XmCreateContainer(3) on Linux
The text 9399f8c4f32d, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
The Container widget creation function "XmCreateContainer" "creation functions" "XmCreateContainer"