Parser testcases================ Format------ #data<css source data>#errors<list of expected errors, with line/col offsets> (ignored at present)#expected<cssom tree, as below>#reset Format of cssom tree--------------------   line        ::= rule | declaration  rule        ::= '| ' name  name        ::= .+  declaration ::= '|  ' property-name ': ' property-value Example------- #data* { color: #ff0000; background-image: url("foo.png"); }#errors#expected| *|  color: #ff000000|  background-image: url("foo.png")#reset TODO----   + Permit nesting of rules (for nested block support)