diff --git a/misc/scripts/install_accesskit.py b/misc/scripts/install_accesskit.py
index 41bb7a7706..b6b3e00284 100755
--- a/misc/scripts/install_accesskit.py
+++ b/misc/scripts/install_accesskit.py
@@ -20,7 +20,7 @@ else:
     deps_folder = os.path.join("bin", "build_deps")
 
 # AccessKit
-ac_version = "0.21.2"
+ac_version = "0.22.3"
 
 # Create dependencies folder
 if not os.path.exists(deps_folder):
diff --git a/thirdparty/README.md b/thirdparty/README.md
index c5aeaf4825..38469b6863 100644
--- a/thirdparty/README.md
+++ b/thirdparty/README.md
@@ -8,7 +8,7 @@ readability.
 ## accesskit
 
 - Upstream: https://github.com/AccessKit/accesskit-c
-- Version: 0.21.2 (72460cd52d1b24492393cdf54a6f19d2fd63e258, 2026)
+- Version: 0.22.3 (826d672661f9453c8b269ab3946dbcbae6300555, 2026)
 - License: MIT
 
 Files extracted from upstream source:
diff --git a/thirdparty/accesskit/include/accesskit.h b/thirdparty/accesskit/include/accesskit.h
index eab9e35370..fb0af1ddf7 100644
--- a/thirdparty/accesskit/include/accesskit.h
+++ b/thirdparty/accesskit/include/accesskit.h
@@ -19,6 +19,44 @@
 #ifdef __ANDROID__
 #include <jni.h>
 #endif
+#ifdef __APPLE__
+#include <TargetConditionals.h>
+/* Older SDKs may not define all of these; force them to 0 so the
+   value-based checks below are safe. */
+#ifndef TARGET_OS_OSX
+#define TARGET_OS_OSX 0
+#endif
+#ifndef TARGET_OS_IOS
+#define TARGET_OS_IOS 0
+#endif
+#ifndef TARGET_OS_TV
+#define TARGET_OS_TV 0
+#endif
+#ifndef TARGET_OS_WATCH
+#define TARGET_OS_WATCH 0
+#endif
+#ifndef TARGET_OS_VISION
+#define TARGET_OS_VISION 0
+#endif
+#ifndef TARGET_OS_MACCATALYST
+#define TARGET_OS_MACCATALYST 0
+#endif
+#if TARGET_OS_OSX
+#define ACCESSKIT_MACOS
+#endif
+#if TARGET_OS_IOS || TARGET_OS_MACCATALYST
+#define ACCESSKIT_IOS
+#endif
+#if TARGET_OS_TV
+#define ACCESSKIT_TVOS
+#endif
+#if TARGET_OS_WATCH
+#define ACCESSKIT_WATCHOS
+#endif
+#if TARGET_OS_VISION
+#define ACCESSKIT_VISIONOS
+#endif
+#endif /* __APPLE__ */
 
 /**
  * An action to be taken on an accessibility node.
@@ -592,15 +630,31 @@ typedef struct accesskit_android_queued_events accesskit_android_queued_events;
 
 typedef struct accesskit_custom_action accesskit_custom_action;
 
-#if defined(__APPLE__)
+#if (defined(ACCESSKIT_IOS) || defined(ACCESSKIT_TVOS) || \
+     defined(ACCESSKIT_VISIONOS) || defined(ACCESSKIT_WATCHOS))
+typedef struct accesskit_ios_adapter accesskit_ios_adapter;
+#endif
+
+#if (defined(ACCESSKIT_IOS) || defined(ACCESSKIT_TVOS) || \
+     defined(ACCESSKIT_VISIONOS) || defined(ACCESSKIT_WATCHOS))
+typedef struct accesskit_ios_queued_events accesskit_ios_queued_events;
+#endif
+
+#if (defined(ACCESSKIT_IOS) || defined(ACCESSKIT_TVOS) || \
+     defined(ACCESSKIT_VISIONOS) || defined(ACCESSKIT_WATCHOS))
+typedef struct accesskit_ios_subclassing_adapter
+    accesskit_ios_subclassing_adapter;
+#endif
+
+#if defined(ACCESSKIT_MACOS)
 typedef struct accesskit_macos_adapter accesskit_macos_adapter;
 #endif
 
-#if defined(__APPLE__)
+#if defined(ACCESSKIT_MACOS)
 typedef struct accesskit_macos_queued_events accesskit_macos_queued_events;
 #endif
 
-#if defined(__APPLE__)
+#if defined(ACCESSKIT_MACOS)
 typedef struct accesskit_macos_subclassing_adapter
     accesskit_macos_subclassing_adapter;
 #endif
@@ -2561,7 +2615,167 @@ void accesskit_android_injecting_adapter_update_if_active(
     void *update_factory_userdata);
 #endif
 
