PASS document.styleSheets[1].rules[0].style.cssText is "-webkit-mask-repeat-x: repeat; -webkit-mask-repeat-y: no-repeat;"
PASS document.styleSheets[1].rules[0].style.getPropertyValue('-webkit-mask') is ""
PASS document.styleSheets[1].rules[0].style.getPropertyValue('-webkit-mask-repeat') is "repeat-x"