Télécharger sass.js (https://github.com/medialize/sass.js)

  <style id="csscode"></style>

  var sass = new Sass();
  var scss = `
    .my-class {
      color: red;
      
      & .my-subclass {
        color: blue;
      }
    }
  `;
  sass.compile(scss, {
    style: Sass.style.expanded
  }, function(result) {
    document.getElementById('csscode').innerHTML = result.text;
  });