LayoutTests/fast/backgrounds/repeat/resources/background-repeat-shorthand.css

#icon1 {
    background-image: url(gradient.gif);
    background-repeat: no-repeat;
    background-position: 10px 20px;
    -webkit-mask-repeat: repeat;
    -webkit-mask-position: 0% 0%;
}

#icon2 {
    background-image: url(gradient.gif);
    background-repeat-x: no-repeat;
    background-position-x: 10px;
    -webkit-mask-repeat-x: repeat;
    -webkit-mask-position-x: 0% 0%;
}