Comments are not rendered, that's the point. They are notes between authors, or notes to self, or editorial suggestions and commands. Nothing is rendered as html. These use critic markup.
{++ additions ++}
{-- delete this --}
{>> here 2018-01-11 at 10:28 <<}
{~~ EeCircuitLoopIMCP ~> EeCircuitLoop ~~}
{== highlight and ==}{>> comment <<}