a {
  b: rgb(var(--foo), 3, 0.4);
}
a {
  b: rgba(17, 34, 51, 0.5);
}
a {
  b: rgb(0, 0, 255, calc(0.4));
}
a {
  b: rgb(0, 0, 255, var(--foo));
}
a {
  b: rgba(0, 255, 127, 0);
}
a {
  b: springgreen;
}
a {
  b: rgb(calc(1) 2 3);
}
a {
  b: rgba(var(--foo) / 0.4);
}
a {
  b: rgb(calc(1), 2, 3, 0.4);
}
basic {
  transparent: rgba(51, 204, 204, 0);
  opaque: #3cc;
  partial: rgba(51, 204, 204, 0.5);
  named: rgba(51, 204, 204, 0.4);
}
basic {
  transparent: rgba(51, 204, 204, 0);
  opaque: #3cc;
  partial: rgba(51, 204, 204, 0.5);
  named: rgba(51, 204, 204, 0.4);
  parenthesized: rgba(51, 204, 204, 0.4);
}
basic {
  transparent: rgba(0, 255, 127, 0);
  opaque: #beaded;
  partial: rgba(18, 52, 86, 0.5);
  percent: rgba(18, 52, 86, 0.5);
  named: rgba(0, 255, 127, 0.3);
  parenthesized: rgba(0, 255, 127, 0.3);
}