:-moz-only-whitespace pseudo-class to do what :empty used to do (so we can use it in quirk.css and the like). Bug 157395, patch by Justin Wood <116057@bacon.qcc.mass.edu>, r+sr=bzbarsky git-svn-id: svn://10.0.0.236/trunk@166188 18797224-902f-48f8-a5cc-f745e15eee43