a {
  opacity: 0;
}

b {
  opacity: 1;
}

c {
  opacity: -1;
}

d {
  opacity: 2147483647;
}

e {
  opacity: -2147483648;
}

f {
  opacity: 1;
}

g {
}

h {
}

i {
  opacity: 377;
}

j {
}

k {
}

l {
  opacity: 3;
}

m {
}

n {
}