Test parsing of CSS escapes.

TEST DID NOT COMPLETE

Rules from the stylesheet:

Expected result:

#a::after { content: '65:A 9:\9'; }
#b::after { content: '128:€ 159:Ÿ'; }
#c::after { content: '1:\1'; }
#d::after { content: '8:\8'; }
#e::after { content: '9:\9'; }
#f::after { }
#g::after { content: '11:\b'; }
#h::after { }
#i::after { }
#j::after { content: '14:\e'; }
#k::after { content: '20:\14'; }
#l::after { content: '30:\1e'; }
#m::after { content: '31:\1f'; }
#n::after { content: '127:\7f'; }
#o::after { content: '384:ƀ'; }