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SassMeister-input.sass

// Sass v3.2.5

parent
  background: orange
  @supports ((perspective: 10px) or (-moz-perspective: 10px))
    child
      background: blue

SassMeister-input.scss

// Sass v3.2.5

parent {
  background: orange;
  @supports ((perspective: 10px) or (-moz-perspective: 10px)) {
    child {
      background: blue;
    }
  }
}

SassMeister-output.css

parent {
  background: orange;
  @supports ((perspective: 10px) or (-moz-perspective: 10px)) {
    child {
      background: blue;
    }
}

}