/* CALC EXPRESSIONS */
/* FIXME: negative numbers can be improved */
div {
    width: -webkit-calc(100% + 80px + 1em);
}

div {
    width: -webkit-calc(100% / 6);
}

div {
    width: -webkit-calc(10% * 6);
}

div {
    width: calc(-960px + 75%);
}

div {
    width: calc(100vw-50vw);
}