/* Named colors */
rebeccapurple
aliceblue

/* RGB Hexadecimal */
#f09
#ff0099

/* RGB (Red, Green, Blue) */
rgb(255 0 153)
rgb(255 0 153 / 80%)

/* HSL (Hue, Saturation, Lightness) */
hsl(150 30% 60%)
hsl(150 30% 60% / 0.8)

/* HWB (Hue, Whiteness, Blackness) */
hwb(12 50% 0%)
hwb(194 0% 0% / 0.5)

/* LAB (Lightness, A-axis, B-axis) */
lab(50% 40 59.5)
lab(50% 40 59.5 / 0.5)

/* LCH (Lightness, Chroma, Hue) */
lch(52.2% 72.2 50)
lch(52.2% 72.2 50 / 0.5)

/* Oklab (Lightness, A-axis, B-axis) */
oklab(59% 0.1 0.1)
oklab(59% 0.1 0.1 / 0.5)

/* Oklch (Lightness, Chroma, Hue) */
oklch(60% 0.15 50)
oklch(60% 0.15 50 / 0.5)

A <color> value can be specified using one of the methods listed below:

• By keywords: <named-color> (such as blue or pink), <system-color>, and currentcolor.
• By hexadecimal notations: <hex-color> (such as #ff0000).
• By parameters in a color space using functional notations:
  • sRGB color space: hsl(), hwb(), rgb();
  • CIELAB color space: lab(), lch();
  • Oklab color space: oklab(), oklch();
  • Other color spaces: color().
• By mixing two colors: color-mix().

The currentcolor keyword represents the value of an element's color property. This lets you use the color value on properties that do not receive it by default.

If currentcolor is used as the value of the color property, it instead takes its value from the inherited value of the color property.

<div style="color: blue; border: 1px dashed currentcolor;">
  The color of this text is blue.
  <div style="background: currentcolor; height:9px;"></div>
  This block is surrounded by a blue border.
</div>

Each component of any CSS color functions - except for those using the legacy comma-separated syntax - can be specified as the keyword none to be a missing component.

Explicitly specifying missing components is useful in color interpolation for cases where you would like to interpolate some color components but not others. For all other purposes, a missing component will effectively have a zero value in an appropriate unit: 0, 0%, or 0deg. For example, the following colors are equivalent when used outside of interpolation:

/* These are equivalent */
color: oklab(50% none -0.25);
color: oklab(50% 0 -0.25);

/* These are equivalent */
background-color: hsl(none 100% 50%);
background-color: hsl(0deg 100% 50%);

Color interpolation happens with gradients, transitions, and animations.

When interpolating <color> values, they are first converted to a given color space, and then each component of the computed values are interpolated linearly, with interpolation's speed being determined by the easing function in transitions and animations. The interpolation color space defaults to Oklab, but can be overridden through <color-interpolation-method> in some color-related functional notations.

Interpolating colors in the same space

When interpolating colors that are exactly in the interpolation color space, missing components from one color are replaced with existing values of the same components from the other color. For example, the following two expressions are equivalent:

color-mix(in oklch, oklch(none 0.2 10), oklch(60% none 30))
color-mix(in oklch, oklch(60% 0.2 10), oklch(60% 0.2 30))

Interpolating colors from different spaces: analogous components

If any color to be interpolated is not in the interpolation color space, its missing components are transferred into the converted color based on analogous components of the same category as described in the following table:

For example:

• X (0.2) in color(xyz 0.2 0.1 0.6) is analogous to R (50%) in rgb(50% 70% 30%).
• H (0deg) in hsl(0deg 100% 80%) is analogous to H (140) in oklch(80% 0.1 140).

Using Oklch as the interpolation color space and the two colors below as an example:

lch(80% 30 none)
color(display-p3 0.7 0.5 none)

the preprocessing procedure is:

1. Replace the missing components in both colors with a zero value:

   css

   lch(80% 30 0)
   color(display-p3 0.7 0.5 0)
   

2. Convert both colors into the interpolation color space:

   css

   oklch(83.915% 0.0902 0.28)
   oklch(63.612% 0.1522 78.748)
   

3. If any component of the converted colors is analogous to a missing component in the corresponding original color, reset it as a missing component:

   css

   oklch(83.915% 0.0902 none)
   oklch(63.612% 0.1522 78.748)
   

4. Replace any missing component with the same component from the other converted color:

   css

   oklch(83.915% 0.0902 78.748)
   oklch(63.612% 0.1522 78.748)
   

Some people have difficulty distinguishing colors. The WCAG 2.2 recommendation strongly advises against using color as the only means of conveying a specific message, action, or result. See color and color contrast for more information.

