The Anchor Positioning spec introduces some automatic behavior for normal alignment in response to position-area. It defaults items to "smart" overflow alignment, trying to stay within the containing block. For any individual alignment value, the overflow alignment type can be overridden with safe or unsafe, but we don't currently have a way to tweak the automatic alignment to control its overflow safety without specifying an explicit alignment. Should we add a syntax for this? If so, would adding just an overflow alignment keyword by itself be sufficient?