December 2002
Intermediate to advanced
576 pages
32h
English
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Chapter 8. Color Names and Values
With the popular browsers, you can prescribe the colors of various elements of your document via tag attributes or CSS style definitions.
You may specify the color value as a six-digit hexadecimal number that represents the red, green, and blue (RGB) components of the color. The first two digits correspond to the red component of the color, the next two to the green component, and the last two to the blue component. A value of 00 corresponds to the component being completely off; a value of FF (255) corresponds to the component being completely on. Thus, bright red is FF0000, bright green is 00FF00, and bright blue is 0000FF. Other primary colors are mixtures of two components, such as yellow (FFFF00), magenta (FF00FF), and cyan (00FFFF). White (FFFFFF) and black (000000) are also easy to figure out.
You use these values in a tag by replacing the color with the RGB
triple, preceded by a hash (#) symbol. To make all
visited links display as magenta, use this body tag:
<body vlink="#FF00FF" >
Determining the hexadecimal value for more esoteric colors like “papaya whip” or “navajo white” is very difficult. You can go crazy trying to adjust the RGB triple for a color to get the shade just right, especially when each adjustment requires loading a document into your browser to view the result.
To make life easier, the HTML 4.0 standard defines 16 standard color names that can be used anywhere a numeric color value can be used. You can make all visited ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.