.rect-a {
  rect: 30px 50px #ff0;
}
.rect-b {
  rect: 30px * #ff0;
}
.rect-c {
  rect: * 50px #ff0;
}
.rect-d {
  rect: * * #ff0;
}
.rect-e {
  rect: 30px 50px *;
}
.circle-a {
  circle: 50px #ff0;
}
.circle-b {
  circle: 50px *;
}
.triangle-a {
  triangle: 5px top #ff0;
}
.triangle-b {
  triangle: 5px bottom #ff0;
}
.triangle-c {
  triangle: 5px left #ff0;
}
.triangle-d {
  triangle: 5px right #ff0;
}