Tests that negative calc() values are properly clamped when needed. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS testDiv.style['width'] is "" testDiv.style['width'] = '100px' testDiv.style['width'] = 'calc(5px - 10px)' PASS testDiv.style['width'] is "calc(-5px)" PASS window.getComputedStyle(testDiv).getPropertyValue('width') is "0px" testDiv.style['width'] = '100px' testDiv.style['width'] = 'calc(10% - 100px)' PASS testDiv.style['width'] is "calc(10% - 100px)" PASS window.getComputedStyle(testDiv).getPropertyValue('width') is "0px" testDiv.style['line-height'] = '10%' testDiv.style['line-height'] = 'calc(10% - 20%)' PASS testDiv.style['line-height'] is "calc(-10%)" PASS window.getComputedStyle(testDiv).getPropertyValue('line-height') is "0px" testPre.style['tab-size'] = '8' testPre.style['tab-size'] = 'calc(2 - 4)' PASS testPre.style['tab-size'] is "calc(-2)" PASS window.getComputedStyle(testPre).getPropertyValue('tab-size') is "0" PASS successfullyParsed is true TEST COMPLETE