CSS二次曲线梯度

CSS二次曲线梯度演示例程：

conic-gradient() = conic-gradient(
  [ from  ]? [ at  ]?,
    <angular-color-stop-list>
)
.conic-gradient {
  background: conic-gradient(#fff, #000);
}
.conic-gradient {
  /* Original example */
  background-image: conic-gradient(#fff, #000);
  /* Explicitly state the location center point */
  background: conic-gradient(at 50% 50%, #fff, #000);
  /* Explicitly state the angle of the start color */
  background: conic-gradient(from 0deg, #fff, #000);
  /* Explicitly state the angle of the start color and center point location */
  background: conic-gradient(from 0deg at center, #fff, #000);
  /* Explicitly state the angles of both colors as percentages instead of degrees */
  background: conic-gradient(#fff 0%, #000 100%);
  /* Explicitly state the angle of the starting color in degrees and the ending color by a full turn of the circle */
  background: conic-gradient(#fff 0deg, #000 1turn);
}