diff --git a/xbanan/Base.cpp b/xbanan/Base.cpp
index 6bf0cc0..671cf88 100644
--- a/xbanan/Base.cpp
+++ b/xbanan/Base.cpp
@@ -445,6 +445,65 @@ void send_exposure_recursive(WINDOW wid)
 	MUST(window.send_event(event, ExposureMask));
 }
 
+struct PlatformWindowInfo
+{
+	PlatformWindow* transient_for;
+	WindowType type;
+};
+
+static PlatformWindowInfo get_plaform_window_info(const Object::Window& window)
+{
+	static const CARD32 ATOM                              = g_atoms_name_to_id["ATOM"_sv];
+	static const CARD32 WINDOW                            = g_atoms_name_to_id["WINDOW"_sv];
+	static const CARD32 WM_TRANSIENT_FOR                  = g_atoms_name_to_id["WM_TRANSIENT_FOR"_sv];
+	static const CARD32 _NET_WM_WINDOW_TYPE               = g_atoms_name_to_id["_NET_WM_WINDOW_TYPE"_sv];
+	static const CARD32 _NET_WM_WINDOW_TYPE_DIALOG        = g_atoms_name_to_id["_NET_WM_WINDOW_TYPE_DIALOG"_sv];
+	static const CARD32 _NET_WM_WINDOW_TYPE_NORMAL        = g_atoms_name_to_id["_NET_WM_WINDOW_TYPE_NORMAL"_sv];
+	static const CARD32 _NET_WM_WINDOW_TYPE_SPLASH        = g_atoms_name_to_id["_NET_WM_WINDOW_TYPE_SPLASH"_sv];
+	static const CARD32 _NET_WM_WINDOW_TYPE_UTILITY       = g_atoms_name_to_id["_NET_WM_WINDOW_TYPE_UTILITY"_sv];
+
+	PlatformWindowInfo info {
+		.transient_for = nullptr,
+		.type = WindowType::Normal,
+	};
+
+	if (auto it = window.properties.find(_NET_WM_WINDOW_TYPE); it != window.properties.end())
+	{
+		if (it->value.type != ATOM || it->value.data.size() != sizeof(CARD32))
+			goto wm_window_type_done;
+
+		const CARD32 type = *reinterpret_cast<const CARD32*>(it->value.data.data());
+		if (type == _NET_WM_WINDOW_TYPE_NORMAL)
+			info.type = WindowType::Normal;
+		else if (type == _NET_WM_WINDOW_TYPE_SPLASH || type == _NET_WM_WINDOW_TYPE_UTILITY || type == _NET_WM_WINDOW_TYPE_DIALOG)
+			info.type = WindowType::Utility;
+		else
+			info.type = WindowType::Popup;
+	}
+wm_window_type_done:
+
+	if (auto it = window.properties.find(WM_TRANSIENT_FOR); it != window.properties.end())
+	{
+		if (it->value.type != WINDOW || it->value.data.size() != sizeof(CARD32))
+			goto transitient_for_done;
+
+		const CARD32 wid = *reinterpret_cast<const CARD32*>(it->value.data.data());
+
+		auto it2 = g_objects.find(wid);
+		if (it2 == g_objects.end())
+			goto transitient_for_done;
+		if (it2->value->type != Object::Type::Window)
+			goto transitient_for_done;
+
+		// FIXME: support child windows
+		auto& window = it2->value->object.get<Object::Window>();
+		info.transient_for = window.platform_window.ptr();
+	}
+transitient_for_done:
+
+	return info;
+}
+
 static BAN::ErrorOr<void> map_window(Client& client_info, WINDOW wid)
 {
 	auto& object = *g_objects[wid];
@@ -457,7 +516,17 @@ static BAN::ErrorOr<void> map_window(Client& client_info, WINDOW wid)
 	if (window.parent == g_root.windowId)
 	{
 		ASSERT(!window.platform_window);
-		window.platform_window = TRY(g_platform_ops.create_window(wid, window.width, window.height));
+
+		auto info = get_plaform_window_info(window);
+		window.platform_window = TRY(g_platform_ops.create_window(
+			info.transient_for,
+			info.type,
+			wid,
+			window.x,
+			window.y,
+			window.width,
+			window.height
+		));
 	}
 
