diff --git a/src/backend/wayland/wl_backend.c b/src/backend/wayland/wl_backend.c
index 5ed8926..18b5333 100644
--- a/src/backend/wayland/wl_backend.c
+++ b/src/backend/wayland/wl_backend.c
@@ -94,6 +94,8 @@
 #include "../../WindowMaker.h"
 #include "../../screen.h"
 #include "../../window.h"
+#include "../../actions.h"     /* Phase 16: wMaximizeWindow, wIconifyWindow, etc. */
+#include "../../xinerama.h"    /* Phase 16: wGetHeadForWindow */
 #include "../../xmodifier.h"   /* Phase 77: wSetModifierMasks */
 #include "../../event.h"       /* Phase 78: wWaylandKeyPress */
 #include "../backend.h"
@@ -114,8 +116,12 @@ struct wl_toplevel_view {
     struct wl_listener       unmap_listener;
     struct wl_listener       destroy_listener;
     struct wl_listener       title_listener;    /* Phase 46: xdg_toplevel set_title */
-    struct wl_listener       request_move_listener;    /* Phase 15 */
-    struct wl_listener       request_resize_listener;  /* Phase 15 */
+    struct wl_listener       request_move_listener;      /* Phase 15 */
+    struct wl_listener       request_resize_listener;    /* Phase 15 */
+    struct wl_listener       request_maximize_listener;  /* Phase 16 */
+    struct wl_listener       request_fullscreen_listener;/* Phase 16 */
+    struct wl_listener       request_minimize_listener;  /* Phase 16 */
+    struct wl_listener       set_app_id_listener;        /* Phase 16 */
     WNativeWindow            id;           /* synthetic handle, >= 0x10000000 */
     int                      x, y;         /* Phase 55: WM-assigned position */
     long                    *wm_state;     /* Phase 56: saved WM state or NULL */
@@ -293,6 +299,76 @@ handle_toplevel_request_resize(struct wl_listener *listener, void *data)
     wwarning("wl_backend: request_resize id=0x%lx (no-op in headless mode)", view->id);
 }
 
