Test the parsing of box-shadow. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". Negative blur radius value : 10px 10px -1px rgb(255, 0, 0) PASS cssRule.type is 1 PASS declaration.length is 0 PASS declaration.getPropertyValue('box-shadow') is "" Negative blur radius value, with a spread defined : 10px 10px -1px 10px rgb(255, 0, 0) PASS cssRule.type is 1 PASS declaration.length is 0 PASS declaration.getPropertyValue('box-shadow') is "" Negative blur radius value, with a negative spread defined : 10px 10px -1px -1px rgb(255, 0, 0) PASS cssRule.type is 1 PASS declaration.length is 0 PASS declaration.getPropertyValue('box-shadow') is "" Extraneous commas at beginning : ,,,,,10px 10px rgb(255, 0, 0) PASS cssRule.type is 1 PASS declaration.length is 0 PASS declaration.getPropertyValue('box-shadow') is "" Extraneous commas at end : 10px 10px rgb(255, 0, 0),,,,, PASS cssRule.type is 1 PASS declaration.length is 0 PASS declaration.getPropertyValue('box-shadow') is "" PASS successfullyParsed is true TEST COMPLETE