urls.length; i++) {
      const url = css_urls[i];
      const element = document.createElement("link");
      element.onload = on_load;
      element.onerror = on_error.bind(null, url);
      element.rel = "stylesheet";
      element.type = "text/css";
      element.href = url;
      console.debug("Bokeh: injecting link tag for BokehJS stylesheet: ", url);
      document.body.appendChild(element);
    }

    for (let i = 0; i < js_urls.length; i++) {
      const url = js_urls[i];
      const element = docu