code: public HtmlPolicyBuilder disallowWithoutAttributes(String... elementNames) {
      invalidateCompiledState();
      for (String elementName : elementNames) {
        elementName = HtmlLexer.canonicalName(elementName);
        skipIfEmpty.add(elementName);
      }
      return this;
    }
docs: Disallows the given elements from appearing without attributes.
  
  @see #DEFAULT_SKIP_IF_EMPTY
  @see #allowWithoutAttributes