Utilize a more widely-adopted CSS method for hiding screen reader text, as seen in projects like jQuery UI and HTML5 Boilerplate. props codebykat for the initial patch. fixes #23684, #26107.


git-svn-id: https://develop.svn.wordpress.org/trunk@26602 602fd350-edb4-49c9-b593-d223f7449a82
Svg-painter: fix couple of jshint warnings, see #26333.

git-svn-id: https://develop.svn.wordpress.org/trunk@26603 602fd350-edb4-49c9-b593-d223f7449a82