@supports (--element(".minwidth", { "minWidth": 300 })) {
  [--self] {
    background: greenyellow;
  }
}

@supports ({"example": 1}) {
  * { background: red; }
}

@supports (("example": 1)) {
  * { background: red; }
}

@supports (func("example": 1)) {
  * { background: red; }
}

@supports (--var) {
  * { background: red; }
}

@supports ([]) {
  * { background: red; }
}

@supports ([color: red]) {
  * { background: red; }
}

@supports ([[[[[{ --func(color: { red }) }]]]]]) {
  * { background: red; }
}