diff --git a/cmake/dependencies/fmt.cmake b/cmake/dependencies/fmt.cmake
index de31954..35e6afb 100644
--- a/cmake/dependencies/fmt.cmake
+++ b/cmake/dependencies/fmt.cmake
@@ -1,6 +1,6 @@
 option(NUI_FETCH_FMT "Fetch fmt" ON)
 set(NUI_FMT_GIT_REPOSITORY "https://github.com/fmtlib/fmt.git" CACHE STRING "fmt git repository")
-set(NUI_FMT_GIT_TAG "5f774c0aed4af6494b412cd3883e0f09295bd79d" CACHE STRING "fmt git tag")
+set(NUI_FMT_GIT_TAG "4e8640ed90ac8751d4a8ca500b893cc8c4bb9668" CACHE STRING "fmt git tag")
 
 if (NUI_FETCH_FMT)
     include(FetchContent)
diff --git a/cmake/dependencies/roar.cmake b/cmake/dependencies/roar.cmake
index f38ce52..8f352c8 100644
--- a/cmake/dependencies/roar.cmake
+++ b/cmake/dependencies/roar.cmake
@@ -1,6 +1,6 @@
 option(NUI_FETCH_ROAR "Fetch roar" ON)
 set(NUI_ROAR_REPOSITORY "https://github.com/5cript/roar.git" CACHE STRING "roar repository")
-set(NUI_ROAR_TAG "4fe66b20d9d99d1fe2953048a7a6c65ce9a751c7" CACHE STRING "roar tag")
+set(NUI_ROAR_TAG "f88b5f46e145376d392c43dc621690f58278582c" CACHE STRING "roar tag")
 
 if(NUI_FETCH_ROAR)
     include(FetchContent)
diff --git a/nui/include/nui/backend/backend.hpp b/nui/include/nui/backend/backend.hpp
new file mode 100644
index 0000000..4432ccf
--- /dev/null
+++ b/nui/include/nui/backend/backend.hpp
@@ -0,0 +1,6 @@
+#pragma once
+
+#include <nui/backend/filesystem/special_paths.hpp>
+#include <nui/backend/filesystem/file_dialog.hpp>
+#include <nui/backend/rpc_hub.hpp>
+#include <nui/backend/url.hpp>
\ No newline at end of file
diff --git a/nui/include/nui/frontend/attributes/style.hpp b/nui/include/nui/frontend/attributes/style.hpp
index e0c8fc1..a229186 100644
--- a/nui/include/nui/frontend/attributes/style.hpp
+++ b/nui/include/nui/frontend/attributes/style.hpp
@@ -156,24 +156,24 @@ namespace Nui::Attributes
         auto operator=(char const* value)
         {
             return StylePropertyImpl{
-                [name = std::string{name}, value = std::string{value}]() {
-                    return name + ":" + value;
+                [name_ = std::string{name}, value = std::string{value}]() {
+                    return name_ + ":" + value;
                 },
                 nullptr};
         }
         auto operator=(std::string value)
         {
             return StylePropertyImpl{
-                [name = std::string{name}, value = std::move(value)]() {
-                    return name + ":" + value;
+                [name_ = std::string{name}, value = std::move(value)]() {
+                    return name_ + ":" + value;
                 },
                 nullptr};
         }
         auto operator=(Observed<std::string>& observedValue)
         {
             return StylePropertyImpl{
-                [name = std::string{name}, &observedValue]() {
-                    return name + ":" + observedValue.value();
+                [name_ = std::string{name}, &observedValue]() {
+                    return name_ + ":" + observedValue.value();
                 },
                 observedValue};
         }
@@ -181,8 +181,8 @@ namespace Nui::Attributes
         auto operator=(ObservedValueCombinatorWithGenerator<FunctionT, ArgsT...>&& combinator)
         {
             return StylePropertyImpl{
-                [name = std::string{name}, gen = combinator.generator()]() {
-                    return name + ":" + gen();
+                [name_ = std::string{name}, gen = combinator.generator()]() {
+                    return name_ + ":" + gen();
                 },
                 std::move(combinator)};
         }
diff --git a/nui/include/nui/frontend/elements/impl/materialize.hpp b/nui/include/nui/frontend/elements/impl/materialize.hpp
index f93e2f7..b78b710 100644
--- a/nui/include/nui/frontend/elements/impl/materialize.hpp
+++ b/nui/include/nui/frontend/elements/impl/materialize.hpp
@@ -44,8 +44,8 @@ namespace Nui
     };
     struct Renderer
     {
-        RendererType type;
-        std::size_t metadata;
+        RendererType type{RendererType::Append};
+        std::size_t metadata{0};
     };
     auto renderElement(Renderer const& gen, auto& element, auto const& htmlElement)
     {