description="This 1976 u'v' diagram shows the chromaticity of colors (flattened to 2D, so lightness is not shown). The outer curved shape represents the spectrum of pure single wavelengths; there are no visible colors outside this. The straight line is purple, a mixture of red and violet. The smaller, grey, triangle is the sRGB gamut while the larger, darker triangle is the display-p3 gamut. The 23 unique display-p3 colors actually in use on the web in 2020 are shown; for each pair of colors the larger circle is the sRGB fallback while the smaller circle is the display-p3 color. If it is inside the sRGB gamut, those circles show the correct color. Otherwise, a white circle with a red edge indicates out of sRGB-gamut colors.",
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