16. The at least one computer-readable storage medium of claim 14 , wherein scoring each one content element of the one or more parent content elements and the first visible content element based on the criteria comprises scoring each one content element based on an evaluation of visual separation between the one content element and an adjacent content element on one or more sides.
16. The at least one computer-readable storage medium of claim 14 , wherein scoring each one content element of the one or more parent content elements and the first visible content element based on the criteria comprises scoring each one content element based on an evaluation of visual separation between the one content element and an adjacent content element on one or more sides. 17. The at least one computer-readable storage medium of claim 16 , wherein scoring each one content element based on an evaluation of visual separation between the one content element and an adjacent content element on one or more sides comprises, for a first side of a one content element that is a container for one or more child visible content elements: determining one of the child visible content element that is positioned closest to the first side of the container; and using, as the visual separation between the container and an adjacent content element on the first side, the visual separation between the child visible content element and the adjacent content element on the first side.