Content inside Weweb built-in accordion and tab elements will be pre-rendered or not?

Does anyone know whether the content inside Weweb built-in accordion and tab elements will be pre-rendered or will they only be rendered in the DOM only when the condition to display it is met?
(e.g. when the accordion is opened)

I just want to make sure if it is right choice to use built-in accordion element from SEO standpoint.
or Should I use “CSS display:none” instead to optimize SEO better?