Possible formats/colors that can be used in "<< >>"
include:
(1) bold, italic, underline, reset, blurred, inverse, hidden, strikethrough;
(2) black, white, silver, red, green, blue, yellow, cyan, magenta;
(3) bgBlack, bgWhite, bgRed, bgGreen, bgBlue, bgYellow, bgCyan, bgMagenta.
See more details in glue::glue()
and glue::glue_col()
.