OSC 111 Reset Text Background Color

OSC 111 ST puts the color of the default background, behind text with no SGR background color, OSC 11, back as the terminal started it, undoing any change made with OSC 11 ; Pt ST. xterm resets it to the value it started with (ResetColorsRequest).

It takes no parameter. xterm ignores an OSC 111 that carries anything after the number, OSC 111 ; 1 ST say, as a malformed sequence (do_osc); an empty one, OSC 111 ; ST, is the same as none.

libghostty-vt has it, and agrees with xterm.

Validation

OSC111-1: After a change

\e]11;red\a
\e]111\a
\e]11;?\a

|____|
reply \e]11;rgb:ffff/ffff/ffff\a