struct HTMLContentView: UIViewRepresentable, @preconcurrency Equatable {
    static func == (lhs: HTMLContentView, rhs: HTMLContentView) -> Bool {
        lhs.infopost == rhs.infopost && lhs.fontSize == rhs.fontSize
    }
    // остальной код
}

struct DemoToolbarOpacity: View {
    var body: some View {
        NavigationStack {
            Color.green.ignoresSafeArea()
                .toolbar {
                    ToolbarItem(placement: .topBarLeading) {
                        if false {
                            Button("Left") {
                                print("tap left button")
                            }
                        }
                    }
                    ToolbarItem(placement: .topBarTrailing) {
                        Button("right") {
                            print("tap right button")
                        }
                        .opacity(0)
                    }
                }
        }
    }
}

.toolbar {
    if !entries.isEmpty {
        ToolbarItem(placement: .topBarTrailing) {
            deleteAllButton
        }
    }
}

.toolbar {
    ToolbarItem(placement: .topBarTrailing) {
        if !entries.isEmpty {
            deleteAllButton
        }
    }
}