HTML and CSS Reference
In-Depth Information
note You cannot mix integers and percentages in the same color unit desig-
nation. White is rgb(255,255,255) or rgb(100%,100%,100%) , but not
rgb(255,100%,255) .
The hue-saturation-lightness color scheme offers a way to look at the
color wheel that can be more intuitive when working with colors of a
similar hue or tonality. Hue ( h ) is a number from 0 to 360 representing
a radial position on the color wheel (0 or 360=red, 120=green, 240=blue).
Saturation ( s ) is a percentage value from 0 to 100 percent with values
closer to 0 percent approaching desaturated, or gray. Lightness ( l ) is
again a percentage value from 0 to 100 percent, where 0 percent is black
and 100 percent is white.
.error { border-color: hsl(0, 75%, 38%); } /* a muted red */
A chart of HSL colors in the CSS3 Color Module specification ( http:// TR/css3-color/#hsl-examples ) illustrates how the three
scales work together to create colors.
Color Keywords
The HTML 4 specification defined the following 16 color keywords and
their corresponding hex values: aqua , black , blue , fuchsia , gray , green ,
lime , maroon , navy , olive , purple , red , silver , teal , white , and yellow .
Keywords are case insensitive and are not placed between quotes.
body { color: red ; }
Several (131 to be exact) more commonly supported color keywords, such
as pink , plum , deepskyblue , and firebrick , originally defined in the SVG
specification, were added in CSS3, bringing the number of color keywords
to 147.
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