private static boolean isAvailableOnDescriptor(@Nullable XmlElementDescriptor descriptor) {
    if (descriptor == null) return false;
    final @NonNls String name = descriptor.getName();
    return HtmlUtil.STYLE_TAG_NAME.equals(name) || HtmlUtil.SCRIPT_TAG_NAME.equals(name);
  }
private static boolean isAvailableOnDescriptor(@Nullable XmlElementDescriptor descriptor)