This line should be green.
(...) inside a
string, a backslash followed by a newline is ignored (i.e., the string is
deemed not to contain either the backslash or the newline).
coming from CSS 2.1, section 4.1.3 Characters and case
Firefox 3.0.3, NS 7.2, Seamonkey 1.x, Seamonkey 2.x, K-meleon 1.x, Galeon 2.0.7, Epiphany 2.22.3 all pass this test.