Screen Reader Text in output of comments_popup_link

As of WordPress 4.2, the output of comments_popup_link now uses .screen-reader-text in themes using the default strings in calls to comments_popup_link. The accessibility team has put together a post on hiding text for screen readers that includes sample code to use in your themes.

I recommended that all themes include the .screen-reader-text class. This change was announced by the on the theme team blog in January. In the future, there may be more changes to output that relies upon the presence of the .screen-reader-text class.

Related Ticket:
#26553

#4-2, #dev-notes