Well, three strikes and you're out. The accessibility checker commonly referred to as Cynthia, I discovered, also caused my site to return the beguiling Server Error 500 message.
The Switch to application/xhtml+xml was an interesting experiment but enough is enough. IIS is just not liking some of the browser interactions so until I figure out what is going on with these Server 500 errors, I'm falling back to html/text.
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