Fix #13894: CSS identifiers with backslash-escaped whitespace (cherry picked from commit a75016634d439179fa6517da1918a5a667886e99)
Fix #13894: CSS identifiers with backslash-escaped whitespace
(cherry picked from commit a75016634d439179fa6517da1918a5a667886e99)

Karyotyper/jquery,Karyotyper/jquery,eburgos/jquery,eburgos/jquery,roytoo/jquery,Karyotyper/jquery,jcutrell/jquery,quiaro/request-agent,roytoo/jquery,chitranshi/jquery,eburgos/jquery,jcutrell/jquery,rwaldron/jquery,roytoo/jquery,rwaldron/jquery,jquery/jquery,jquery/jquery,chitranshi/jquery,jquery/jquery