<===> input.scss
*[class|="has-background"] {
    background: #efefef;
    padding: 7px;
    border: 1px solid #888;
    margin-bottom: 5px;
    }
<===> output.css
*[class|="has-background"] {
  background: #efefef;
  padding: 7px;
  border: 1px solid #888;
  margin-bottom: 5px;
}

<===> output-dart-sass.css
*[class|=has-background] {
  background: #efefef;
  padding: 7px;
  border: 1px solid #888;
  margin-bottom: 5px;
}