git-svn-id: https://develop.svn.wordpress.org/trunk@21618 602fd350-edb4-49c9-b593-d223f7449a82
props drewstrojny, lancewillett. also props corvannoorloos, jeffsebring, kobenland, iandstewart, mfields, mtdesign, op12no2, philiparthurmoore, sixhours, mamaduka. see #19978. git-svn-id: https://develop.svn.wordpress.org/trunk@21261 602fd350-edb4-49c9-b593-d223f7449a82