 	window.mapped = true;
diff --git a/xbanan/Platform.h b/xbanan/Platform.h
index b73e692..fe7cb88 100644
--- a/xbanan/Platform.h
+++ b/xbanan/Platform.h
@@ -9,6 +9,13 @@ struct PlatformWindow
 	virtual ~PlatformWindow() = default;
 };
 
+enum class WindowType
+{
+	Popup,
+	Normal,
+	Utility,
+};
+
 // initialize, poll_events, create_window and invalidate are required
 struct PlatformOps
 {
@@ -17,7 +24,7 @@ struct PlatformOps
 	/* Handle pending events */
 	void (*poll_events)(void*);
 	/* Create a window with given size */
-	BAN::ErrorOr<BAN::UniqPtr<PlatformWindow>> (*create_window)(WINDOW wid, uint32_t width, uint32_t height);
+	BAN::ErrorOr<BAN::UniqPtr<PlatformWindow>> (*create_window)(PlatformWindow* parent, WindowType, WINDOW wid, int32_t x, int32_t y, uint32_t width, uint32_t height);
 	/* Invaldate part of a window */
 	void (*invalidate)(PlatformWindow*, const uint32_t* pixels, uint32_t x, uint32_t y, uint32_t width, uint32_t height);
 	/* Request resize of a window, can be async */
diff --git a/xbanan/SDL2/sdl2.cpp b/xbanan/SDL2/sdl2.cpp
index 023c182..50eaa1b 100644
--- a/xbanan/SDL2/sdl2.cpp
+++ b/xbanan/SDL2/sdl2.cpp
@@ -92,26 +92,7 @@ static bool sdl2_initialize(uint32_t* display_w, uint32_t* display_h)
 	return true;
 }
 
-static bool sdl2_init_window(SDLWindow& window, uint32_t width, uint32_t height)
-{
-	window.renderer = SDL_CreateRenderer(window.window, -1, SDL_RENDERER_ACCELERATED);
-	if (window.renderer == nullptr)
-	{
-		dwarnln("Could not create SDL renderer: {}\n", SDL_GetError());
-		return false;
-	}
-
-	window.texture = SDL_CreateTexture(window.renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, width, height);
-	if (window.texture == nullptr)
-	{
-		dwarnln("Could not create SDL texture: {}\n", SDL_GetError());
-		return false;
-	}
-
-	return true;
-}
-
-static BAN::ErrorOr<BAN::UniqPtr<PlatformWindow>> sdl2_create_window(WINDOW wid, uint32_t width, uint32_t height)
+static BAN::ErrorOr<BAN::UniqPtr<PlatformWindow>> sdl2_create_window(PlatformWindow* parent, WindowType type, WINDOW wid, int32_t x, int32_t y, uint32_t width, uint32_t height)
 {
 	auto window = TRY(BAN::UniqPtr<SDLWindow>::create());
 
@@ -119,16 +100,51 @@ static BAN::ErrorOr<BAN::UniqPtr<PlatformWindow>> sdl2_create_window(WINDOW wid,
 	window->width = width;
 	window->height = height;
 
