<script>
  let styleDoc = fetch("bug1309630.sjs")
    .then(response => {
      if (response.ok) {
        return response.text();
      }
      return Promise.reject();
    }).then(xslt => {
      let styleDoc = new DOMParser().parseFromString(xslt, "text/xml");
      let originalDoc = new DOMParser().parseFromString(
        "<root/>",
        "text/xml"
      );

      let processor = new XSLTProcessor();
      processor.importStylesheet(styleDoc);
      processor.transformToDocument(originalDoc);
    });
</script>>