+/*
+ * Phase 16: xdg_toplevel request_maximize — toggle maximize state.
+ */
+static void
+handle_toplevel_request_maximize(struct wl_listener *listener, void *data)
+{
+    struct wl_toplevel_view *view = VIEW_FROM_LISTENER(listener, request_maximize_listener);
+    (void)data;
+    WObjDescriptor *desc = wm_backend->context_find(view->id, WM_CTX_CLIENT_WIN);
+    if (!desc || desc->parent_type != WCLASS_WINDOW)
+        return;
+    WWindow *wwin = (WWindow *)desc->parent;
+    if (wwin->flags.maximized)
+        wUnmaximizeWindow(wwin);
+    else
+        wMaximizeWindow(wwin, MAX_VERTICAL | MAX_HORIZONTAL, wGetHeadForWindow(wwin));
+}
+
+/*
+ * Phase 16: xdg_toplevel request_fullscreen.
+ */
+static void
+handle_toplevel_request_fullscreen(struct wl_listener *listener, void *data)
+{
+    struct wl_toplevel_view *view = VIEW_FROM_LISTENER(listener, request_fullscreen_listener);
+    (void)data;
+    WObjDescriptor *desc = wm_backend->context_find(view->id, WM_CTX_CLIENT_WIN);
+    if (!desc || desc->parent_type != WCLASS_WINDOW)
+        return;
+    WWindow *wwin = (WWindow *)desc->parent;
+    if (!wwin->flags.fullscreen)
+        wFullscreenWindow(wwin);
+}
+
+/*
+ * Phase 16: xdg_toplevel request_minimize — iconify the window.
+ */
+static void
+handle_toplevel_request_minimize(struct wl_listener *listener, void *data)
+{
+    struct wl_toplevel_view *view = VIEW_FROM_LISTENER(listener, request_minimize_listener);
+    (void)data;
+    WObjDescriptor *desc = wm_backend->context_find(view->id, WM_CTX_CLIENT_WIN);
+    if (!desc || desc->parent_type != WCLASS_WINDOW)
+        return;
+    WWindow *wwin = (WWindow *)desc->parent;
+    if (!wwin->flags.miniaturized)
+        wIconifyWindow(wwin);
+}
+
+/*
+ * Phase 16: xdg_toplevel set_app_id — update wm_class.
+ */
+static void
+handle_toplevel_set_app_id(struct wl_listener *listener, void *data)
+{
+    struct wl_toplevel_view *view = VIEW_FROM_LISTENER(listener, set_app_id_listener);
+    (void)data;
+    WObjDescriptor *desc = wm_backend->context_find(view->id, WM_CTX_CLIENT_WIN);
+    if (!desc || desc->parent_type != WCLASS_WINDOW)
+        return;
+    WWindow *wwin = (WWindow *)desc->parent;
+    const char *app_id = view->xdg_surface->toplevel->app_id;
+    if (!app_id)
+        return;
+    if (wwin->wm_class)
+        wfree(wwin->wm_class);
+    wwin->wm_class = strdup(app_id);
+}
+
 /*
  * Phase 38: toplevel map — surface is ready to be managed.
  */
@@ -435,15 +511,23 @@ handle_xdg_new_surface(struct wl_listener *listener, void *data)
     view->unmap_listener.notify          = handle_toplevel_unmap;
     view->destroy_listener.notify        = handle_toplevel_destroy;
     view->title_listener.notify          = handle_toplevel_title;
-    view->request_move_listener.notify   = handle_toplevel_request_move;   /* Phase 15 */
-    view->request_resize_listener.notify = handle_toplevel_request_resize; /* Phase 15 */
+    view->request_move_listener.notify      = handle_toplevel_request_move;      /* Phase 15 */
+    view->request_resize_listener.notify    = handle_toplevel_request_resize;    /* Phase 15 */
+    view->request_maximize_listener.notify  = handle_toplevel_request_maximize;  /* Phase 16 */
+    view->request_fullscreen_listener.notify = handle_toplevel_request_fullscreen; /* Phase 16 */
+    view->request_minimize_listener.notify  = handle_toplevel_request_minimize;  /* Phase 16 */
+    view->set_app_id_listener.notify        = handle_toplevel_set_app_id;        /* Phase 16 */
 
-    wl_signal_add(&xdg_surface->events.map,                          &view->map_listener);
-    wl_signal_add(&xdg_surface->events.unmap,                        &view->unmap_listener);
-    wl_signal_add(&xdg_surface->events.destroy,                      &view->destroy_listener);
-    wl_signal_add(&xdg_surface->toplevel->events.set_title,          &view->title_listener);
-    wl_signal_add(&xdg_surface->toplevel->events.request_move,       &view->request_move_listener);
-    wl_signal_add(&xdg_surface->toplevel->events.request_resize,     &view->request_resize_listener);
+    wl_signal_add(&xdg_surface->events.map,                              &view->map_listener);
+    wl_signal_add(&xdg_surface->events.unmap,                            &view->unmap_listener);
+    wl_signal_add(&xdg_surface->events.destroy,                          &view->destroy_listener);
+    wl_signal_add(&xdg_surface->toplevel->events.set_title,              &view->title_listener);
+    wl_signal_add(&xdg_surface->toplevel->events.request_move,           &view->request_move_listener);
+    wl_signal_add(&xdg_surface->toplevel->events.request_resize,         &view->request_resize_listener);
+    wl_signal_add(&xdg_surface->toplevel->events.request_maximize,       &view->request_maximize_listener);
+    wl_signal_add(&xdg_surface->toplevel->events.request_fullscreen,     &view->request_fullscreen_listener);
+    wl_signal_add(&xdg_surface->toplevel->events.request_minimize,       &view->request_minimize_listener);
+    wl_signal_add(&xdg_surface->toplevel->events.set_app_id,             &view->set_app_id_listener);
 
     wl_list_insert(&wl_state.toplevel_list, &view->link);
     wl_state.managed_surface_count++;