Some terminal emulators (urxvt, konsole) set to report the color scheme of the terminal (mainly light vs. dark background). This behavior originated in S-Lang and is used by vim. Gnome-terminal refuses to add this behavior, as the syntax for the value is not agreed upon, the value cannot be changed upon a runtime change of the palette, and more "proper" xterm OSC 4/10/11 sequences already exist.
Some terminal emulators (urxvt, konsole) set to report the color scheme of the terminal (mainly light vs. dark background). This behavior originated in S-Lang and is used by vim. Gnome-terminal refuses to add this behavior, as the syntax for the value is not agreed upon, the value cannot be changed upon a runtime change of the palette, and more "proper" xterm OSC 4/10/11 sequences alrea!dy exist.