border-color: red; is equivalent to

• border-top-color: red;
• border-right-color: red;
• border-bottom-color: red;
• border-left-color: red;

border-color: gold red; is equivalent to

• border-top-color: gold;
• border-right-color: red;
• border-bottom-color: gold;
• border-left-color: red;

border-color: red cyan gold; is equivalent to

• border-top-color: red;
• border-right-color: cyan;
• border-bottom-color: gold;
• border-left-color: cyan;

border-color: red cyan black gold; is equivalent to

• border-top-color: red;
• border-right-color: cyan;
• border-bottom-color: black;
• border-left-color: gold;