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Alvaro Montoro

Honorary Tortoise

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HWB

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Warning: This color format is not widely supported at the moment. Be cautious when using it, and avoid relying on it in production environments.

HWB stands for Hue-Whiteness-Blackness, it is a color format close to HSL, but often seen as an easier option for humans to understand and work with.

The HWB parameters represent the following:

  • Hue: an angle in the color circle/wheel.
  • Whiteness: a percentage that represents the amount of white to mix into the color. The higher the value, the clearer/whiter the color.
  • Blackness: a percentage that represents the amount of black to mix in. The higher the value, the darker/blacker the color will be.

Description of how HWB is calculated with the color wheel and a triangle showcasing the different colors depending on the whiteness and darkness value from 0% to 100%

As this is a new color function, it automatically comes with the space-separated notation and there is no comma-separated notation (and not hwba). This is the only syntax to use:

HWB syntax: hue value in number or degrees, space, whiteness in percentage, space, blackness in percentage, and optionally, forward slash and alpha in number or percentage

If the values of white and black add up to 100% (after normalization), the color will be achromatic: a shade of gray without any hint of the original hue value.

This simple syntax allows for 6 different combinations to represent the same color:

color: hwb(180 0% 0%);
color: hwb(180 0% 0% / 1);  
color: hwb(180 0% 0% / 100%);
color: hwb(180deg 0% 0%);
color: hwb(180deg 0% 0% / 1);
color: hwb(180deg 0% 0% / 100%);

None of the tested browsers supported the hwb() function.

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