Completed action item to update issue #173

I had an action item to update the proposed failure technique for regions
of a page, addressing concerns on the call.

I think I have done that, and ensured that the sections do not contain
trivial content that would not be necessary to distinguish. I did this by
updating the text of the failure and adding to the Understanding:

"An exception would when the content is not really a region (a group of
cohesive content). For instance, a footer with only a copyright notice, or
a header with only a logo are not really regions because neither of these
examples would be a group of content."

https://github.com/w3c/wcag/issues/173

David MacDonald



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