body {
  order: 1;
}
body, 
not {
  order: 2;
}
em[attr=:not],
em[attr=":not"] {
  order: 3;
}
em[attr~=:not],
em[attr~=":not"] {
  order: 4;
}
em[not=abc], 
em[not="abc"] {
  order: 5;
}
:not {
  order: 6;
}
:not(a):not(b) {
  order: 7;
}
:not(a):not(b) {
  order: 7.1;
}
tag:not(.class):not(.class2) {
  order: 8;
}
tag :not(tag2):not(tag3) {
  order: 9;
}
tag :not(tag2):not(tag3) :not(tag4):not(tag5) {
  order: 10;
}
tag :not(tag2):not(tag3) :not(tag4):not(tag5), 
test {
  order: 11;
}
tag :not(tag2 :not(tag4):not(tag5)):not(tag3) {
  order: 12;
}
.foo:not(:nth-child(-n+2)):not(.bar) {
  order: 13;
}
a:not(.b):not(.c) {
  order: 14;
}
.foo:not(:hover):not(:focus)::before {
  order: 15;
}
.foo\\:not-italic {
  order: 16;
}
.foo\\:not-italic:not(:hover):not(:focus) {
  order: 17;
}
:not :dir(ltr) {
  order: 18;
}
:not(something > complex):not(other) {
  order: 19;
}
div:not([style*="(120, 60, 12"]) {
  order: 20;
}
@supports selector(:not(something > complex, other)) {
  :not(something > complex):not(other) {
    order: 19;
  }
}
:not(h1):not(h2):not(h3) {
  color: red;
}
:not(h1) {
  color: red;
}