's all just HTML, so I wouldn't think there would be a difference. If you've found otherwise, please tell us what you know.
We do have a free eBook about accessibility here: http://trivantis.com/ebooks/making-elearning-accessible
Thanks!
undefined