CSS: Update .ui-helper-hidden-accessible to match H5BP's current .visuallyhidden. Fixes #8793 - Dialog: Internal autocomplete causes scroll bars.
CSS: Update .ui-helper-hidden-accessible to match H5BP's current .visuallyhidden. Fixes #8793 - Dialog: Internal autocomplete causes scroll bars.

GrayYoung/jQuery.UI.Extension,GrayYoung/jQuery.UI.Extension