Test the disabled property on a style element. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS styleElement.disabled is false PASS window.getComputedStyle(testElement).color is "rgb(0, 128, 0)" PASS styleElement.disabled is true PASS window.getComputedStyle(testElement).color is "rgb(255, 0, 0)" PASS styleElement.sheet.disabled is true PASS styleElement.sheet.disabled is false PASS styleElement.disabled is false PASS window.getComputedStyle(testElement).color is "rgb(0, 128, 0)" PASS newStyleElement.disabled is false PASS newStyleElement.disabled is false PASS otherStyle.disabled is false PASS otherStyle.disabled is false PASS successfullyParsed is true TEST COMPLETE