OSC 110 Reset Text Foreground Color

OSC 110 ST puts the color of the default foreground, used by text with no SGR color, OSC 10, back as the terminal started it, undoing any change made with OSC 10 ; Pt ST. xterm resets it to the value it started with (ResetColorsRequest).

It takes no parameter. xterm ignores an OSC 110 that carries anything after the number, OSC 110 ; 1 ST say, as a malformed sequence (do_osc); an empty one, OSC 110 ; ST, is the same as none.

Each reset handles one color. There is no reset for all ten together, as there is for the palette with OSC 104.

libghostty-vt has it, and agrees with xterm.

Validation

OSC110-1: After a change

\e]10;red\a
\e]110\a
\e]10;?\a

|____|
reply \e]10;rgb:0000/0000/0000\a

OSC110-2: Only that color

\e]10;red;blue\a
\e]110\a
\e]10;?;?\a

|____|
reply \e]10;rgb:0000/0000/0000\a\e]11;rgb:0000/0000/ffff\a

OSC110-3: A parameter makes it malformed

\e]10;red\a
\e]110;1\a  # ignored
\e]10;?\a

|____|
reply \e]10;rgb:ffff/0000/0000\a

OSC110-4: An empty one is no parameter

\e]10;red\a
\e]110;\a
\e]10;?\a

|____|
reply \e]10;rgb:0000/0000/0000\a