a {
  border-image-width: 1 2 3 4;
}

b {
  border-image-width: 1 2 3;
}

c {
  border-image-width: 1 2;
}

d {
  border-image-width: 1;
}

e {
  border-image-width: 0 0 0 0;
}

f {
  border-image-width: 1px 2px 3 4px;
}

g {
  border-image-width: 5 oops 6 7;
}

h {
  border-image-width: true;
}

i {
  border-image-width: -1;
}

j {
  border-image-width: -5px;
}

k {
  border-image-width: 3units;
}

l {
  border-image-width: 1 2 3 4units;
}

m {
  border-image-width: 1 2 3 4 5;
}

n {
  border-image-width: 1 2 ; 4;
}