(function() {
  // ...

  // NOTE: Replace DocumentFragment to work around IE11 bug that
  // causes children of a document fragment modified while
  // there is a mutation observer to not have a parentNode, or
  // have a broken parentNode (!?!)
  if (/Trident/.test(navigator.userAgent)) {
    // ...
    PolyfilledHTMLTemplateElement.decorate = function(template) {
      // ...
      while ((child = template.firstChild)) {
        capturedAppendChild.call(template.content, child);
      }
    // ...
    }
  }
}