One blue and one yellow, blended in four color spaces. The square beside each bar is its exact midpoint, and the numbers say how light that midpoint is.
Ends: --blue: oklch(45.2% 0.313 264.05), which is sRGB's pure blue, #0000ff, with relative luminance ; and --yellow: oklch(96.8% 0.211 109.77), pure yellow, #ffff00, with luminance .
in srgb: average the encoded numbers
Midpoint
in srgb-linear: average the light
Midpoint
in oklab: the default for gradients with newer stops