Computes to ‘50%’ (‘left 50%’) for the horizontal position if the horizontal position is not otherwise specified, or ‘50%’ (‘top 50%’) for the vertical position if it is.
Computes to ‘0%’ for the horizontal position if one or two values are given, otherwise specifies the left edge as the origin for the next offset.
Computes to ‘100%’ for the horizontal position if one or two values are given, otherwise specifies the right edge as the origin for the next offset.
Computes to ‘0%’ for the vertical position if one or two values are given, otherwise specifies the top edge as the origin for the next offset.
Computes to ‘100%’ for the vertical position if one or two values are given, otherwise specifies the bottom edge as the origin for the next offset.