structuredAttrs is enabled

trying https://registry.npmjs.org/rehype-class-names/-/rehype-class-names-2.0.0.tgz
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed
100   1593 100   1593   0      0  37233      0                              0