code: public Html checkAndLoadHtmlTemplate(InputStream inputStream)
              throws IOException, Mixer2JAXBException {
          StringBuilder sb = inputStreamToStringBuilder(inputStream);
          return checkAndLoadHtmlTemplate(sb);
      }
docs: This is the same as
  {@link #loadHtmlTemplate(InputStream)} but if fail to
  parse xhtml, throws Mixer2JAXBException.
  
  @see #loadHtmlTemplate(InputStream)
  @param inputStream
  @return html tag object.
  @throws IOException
  @throws Mixer2JAXBException