color

color: rebeccapurple;

color: #00a400;

color: rgb(214, 122, 127);

color: hsl(30deg 82% 43%);

color: hsla(237deg 74% 33% / 61%);

color: hwb(152deg 0% 58% / 70%);

<section id="default-example">
  <div class="example-container">
    <p id="example-element">
      London. Michaelmas term lately over, and the Lord Chancellor sitting in
      Lincoln's Inn Hall. Implacable November weather.
    </p>
  </div>
</section>

#example-element {
  font-size: 1.5em;
}

.example-container {
  background-color: white;
  padding: 10px;
}

/* 关键字值 */
color: currentcolor;

/* <named-color> 值 */
color: red;
color: orange;
color: tan;
color: rebeccapurple;

/* <hex-color> 值 */
color: #090;
color: #009900;
color: #090a;
color: #009900aa;

/* <rgb()> 值 */
color: rgb(34, 12, 64, 0.6);
color: rgba(34, 12, 64, 0.6);
color: rgb(34 12 64 / 0.6);
color: rgba(34 12 64 / 0.3);
color: rgb(34 12 64 / 60%);
color: rgba(34.6 12 64 / 30%);

/* <hsl()> 值 */
color: hsl(30, 100%, 50%, 0.6);
color: hsla(30, 100%, 50%, 0.6);
color: hsl(30 100% 50% / 0.6);
color: hsla(30 100% 50% / 0.6);
color: hsl(30 100% 50% / 60%);
color: hsla(30.2 100% 50% / 60%);

/* <hwb()> 值 */
color: hwb(90 10% 10%);
color: hwb(90 10% 10% / 0.5);
color: hwb(90deg 10% 10%);
color: hwb(1.5708rad 60% 0%);
color: hwb(0.25turn 0% 40% / 50%);

/* 全局值 */
color: inherit;
color: initial;
color: revert;
color: revert-layer;
color: unset;

p {
  color: red;
}
p {
  color: #f00;
}
p {
  color: #ff0000;
}
p {
  color: rgb(255, 0, 0);
}
p {
  color: rgb(100%, 0%, 0%);
}
p {
  color: hsl(0, 100%, 50%);
}

/* 50% 透明 */
p {
  color: #ff000080;
}
p {
  color: rgba(255, 0, 0, 0.5);
}
p {
  color: hsla(0, 100%, 50%, 0.5);
}