`blink` and `reverse`. The first color given is the foreground; the
second is the background. The position of the attribute, if any,
doesn't matter.
++
+Colors (foreground and background) may also be given as numbers between
+0 and 255; these use ANSI 256-color mode (but note that not all
+terminals may support this).
color.diff::
Whether to use ANSI escape sequences to add color to patches.