gistfile1.txt

            return configure(WKWebView(
                frame: .zero,
                configuration: configure(WKWebViewConfiguration()) {
                    $0.userContentController = configure(WKUserContentController()) {
                        $0.addUserScript(
                            WKUserScript(
                                source: source,
                                injectionTime: .atDocumentEnd,
                                forMainFrameOnly: true
                            )
                        )
                    }
                }
                )
            ){
                $0.isOpaque = false
                $0.backgroundColor = .clear
            }