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


hwb(194 0% 0%) /* #00c3ff */
hwb(194 0% 0% / .5) /* #00c3ff with 50% opacity */
hwb(194, 0%, 0%, .5); /* with comma-separated values */


Functional notation: hwb[a](H W B[/ A])
H (hue) is an <angle> of the color circle given in degs, rads, grads, or turns in CSS Color Module Level 4. When written as a unitless <number>, it is interpreted as degrees, as specified in CSS Color Module Level 3. 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 (whiteness) specifies the amount of white to mix in, as a percentage from 0% (no whiteness) to 100% (full whiteness).
B (blackness) specifies the amount of black to mix in, also from 0% (no blackness) to 100% (full blackness).
A (alpha) can be a <number> between 0 and 1, or a <percentage>, where the number 1 corresponds to 100% (full opacity).
Specification Status Comment
CSS Color Module Level 4 Working Draft Initial definition

Browser compatibility

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The hwb() value has yet to be implemented in any browser. Mozilla bug: 1352755