Tes cases for properties 20 to 2f.
Tes cases for properties 20 to 2f.

svn path=/trunk/libcss/; revision=6113

prepare/netsurf_libcss,servo/libcss,servo/libcss,servo/libcss,zhuyadong/libcss,prepare/netsurf_libcss,zhuyadong/libcss,zhuyadong/libcss,prepare/netsurf_libcss