GridSpan A string type that represents the span values of the <code>Grid</code> for large, medium and small screens. Allowed values are separated by space Letters L, M or S followed by number of columns from 1 to 12 that the container has to take, for example: <code>L2 M4 S6</code>, <code>M12</code>, <code>s10</code> or <code>l4 m4</code>. <b>Note:</b> The parameters must be provided in the order <large medium small>. ([Xx][Ll](?:[1-9]|1[0-2]))? ?([Ll](?:[1-9]|1[0-2]))? ?([Mm](?:[1-9]|1[0-2]))? ?([Ss](?:[1-9]|1[0-2]))?