Draw once.
Tile on both axes, the CSS default. The last tile is cut off wherever the box ends.
Tile across only, one row.
Tile down only, one column.
Tile whole copies only, stretching each one so they fill the box exactly.
Tile whole copies only, spreading the leftover space evenly between them.
How a background image tiles to fill the box it is painted into.
CSS
background-repeat, which tiles unless told otherwise.