autoprefixer/test/cases/at-rules.out.css

body {
  -webkit-appearance: none;
     -moz-appearance: none;
          appearance: none;
}

.block {
  -webkit-transform: translate(20px, 30px);
          transform: translate(20px, 30px);
}

@-webkit-region .region {
  .block {
    -webkit-transform: translate(20px, 30px);
            transform: translate(20px, 30px);
  }

  .block__button {
    -webkit-appearance: none;
            appearance: none;
  }
}

@-moz-document domain('example.com') {
  body {
    -moz-appearance: none;
         appearance: none;
  }

  .block {
    transform: translate(20px, 30px);
  }
}