Board Thread:Support Requests - Designing Your Wiki/@comment-36535642-20191207102315/@comment-9605025-20191207200222

Yes, and it already is. But what is it you want to have displayed? What is behind it that you want to see? It is not possible to have a portion of the page be entirely transparent as there will always be another element behind whichever one is transparent. Well, unless you make absolutely everything transparent but then browser defaults will kick-in because there is no physical way to have a screen show a truly transparent pixel.