For any vertices in the selection that have only some associated face corners selected, the selection is expanded to include all face corners associated with that vertex. Modifying vertex attributes after applying this operation will cause assigned values to smoothly interpolate across affected faces.

When [link]Inclusive Mode[/link] is active, newly selected faces and edges will automatically expand in this same way. With Inclusive Mode off (as it is by default), only the face corners directly involved in the faces and edges being selected will be added to the selection.