HSL stands for hue, saturation, and lightness.
HSLA color values are an extension of HSL with an Alpha channel (opacity).
Below is an HSL color. Set different values for Hue, Saturation and Lightness to make different colors.
Example:
HTML
<!DOCTYPE html>
<html>
<head>
<title>HTML HSL Color Example</title>
</head>
<body>
<h1 style="background-color:hsl(0,100%,50%);">Background Color is set by value hsl(0,100%,50%)</h1>
<h1 style="background-color:hsl(160,60%,40%);">Background Color is set by value hsl(160,60%,40%)</h1>
<h1 style="background-color:hsl(260,70%,60%);">Background Color is set by value hsl(260,70%,60%)</h1>
</body>
</html>
In HTML, a color can be specified using hue, saturation, and lightness (HSL) in the form:
hsl(hue, saturation, lightness)
Hue is a degree on the color wheel from 0 to 360. 0 is red, 120 is green, and 240 is blue.
Saturation is a percentage value. 0% means a shade of gray, and 100% is the full color.
Lightness is also a percentage value. 0% is black, and 100% is white.
Example:
HTML
<!DOCTYPE html>
<html>
<body>
<h1 style="background-color:hsl(0, 100%, 50%);">hsl(0, 100%, 50%)</h1>
<h1 style="background-color:hsl(240, 100%, 50%);">hsl(240, 100%, 50%)</h1>
<h1 style="background-color:hsl(147, 50%, 47%);">hsl(147, 50%, 47%)</h1>
<h1 style="background-color:hsl(300, 76%, 72%);">hsl(300, 76%, 72%)</h1>
<h1 style="background-color:hsl(39, 100%, 50%);">hsl(39, 100%, 50%)</h1>
<h1 style="background-color:hsl(248, 53%, 58%);">hsl(248, 53%, 58%)</h1>
</body>
</html>
Saturation can be described as the intensity of a color.
100% is pure color, no shades of gray.
50% is 50% gray, but you can still see the color.
0% is completely gray; you can no longer see the color.
Example:
HTML
<!DOCTYPE html>
<html>
<body>
<h1 style="background-color:hsl(0, 100%, 50%);">hsl(0, 100%, 50%)</h1>
<h1 style="background-color:hsl(0, 80%, 50%);">hsl(0, 80%, 50%)</h1>
<h1 style="background-color:hsl(0, 60%, 50%);">hsl(0, 60%, 50%)</h1>
<h1 style="background-color:hsl(0, 40%, 50%);">hsl(0, 40%, 50%)</h1>
<h1 style="background-color:hsl(0, 20%, 50%);">hsl(0, 20%, 50%)</h1>
<h1 style="background-color:hsl(0, 0%, 50%);">hsl(0, 0%, 50%)</h1>
<p>With HSL colors, less saturation mean less color. 0% is completely gray.</p>
</body>
</html>
The lightness of a color can be described as how much light you want to give the color, where 0% means no light (black), 50% means 50% light (neither dark nor light), and 100% means full lightness (white).
Example:
HTML
<!DOCTYPE html>
<html>
<body>
<h1 style="background-color:hsl(0, 100%, 0%);">hsl(0, 100%, 0%)</h1>
<h1 style="background-color:hsl(0, 100%, 25%);">hsl(0, 100%, 25%)</h1>
<h1 style="background-color:hsl(0, 100%, 50%);">hsl(0, 100%, 50%)</h1>
<h1 style="background-color:hsl(0, 100%, 75%);">hsl(0, 100%, 75%)</h1>
<h1 style="background-color:hsl(0, 100%, 90%);">hsl(0, 100%, 90%)</h1>
<h1 style="background-color:hsl(0, 100%, 100%);">hsl(0, 100%, 100%)</h1>
<p>With HSL colors, 0% lightness means black, and 100 lightness means white.</p>
</body>
</html>
Shades of gray are often defined by setting the hue and saturation to 0, and adjusting the lightness from 0% to 100% to get darker/lighter shades:
Example:
HTML
<!DOCTYPE html>
<html>
<body>
<h1 style="background-color:hsl(0, 0%, 20%);">hsl(0, 0%, 20%)</h1>
<h1 style="background-color:hsl(0, 0%, 30%);">hsl(0, 0%, 30%)</h1>
<h1 style="background-color:hsl(0, 0%, 40%);">hsl(0, 0%, 40%)</h1>
<h1 style="background-color:hsl(0, 0%, 60%);">hsl(0, 0%, 60%)</h1>
<h1 style="background-color:hsl(0, 0%, 70%);">hsl(0, 0%, 70%)</h1>
<h1 style="background-color:hsl(0, 0%, 90%);">hsl(0, 0%, 90%)</h1>
</body>
</html>
HSLA color values are an extension of HSL color values, with an Alpha channel - which specifies the opacity for a color.
An HSLA color value is specified with:
hsla(hue, saturation, lightness, alpha)
The alpha parameter is a number between 0.0 (fully transparent) and 1.0 (not transparent at all):
Example:
HTML
<!DOCTYPE html>
<html>
<body>
<h1 style="background-color:hsla(9, 100%, 64%, 0);">hsla(9, 100%, 64%, 0)</h1>
<h1 style="background-color:hsla(9, 100%, 64%, 0.2);">hsla(9, 100%, 64%, 0.2)</h1>
<h1 style="background-color:hsla(9, 100%, 64%, 0.4);">hsla(9, 100%, 64%, 0.4)</h1>
<h1 style="background-color:hsla(9, 100%, 64%, 0.6);">hsla(9, 100%, 64%, 0.6)</h1>
<h1 style="background-color:hsla(9, 100%, 64%, 0.8);">hsla(9, 100%, 64%, 0.8)</h1>
<h1 style="background-color:hsla(9, 100%, 64%, 1);">hsla(9, 100%, 64%, 1)</h1>
</body>
</html>