[motion] Note about closest-side seems wrong

[fantasai]

Note: When the initial position is at one of the corners of the containing block, the closest side takes the edge that the initial position is on. Even if the offset given by <length> or <percentage> changes, the position of the element specified with closest-side is the same.

This seems wrong. If the initial position is at the corner and closest-side is specified, then a percentage offset-distance will be zero, because the path is zero-length. But since it is defined as an unbounded ray, a distance should move in the specified direction.