<color> = 
  <absolute-color-base>  |
  currentcolor           |
  <system-color>         

<absolute-color-base> = 
  <hex-color>                |
  <absolute-color-function>  |
  <named-color>              |
  transparent                

<absolute-color-function> = 
  <rgb()>    |
  <rgba()>   |
  <hsl()>    |
  <hsla()>   |
  <hwb()>    |
  <lab()>    |
  <lch()>    |
  <oklab()>  |
  <oklch()>  |
  <color()>  

<rgb()> = 
  rgb( [ <percentage> | none ]{3} [ / [ <alpha-value> | none ] ]? )  |
  rgb( [ <number> | none ]{3} [ / [ <alpha-value> | none ] ]? )  |
  rgb( <percentage>#{3} , <alpha-value>? )            |
  rgb( <number>#{3} , <alpha-value>? )                |
  rgb( [ <percentage> | none ]{3} [ / [ <alpha-value> | none ] ]? )  |
  rgb( [ <number> | none ]{3} [ / [ <alpha-value> | none ] ]? )  

<hsl()> = 
  hsl( [ <hue> | none ] [ <percentage> | none ] [ <percentage> | none ] [ / [ <alpha-value> | none ] ]? )  |
  hsl( <hue> , <percentage> , <percentage> , <alpha-value>? )  |
  hsl( [ <hue> | none ] [ <percentage> | none ] [ <percentage> | none ] [ / [ <alpha-value> | none ] ]? )  

<hwb()> = 
  hwb( [ <hue> | none ] [ <percentage> | none ] [ <percentage> | none ] [ / [ <alpha-value> | none ] ]? )  

<lab()> = 
  lab( [ <percentage> | <number> | none ] [ <percentage> | <number> | none ] [ <percentage> | <number> | none ] [ / [ <alpha-value> | none ] ]? )  

<lch()> = 
  lch( [ <percentage> | <number> | none ] [ <percentage> | <number> | none ] [ <hue> | none ] [ / [ <alpha-value> | none ] ]? )  

<oklab()> = 
  oklab( [ <percentage> | <number> | none ] [ <percentage> | <number> | none ] [ <percentage> | <number> | none ] [ / [ <alpha-value> | none ] ]? )  

<oklch()> = 
  oklch( [ <percentage> | <number> | none ] [ <percentage> | <number> | none ] [ <hue> | none ] [ / [ <alpha-value> | none ] ]? )  

<color()> = 
  color( <colorspace-params> [ / [ <alpha-value> | none ] ]? )  

<alpha-value> = 
  <number>      |
  <percentage>  

<hue> = 
  <number>  |
  <angle>   

<colorspace-params> = 
  <predefined-rgb-params>  |
  <xyz-params>             

<predefined-rgb-params> = 
  <predefined-rgb> [ <number> | <percentage> | none ]{3}  

<xyz-params> = 
  <xyz-space> [ <number> | <percentage> | none ]{3}  

<predefined-rgb> = 
  srgb          |
  srgb-linear   |
  display-p3    |
  a98-rgb       |
  prophoto-rgb  |
  rec2020       

<xyz-space> = 
  xyz      |
  xyz-d50  |
  xyz-d65  

In this example we provide a <div> and a text input. Entering a valid color into the input causes the <div> to adopt that color, allowing you to test our color values.

HTML

<div></div>
<hr />
<label for="color">Enter a valid color value:</label>
<input type="text" id="color" />

Result

This example shows fully saturated sRGB colors in the sRGB color space.

HTML

<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>

CSS

div:nth-child(1) {
  background-color: hsl(0 100% 50%);
}
div:nth-child(2) {
  background-color: hsl(30 100% 50%);
}
div:nth-child(3) {
  background-color: hsl(60 100% 50%);
}
div:nth-child(4) {
  background-color: hsl(90 100% 50%);
}
div:nth-child(5) {
  background-color: hsl(120 100% 50%);
}
div:nth-child(6) {
  background-color: hsl(150 100% 50%);
}
div:nth-child(7) {
  background-color: hsl(180 100% 50%);
}
div:nth-child(8) {
  background-color: hsl(210 100% 50%);
}
div:nth-child(9) {
  background-color: hsl(240 100% 50%);
}
div:nth-child(10) {
  background-color: hsl(270 100% 50%);
}
div:nth-child(11) {
  background-color: hsl(300 100% 50%);
}
div:nth-child(12) {
  background-color: hsl(330 100% 50%);
}

Result

This example shows reds of different shades in the sRGB color space.

HTML

<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>

CSS

div:nth-child(1) {
  background-color: hsl(0 100% 0%);
}
div:nth-child(2) {
  background-color: hsl(0 100% 20%);
}
div:nth-child(3) {
  background-color: hsl(0 100% 40%);
}
div:nth-child(4) {
  background-color: hsl(0 100% 60%);
}
div:nth-child(5) {
  background-color: hsl(0 100% 80%);
}
div:nth-child(6) {
  background-color: hsl(0 100% 100%);
  border: solid;
}

Result

This example shows reds of different saturations in the sRGB color space.

HTML

<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>

CSS

div:nth-child(1) {
  background-color: hsl(0 0% 50%);
}
div:nth-child(2) {
  background-color: hsl(0 20% 50%);
}
div:nth-child(3) {
  background-color: hsl(0 40% 50%);
}
div:nth-child(4) {
  background-color: hsl(0 60% 50%);
}
div:nth-child(5) {
  background-color: hsl(0 80% 50%);
}
div:nth-child(6) {
  background-color: hsl(0 100% 50%);
}

Result

• opacity: the property defining transparency at the element level
• <hue>: the data type representing the hue angle of a color
• color, background-color, border-color, box-shadow, outline-color, text-shadow: common properties that use <color>
• Applying color to HTML elements using CSS
• New functions, gradients, and hues in CSS colors (Level 4) on MDN blog (2023)