Tests using calculated value in function() for 'grid-template-rows' CSS property works. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS testDiv.style['grid-template-rows'] is "" testDiv.style['grid-template-rows'] = 'repeat(calc(1 + 1), 18px)' PASS testDiv.style['grid-template-rows'] is "repeat(2, 18px)" PASS window.getComputedStyle(testDiv).getPropertyValue('grid-template-rows') is "18px 18px" PASS successfullyParsed is true TEST COMPLETE