Tag Attribute : Colours
HTML colours described in hex RGB (Red Green Blue) components
#RRGGBB .... 256x256x256 = 16 Millions colours
?
#ffff00 : yellow
table of "web safe" colours (216 = 6x6x6 colour cube : 00 33 66 99 CC FF)
Colour Blindness
When using colour, remember that 5 to 10% of men have some form of colour
blindness. This can cause difficulties distinguishing between red and green,
or between yellow and blue.
To know more about that
subject : http://www.lynda.com/hex.html
and http://www.permadi.com/tutorial/websafecolor/