onBlack property
chalkdart favors 'onXXXXX' style of specifying background colors because it makes
chained methods list read better as a sentence (it's the Dart way
).
We include original Chalk 'bgXXXX' method names for users that prefer that scheme
and for legacy compatibility with original JS Chalk.
Set background base 16 xterm colors black
(terminal dependent)
Implementation
Chalk get onBlack =>
_createStyler(_ansiSGRModiferOpen(40), _ansiBgClose, this);