The gray() functional notation simplifies specifying this common set of colors, so that only a single numerical parameter is required, and so that gray(50%) is a visual mid-gray (perceptually equidistant between black and white).

]]> HWB (short for Hue-Whiteness-Blackness) is another method of specifying colors, similar to HSL, but often even easier for humans to work with. It describes colors with a starting hue, then a degree of whiteness and blackness to mix into that base hue.

]]> The color() function takes an existing color, and applies zero or more color adjusters to it, which specify how to manipulate the color in some way.

]]> The color-adjust property provides a hint to the user-agent about how it should treat color and style choices that might be expensive or generally unwise on a given device, such as using light text on a dark background in a printed document.

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