color-mix()

• Functional notation: color-mix( <color-interpolation-method> , [ [<color>](/en-US/docs/Web/CSS/color_value) && [<percentage [0,100]>](/en-US/docs/Web/CSS/percentage)? ]#{2} )
  • <color-interpolation-method> is the keyword in (for interpolation) followed by either:
    • <rectangular-color-space> or
    • <polar-color-space> and an optional <hue-interpolation-method>.
  • <rectangular-color-space> is one of srgb, srgb-linear, lab, oklab, xyz, xyz-d50, xyz-d65.
  • <polar-color-space> is one of hsl, hwb, lch, oklch.
  • <hue-interpolation-method> is one of shorter, longer, increasing, decreasing followed by the keyword hue.
  • <color> is any valid color
  • <percentage> is a number between 0 and 100 with an optional % sign. If no percentage is specified, the default is 50%.

<color-mix()> = 
  color-mix( <color-interpolation-method> , [ <color> && <percentage [0,100]>? ]#{2} )  

<color-interpolation-method> = 
  in [ <rectangular-color-space> | <polar-color-space> <hue-interpolation-method>? ]  

<rectangular-color-space> = 
  srgb         |
  srgb-linear  |
  lab          |
  oklab        |
  xyz          |
  xyz-d50      |
  xyz-d65      

<polar-color-space> = 
  hsl    |
  hwb    |
  lch    |
  oklch  

<hue-interpolation-method> = 
  [ shorter | longer | increasing | decreasing ] hue  

In a supporting browser, the items have more blue, and therefore less white, as a higher percentage of #34c9eb is mixed in. When no value is given, the percentage defaults to 50%.

<ul>
  <li>0%</li>
  <li>25%</li>
  <li>50%</li>
  <li>75%</li>
  <li>100%</li>
  <li></li>
</ul>

ul {
  display: flex;
  list-style-type: none;
  font-size: 150%;
  gap: 10px;
  border: 2px solid;
  padding: 10px;
}

li {
  padding: 10px;
  flex: 1;
  box-sizing: border-box;
  font-family: monospace;
  outline: 1px solid #34c9eb;
  text-align: center;
}

li:nth-child(1) {
  background-color: color-mix(in srgb, #34c9eb 0%, white);
}

li:nth-child(2) {
  background-color: color-mix(in srgb, #34c9eb 25%, white);
}

li:nth-child(3) {
  background-color: color-mix(in srgb, #34c9eb 50%, white);
}

li:nth-child(4) {
  background-color: color-mix(in srgb, #34c9eb 75%, white);
}

li:nth-child(5) {
  background-color: color-mix(in srgb, #34c9eb 100%, white);
}

li:nth-child(6) {
  background-color: color-mix(in srgb, #34c9eb, white);
}

Hue interpolation methods can be used to control how the <hue> is interpolated between two colors. For shorter the result will be the shortest distance between the two angles (the default) and conversely, longer uses the larger value between the two angles in a circle.

For increasing, the result will be the angle between 0 and 360 degrees and for decreasing the result will be the angle between -360 and 0 degrees.

<div id="shorter">shorter</div>
<div id="longer">longer</div>
<div id="increasing">increasing</div>
<div id="decreasing">decreasing</div>

div {
  width: 100px;
  height: 100px;
  margin: 10px;
  border: 1px solid;
  display: inline-block;
}

/* 20 degrees */
#shorter {
  background-color: color-mix(
    in hsl shorter hue,
    hsl(10 100% 50%),
    hsl(350 100% 50%)
  );
}

/* 340 degrees */
#longer {
  background-color: color-mix(
    in hsl longer hue,
    hsl(10 100% 50%),
    hsl(350 100% 50%)
  );
}

/* The resulting angle is between 0 and 360 degrees */
#increasing {
  background-color: color-mix(
    in hsl increasing hue,
    hsl(10 100% 50%),
    hsl(350 100% 50%)
  );
}

/* The resulting angle is between -360 and 0 degrees */
#decreasing {
  background-color: color-mix(
    in hsl decreasing hue,
    hsl(10 100% 50%),
    hsl(350 100% 50%)
  );
}

• <color_value>
• <hue>