Example from specification

• "a", width:auto (that is 1*), height:auto(that is max-intrinsic)
• "b", width:150px, height:max-intrinsic
• "c", width:*, height:* (a.k.a. shrink-to-fit)
• "d", width:150px, height:*
• "e", width:150px, height:*
• "f", width:150, height:150px