Test for invalid input of webkitLineDash and webkitLineDashOffset On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS trySettingLineDash([1, 2, 3]) is [1, 2, 3] PASS trySettingLineDash([1, -1]) is [1.5, 2.5] PASS trySettingLineDash([1, Infinity]) is [1.5, 2.5] PASS trySettingLineDash([1, -Infinity]) is [1.5, 2.5] PASS trySettingLineDash([1, NaN]) is [1.5, 2.5] PASS trySettingLineDash([1, 'string']) is [1.5, 2.5] PASS trySettingLineDashOffset(0.5) is 0.5 PASS trySettingLineDashOffset(-0.5) is -0.5 PASS trySettingLineDashOffset(Infinity) is 1.5 PASS trySettingLineDashOffset(-Infinity) is 1.5 PASS trySettingLineDashOffset(NaN) is 1.5 PASS trySettingLineDashOffset('string') is 1.5 PASS successfullyParsed is true TEST COMPLETE