Canonicalize a hex color string to lowercase #rrggbb or #rrggbbaa.
#rrggbb
#rrggbbaa
Accepts: #rgb, #rgba, #rrggbb, #rrggbbaa, with or without the leading #, any case. Throws on other inputs.
#rgb
#rgba
#
Canonicalize a hex color string to lowercase
#rrggbbor#rrggbbaa.Accepts:
#rgb,#rgba,#rrggbb,#rrggbbaa, with or without the leading#, any case. Throws on other inputs.