OSC 116 Reset Tektronix Background Color

OSC 116 ST puts the color of the background of xterm’s Tektronix 4014 window, OSC 16, back as the terminal started it, undoing any change made with OSC 16 ; Pt ST. xterm resets it to the value it started with (ResetColorsRequest).

It takes no parameter. xterm ignores an OSC 116 that carries anything after the number, OSC 116 ; 1 ST say, as a malformed sequence (do_osc); an empty one, OSC 116 ; ST, is the same as none.

libghostty-vt has no such color, and ignores OSC 16 and OSC 116, so the case that asks is a known difference.

Validation

OSC116-1: After a change

\e]16;red\a
\e]116\a
\e]16;?\a

|____|
reply \e]16;rgb:ffff/ffff/ffff\a