Content on Hover or Focus

Hi everyone,

I've attempted to resolve all open issues and discussion regarding Content on Hover or Focus, and I'm proposing the following changes to the SC:

1.       Revision to Hoverable condition to use more plain language (issues #695 and #711)

2.       Revised initial sentence to scope to additional content which also disappears on hover or focus.  This is needed to scope out content that may appear on focus such as in a tab list, drop down box, etc. (issue #650)

3.       Adds an exception to the Dismissable condition when the additional content doesn't obscure or replace anything.  This addresses comments on mailing list regarding things like help content inserted inline when an input field has focus.

Please review the changes here: http://rawgit.com/w3c/wcag21/hover-focus-edits/guidelines/#content-on-hover-or-focus

Comment here or on the pull request at https://github.com/w3c/wcag21/pull/739

Thanks!

Steve Repsher
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