.test1 {
    background: url("/icons/icon-left.png") 0 100%; 
}

.test2 {
    background-image: url("/icons/icon-left.png");
    background-position: 0 100%;
}

.test3 {
    background-image: url("/icons/icon-left.png");
    background-position-x: 0;
    background-position-y: 100%;
}

.test4 {
    object-position: 0 100%;
}

/* inside a nested rule */
.test1 {
    &.test2 {
        background: url("/icons/icon-left.png") 0 100%;
    }
    .test3 {
        background-image: url("/icons/icon-left.png");
        background-position: 0 100%;
    }
    
    > .test4 {
        background-image: url("/icons/icon-left.png");
        background-position-x: 0;
        background-position-y: 100%;
    }
    
    + .test5 {
        object-position: 0 100%;
    }
}

/* inside a keyframe animation */
@keyframes flip1 {
    from {
        background: url("/icons/icon-left.png") 0 100%;
    }
    to {
        background: url("/icons/icon-left.png") 100% 100%;
    }
}

@keyframes flip2 {
    from {
        background-image: url("/icons/icon-left.png");
        background-position: 0 100%;
    }
    to {
        background-image: url("/icons/icon-left.png");
        background-position: 100% 100%;
    }
}

@keyframes flip3 {
    from {
        background-image: url("/icons/icon-left.png");
        background-position-x: 0;
        background-position-y: 100%;
    }
    to {
        background-image: url("/icons/icon-left.png");
        background-position-x: 100%;
        background-position-y: 100%;
    }
}

@keyframes flip4 {
    from {
        object-position: 0 100%;
    }
    to {
        object-position: 100% 100%;
    }
}

/* inside a media-query */
@media screen and (max-width: 800px) {
    .test1 {
        background: url("/icons/icon-left.png") 0 100%;
    }

    .test2 {
        background-image: url("/icons/icon-left.png");
        background-position: 0 100%;
    }

    .test3 {
        background-image: url("/icons/icon-left.png");
        background-position-x: 0;
        background-position-y: 100%;
    }

    .test4 {
        object-position: 0 100%;
    }
}