This test makes sure that the font-display descriptor in @font-face is appropriately parsed. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS sheet.rules[0].style.getPropertyValue('font-display') is "" PASS sheet.rules[1].style.getPropertyValue('font-display') is "" PASS sheet.rules[2].style.getPropertyValue('font-display') is "" PASS sheet.rules[3].style.getPropertyValue('font-display') is "auto" PASS sheet.rules[4].style.getPropertyValue('font-display') is "block" PASS sheet.rules[5].style.getPropertyValue('font-display') is "swap" PASS sheet.rules[6].style.getPropertyValue('font-display') is "fallback" PASS sheet.rules[7].style.getPropertyValue('font-display') is "optional" PASS sheet.rules[8].style.getPropertyValue('font-display') is "" PASS window.getComputedStyle(document.getElementById('test9')).getPropertyValue('font-display') is "" PASS successfullyParsed is true TEST COMPLETE