Fix typo in CSS validator
Fix typo in CSS validator

Kozea/WeasyPrint,Kozea/WeasyPrint,marclaporte/WeasyPrint,marclaporte/WeasyPrint,prepare/TestWeasyPrint,andrewleech/WeasyPrint,jasco/WeasyPrint,jasco/WeasyPrint,andrewleech/WeasyPrint,prepare/TestWeasyPrint