-	const auto flags = SDL_WINDOW_RESIZABLE | SDL_WINDOW_UTILITY;
-	window->window = SDL_CreateWindow("", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, width, height, flags);
+	if (parent == nullptr)
+		x = y = SDL_WINDOWPOS_UNDEFINED;
+	else
+	{
+		auto& sdl_parent = *static_cast<SDLWindow*>(parent);
+		int parent_x, parent_y;
+		SDL_GetWindowPosition(sdl_parent.window, &parent_x, &parent_y);
+		x += parent_x;
+		y += parent_y;
+	}
+
+	int flags;
+	switch (type)
+	{
+		case WindowType::Popup:
+			flags = SDL_WINDOW_BORDERLESS | SDL_WINDOW_ALWAYS_ON_TOP | SDL_WINDOW_SKIP_TASKBAR | SDL_WINDOW_UTILITY;
+			break;
+		case WindowType::Utility:
+			flags = SDL_WINDOW_RESIZABLE | SDL_WINDOW_UTILITY;
+			break;
+		case WindowType::Normal:
+			flags = SDL_WINDOW_RESIZABLE;
+			break;
+	}
+
+	window->window = SDL_CreateWindow("", x, y, width, height, flags);
 	if (window->window == nullptr)
 	{
 		dwarnln("Could not create SDL window: {}", SDL_GetError());
 		return BAN::Error::from_errno(EFAULT);
 	}
 
-	if (!sdl2_init_window(*window, width, height))
+	window->renderer = SDL_CreateRenderer(window->window, -1, SDL_RENDERER_ACCELERATED);
+	if (window->renderer == nullptr)
+	{
+		dwarnln("Could not create SDL renderer: {}", SDL_GetError());
 		return BAN::Error::from_errno(EFAULT);
+	}
+
+	window->texture = SDL_CreateTexture(window->renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, width, height);
+	if (window->texture == nullptr)
+	{
+		dwarnln("Could not create SDL texture: {}", SDL_GetError());
+		return BAN::Error::from_errno(EFAULT);
+	}
 
 	TRY(s_window_map.insert(SDL_GetWindowID(window->window), window.ptr()));
 
diff --git a/xbanan/banan-os/banan-os.cpp b/xbanan/banan-os/banan-os.cpp
index d0d222b..5fa0c4b 100644
--- a/xbanan/banan-os/banan-os.cpp
+++ b/xbanan/banan-os/banan-os.cpp
@@ -38,8 +38,13 @@ static void bananos_poll_events(void* window)
 	banan_window.window->poll_events();
 }
 
-static BAN::ErrorOr<BAN::UniqPtr<PlatformWindow>> bananos_create_window(WINDOW wid, uint32_t width, uint32_t height)
+static BAN::ErrorOr<BAN::UniqPtr<PlatformWindow>> bananos_create_window(PlatformWindow* parent, WindowType type, WINDOW wid, int32_t x, int32_t y, uint32_t width, uint32_t height)
 {
+	(void)parent;
+	(void)type;
+	(void)x;
+	(void)y;
+
 	auto window = TRY(BAN::UniqPtr<BananWindow>::create());
 
 	auto attributes = LibGUI::Window::default_attributes;
diff --git a/xbanan/main.cpp b/xbanan/main.cpp
index b630666..7cb565b 100644
--- a/xbanan/main.cpp
+++ b/xbanan/main.cpp
@@ -252,6 +252,11 @@ int main()
 	APPEND_ATOM_CUSTOM(WM_DELETE_WINDOW);
 	APPEND_ATOM_CUSTOM(_NET_WM_STATE);
 	APPEND_ATOM_CUSTOM(_NET_WM_STATE_FULLSCREEN);
+	APPEND_ATOM_CUSTOM(_NET_WM_WINDOW_TYPE);
+	APPEND_ATOM_CUSTOM(_NET_WM_WINDOW_TYPE_DIALOG);
+	APPEND_ATOM_CUSTOM(_NET_WM_WINDOW_TYPE_NORMAL);
+	APPEND_ATOM_CUSTOM(_NET_WM_WINDOW_TYPE_SPLASH);
+	APPEND_ATOM_CUSTOM(_NET_WM_WINDOW_TYPE_UTILITY);
 #undef APPEND_ATOM_CUSTOM
 
 	MUST(initialize_keymap());