I'm guessing it may have been one or both of these `xterm`-related documents: * <https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h4-Functions-using-CSI

I'm guessing it may have been one or both of these `xterm`-related documents: * <https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h4-Functions-using-CSI-_-ordered-by-the-final-character-lparen-s-rparen:CSI-Ps-@.1C80 https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h4-F...> * <https://invisible-island.net/xterm/xterm.faq.html#color_by_number https://invisible-island.net/xterm/xterm.faq.html#color_by_n...> More details in my other comment: https://news.ycombinator.com/item?id=35157058 https://news.ycombinator.com/item?id=35157058