HTML#KeepId.KeepClass,
a[HREF=KeepAttrValue]:HOVER::FIRST-letter,
svg[viewBox] linearGradient,
:Not(:NTH-child(2N+1)) {
    COLOR: #AAbbCC;
    BACKGROUND-image: URL("KeepString");
    Margin: 5PX .2E10Em;
    --Keep-custom-Prop: red;
    background: Var(--Keep-custom-Prop);
    animation-name: KeepAnimationName;
    important: something !IMPORTANT;
    font-family: INITIAL;
    -WEBKIT-USER-SELECT: none;
    USER-SELECT: none;
}
@keyframes KeepAnimationName {
  FROM {
    prop: val;
  }
  #{$KeepInterpolationVar},
  #{$Keep + 15PX + Keep15PX + '15PX' + "15PX"},
  #{$Keep + $Keep15PX} {
    prop: val;
  }
}
