cssgrid/CSSGridLine A string type that represents one or two grid lines. Used to define the position and size of a single grid item. Valid values: <ul> <li>auto</li> <li>inherit</li> <li>1</li> <li>span 2</li> <li>span 2 / 5</li> <li>span 2 / -5</li> <li>5 / 7</li> <li>7 / span 5</li> <li>span 7 / span 5</li> </ul> 1.60.0 auto|inherit|((span)?(\s)?-?[0-9]+(\s/\s(span)?(\s)?-?[0-9]*)?)?