.example-1 {
  border-color: blue blue *;
}
.example-2 {
  border-width: 1px *;
}
.example-3 {
  border: 1px 2px / solid / red orange;
}
/* becomes */
.example-1 {
  border-top-color: blue;
  border-right-color: blue;
  border-left-color: blue;
}
.example-2 {
  border-top-width: 1px;
  border-bottom-width: 1px;
}
.example-3 {
  border-width: 1px 2px;
  border-style: solid;
  border-color: red orange;
}

.example-1 {
  -x-border-color: blue blue *;
}
/* becomes */
.example-1 {
  border-top-color: blue;
  border-right-color: blue;
  border-left-color: blue;
}

.example-1 {
  border-color: blue blue -;
}
/* becomes */
.example-1 {
  border-top-color: blue;
  border-right-color: blue;
  border-left-color: blue;
}