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
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
1, or a
<percentage>, where the number
|CSS Color Module Level 4||Working Draft||Initial definition|
hwb() value has yet to be implemented in any browser. Mozilla bug: 1352755