For more information about the web-safe palette's lack of "safeness" under the 15- and 16-bit color modes, access an article in WebMonkey online, written by David Lehn and Hadley Stern: http://hotwired.lycos.com/webmonkey/00/37/index2a.html.
If you use a color outside of the web-safe palette and your page is viewed on a computer running 256 colors or less, your color will be changed to one that is within the available system palette. So, if you want to guarantee that a particular color is going to remain constant under the largest number of situations, it's best to use a web-safe color.
On the other hand, if you use a color outside the web-safe palette and your page is viewed on a computer running 24-bit color, you don't have to worry because systems running in 24-bit color mode can handle millions of colors.
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