a { border-property: 1 2 3 4; } b { border-property: 1 2 3; } c { border-property: 1 2; } d { border-property: 1; } e { border-property: 0 0 0 0; } f { border-property: 1px 2px 3 4px; } g { border-property: 5 oops 6 7; } h { border-property: true; } i { border-property: -1; } j { border-property: -5px; } k { border-property: 3units; } l { border-property: 1 2 3 4units; } m { border-property: 1 2 3 4 5; } n { border-property: 1 2 ; 4; } o { border-property: none }