User blog comment:BertH/Migrating Forum Content to Discussions/@comment-25239866-20170812013613/@comment-28083312-20170812163855

It really depends on the template. If the template relies on JavaScript, I would expect it to die a silent death (a JS dependent iFrame died in just such a fashion on my Wiki) but simple tophat templates should display properly due to the raw HTML output being what is displayed. An example can be seen here.