a {
  background-image: conic-gradient(yellow, green);
}

b {
  background-image: conic-gradient(at center, yellow 0%, green 100%);
}

c {
  background-image: conic-gradient(at 50% 50%, yellow, green);
}

d {
  background-image: conic-gradient(at left top, yellow, green);
}

e {
  background-image: conic-gradient(at 25% bottom, red, yellow, green);
}

f {
  background-image: conic-gradient(from 20deg, red, yellow 50%, green);
}

g {
  background-image: conic-gradient(from 0.25turn at 20px 20px, red, yellow, green);
}

h {
  background-image: conic-gradient(from 20deg in oklab, red, yellow, green);
}

i {
  background-image: conic-gradient(in rec2020 at center, red, yellow, green);
}

j {
  background-image: conic-gradient(in hsl longer hue from 10deg, red, yellow, green);
}

k {
  background-image: conic-gradient(in srgb from -10deg at 20px 20px, red, yellow);
}