Accessibility fixes / SR testing

As promised/threatened a while ago, took this through its paces in various combinations of OS/browser/AT and made some tweaks. (and cheekily added myself to the FAQ...feel free to remove the "hat tip" if you're not keen on it ;) )
Go ahead and put yourself right up front if you like. Something like:

> Initial testing done by [@patrick_h_lauke](#) with...

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