Test window.CSS.escape() On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS CSS.escape('\0') is "�" PASS CSS.escape('a\0') is "a�" PASS CSS.escape('\0b') is "�b" PASS CSS.escape('a\0b') is "a�b" PASS CSS.escape('�') is "�" PASS CSS.escape('a�') is "a�" PASS CSS.escape('�b') is "�b" PASS CSS.escape('a�b') is "a�b" PASS CSS.escape() threw exception TypeError: Failed to execute 'escape' on 'CSS': 1 argument required, but only 0 present.. PASS CSS.escape(true) is "true" PASS CSS.escape(false) is "false" PASS CSS.escape(null) is "null" PASS CSS.escape('') is "" PASS CSS.escape('') is "\\1 \\2 \\1e \\1f " PASS CSS.escape('0a') is "\\30 a" PASS CSS.escape('1a') is "\\31 a" PASS CSS.escape('2a') is "\\32 a" PASS CSS.escape('3a') is "\\33 a" PASS CSS.escape('4a') is "\\34 a" PASS CSS.escape('5a') is "\\35 a" PASS CSS.escape('6a') is "\\36 a" PASS CSS.escape('7a') is "\\37 a" PASS CSS.escape('8a') is "\\38 a" PASS CSS.escape('9a') is "\\39 a" PASS CSS.escape('a0b') is "a0b" PASS CSS.escape('a1b') is "a1b" PASS CSS.escape('a2b') is "a2b" PASS CSS.escape('a3b') is "a3b" PASS CSS.escape('a4b') is "a4b" PASS CSS.escape('a5b') is "a5b" PASS CSS.escape('a6b') is "a6b" PASS CSS.escape('a7b') is "a7b" PASS CSS.escape('a8b') is "a8b" PASS CSS.escape('a9b') is "a9b" PASS CSS.escape('-0a') is "-\\30 a" PASS CSS.escape('-1a') is "-\\31 a" PASS CSS.escape('-2a') is "-\\32 a" PASS CSS.escape('-3a') is "-\\33 a" PASS CSS.escape('-4a') is "-\\34 a" PASS CSS.escape('-5a') is "-\\35 a" PASS CSS.escape('-6a') is "-\\36 a" PASS CSS.escape('-7a') is "-\\37 a" PASS CSS.escape('-8a') is "-\\38 a" PASS CSS.escape('-9a') is "-\\39 a" PASS CSS.escape('-') is "\\-" PASS CSS.escape('-a') is "-a" PASS CSS.escape('--') is "--" PASS CSS.escape('--a') is "--a" PASS CSS.escape('€-_©') is "€-_©" PASS CSS.escape('€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ') is "\\7f €‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ" PASS CSS.escape(' ¡¢') is " ¡¢" PASS CSS.escape('a0123456789b') is "a0123456789b" PASS CSS.escape('abcdefghijklmnopqrstuvwxyz') is "abcdefghijklmnopqrstuvwxyz" PASS CSS.escape('ABCDEFGHIJKLMNOPQRSTUVWXYZ') is "ABCDEFGHIJKLMNOPQRSTUVWXYZ" PASS CSS.escape(' !xy') is "\\ \\!xy" PASS CSS.escape('𝌆') is "𝌆" PASS CSS.escape('') === '' is true PASS CSS.escape('') === '' is true PASS successfullyParsed is true TEST COMPLETE