Returns the container Current size, in pixels, excluding the decorations, i.e. the size of the Client area, see the Layout Guide. Useful for IupFrame, IupTabs and IupDialog that have decorations. Can also be consulted in other containers, it will return the Current size. For controls that have a native representation is only available when the control is mapped.
"widthxheight", where width and height are integer values corresponding to the horizontal and vertical size, respectively, in pixels.
All elements that are containers, except menus.
For IupDialog CLIENTSIZE is NOT read-only, and it will define RASTERSIZE by adding the decorations to the Client size. (Since 3.3)
SIZE, RASTERSIZE, CLIENTOFFSET