The hwb() functional notation expresses a given color according to its hue, whiteness, and blackness. An optional alpha component represents the color's transparency.

Try it


hwb(194 0% 0%) /* #00c3ff */
hwb(194 0% 0% / .5) /* #00c3ff with 50% opacity */


Functional notation: hwb(H W B[ / A])


An <angle> of the color circle given in degs, rads, grads, or turns in the CSS Color specification. When written as a unitless <number>, it is interpreted as degrees, as specified in the CSS Color Level 3 specification. By definition, red=0deg=360deg, with the other colors spread around the circle, so green=120deg, blue=240deg, etc. As an <angle>, it implicitly wraps around such that -120deg=240deg, 480deg=120deg, -1turn=1turn, etc.

W, B

<percentage> representing whiteness and blackness, respectively, that specifies the amount of white and black to mix in, from 0% (no whiteness or blackness) to 100% (full whiteness or blackness).

If W + B = 100%, it defines some shade of gray. If W + B > 100%, W and B are effectively normalized as W / (W + B) and B / (W + B), respectively.

A Optional

An <alpha-value>, where the number 1 corresponds to 100% (full opacity).

Formal syntax

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

<hue> =
<number> |

<alpha-value> =
<number> |


CSS Color Module Level 4
# the-hwb-notation

Browser compatibility

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