-#if defined(__APPLE__)
+#if (defined(ACCESSKIT_IOS) || defined(ACCESSKIT_TVOS) || \
+     defined(ACCESSKIT_VISIONOS) || defined(ACCESSKIT_WATCHOS))
+/**
+ * Memory is also freed when calling this function.
+ */
+void accesskit_ios_queued_events_raise(
+    struct accesskit_ios_queued_events *events);
+#endif
+
+#if (defined(ACCESSKIT_IOS) || defined(ACCESSKIT_TVOS) || \
+     defined(ACCESSKIT_VISIONOS) || defined(ACCESSKIT_WATCHOS))
+/**
+ * This function must be called on the main thread.
+ * All handlers will always be called on the main thread.
+ *
+ * # Safety
+ *
+ * `view` must be a valid, unreleased pointer to a `UIView`.
+ */
+struct accesskit_ios_adapter *accesskit_ios_adapter_new(
+    void *view, accesskit_activation_handler_callback activation_handler,
+    void *activation_handler_userdata,
+    accesskit_action_handler_callback action_handler,
+    void *action_handler_userdata,
+    accesskit_deactivation_handler_callback deactivation_handler,
+    void *deactivation_handler_userdata);
+#endif
+
+#if (defined(ACCESSKIT_IOS) || defined(ACCESSKIT_TVOS) || \
+     defined(ACCESSKIT_VISIONOS) || defined(ACCESSKIT_WATCHOS))
+void accesskit_ios_adapter_free(struct accesskit_ios_adapter *adapter);
+#endif
+
+#if (defined(ACCESSKIT_IOS) || defined(ACCESSKIT_TVOS) || \
+     defined(ACCESSKIT_VISIONOS) || defined(ACCESSKIT_WATCHOS))
+/**
+ * You must call `accesskit_ios_queued_events_raise` on the returned pointer. It
+ * can be null if the adapter is not active.
+ */
+struct accesskit_ios_queued_events *accesskit_ios_adapter_update_if_active(
+    struct accesskit_ios_adapter *adapter,
+    accesskit_tree_update_factory update_factory,
+    void *update_factory_userdata);
+#endif
+
+#if (defined(ACCESSKIT_IOS) || defined(ACCESSKIT_TVOS) || \
+     defined(ACCESSKIT_VISIONOS) || defined(ACCESSKIT_WATCHOS))
+/**
+ * Call this when the host view has just appeared on screen. If an
+ * assistive technology is running, this proactively builds the
+ * accessibility tree.
+ *
+ * You must call `accesskit_ios_queued_events_raise` on the returned pointer. It
+ * can be null if the adapter is not active.
+ */
+struct accesskit_ios_queued_events *accesskit_ios_adapter_view_did_appear(
+    struct accesskit_ios_adapter *adapter);
+#endif
+
+#if (defined(ACCESSKIT_IOS) || defined(ACCESSKIT_TVOS) || \
+     defined(ACCESSKIT_VISIONOS) || defined(ACCESSKIT_WATCHOS))
+/**
+ * Returns whether the view itself is an accessibility element.
+ * This corresponds to `isAccessibilityElement`.
+ */
+bool accesskit_ios_adapter_is_accessibility_element(
+    struct accesskit_ios_adapter *adapter);
+#endif
+
+#if (defined(ACCESSKIT_IOS) || defined(ACCESSKIT_TVOS) || \
+     defined(ACCESSKIT_VISIONOS) || defined(ACCESSKIT_WATCHOS))
+/**
+ * Returns a pointer to an `NSArray` of accessibility elements
+ * contained in the view. Ownership of the pointer is not transferred.
+ * This corresponds to `accessibilityElements`.
+ */
+void *accesskit_ios_adapter_accessibility_elements(
+    struct accesskit_ios_adapter *adapter);
+#endif
+
+#if (defined(ACCESSKIT_IOS) || defined(ACCESSKIT_TVOS) || \
+     defined(ACCESSKIT_VISIONOS) || defined(ACCESSKIT_WATCHOS))
+/**
+ * Returns a pointer to the accessibility element at the specified point,
+ * or null if none. Ownership of the pointer is not transferred.
+ * This corresponds to `accessibilityHitTest:`.
+ */
+void *accesskit_ios_adapter_hit_test(struct accesskit_ios_adapter *adapter,
+                                     double x, double y);
+#endif
+
+#if (defined(ACCESSKIT_IOS) || defined(ACCESSKIT_TVOS) || \
+     defined(ACCESSKIT_VISIONOS) || defined(ACCESSKIT_WATCHOS))
+/**
+ * Caller must call `accesskit_string_free` with the return value.
+ */
+char *accesskit_ios_adapter_debug(const struct accesskit_ios_adapter *adapter);
+#endif
+
+#if (defined(ACCESSKIT_IOS) || defined(ACCESSKIT_TVOS) || \
+     defined(ACCESSKIT_VISIONOS) || defined(ACCESSKIT_WATCHOS))
+/**
+ * All handlers will always be called on the main thread.
+ *
+ * # Safety
+ *
+ * `view` must be a valid, unreleased pointer to a `UIView`.
+ */
+struct accesskit_ios_subclassing_adapter *accesskit_ios_subclassing_adapter_new(
+    void *view, accesskit_activation_handler_callback activation_handler,
+    void *activation_handler_userdata,
+    accesskit_action_handler_callback action_handler,
+    void *action_handler_userdata,
+    accesskit_deactivation_handler_callback deactivation_handler,
+    void *deactivation_handler_userdata);
+#endif
+
+#if (defined(ACCESSKIT_IOS) || defined(ACCESSKIT_TVOS) || \
+     defined(ACCESSKIT_VISIONOS) || defined(ACCESSKIT_WATCHOS))
+/**
+ * All handlers will always be called on the main thread.
+ *
+ * # Safety
+ *
+ * `window` must be a valid, unreleased pointer to a `UIWindow`.
+ *
+ * # Panics
+ *
+ * This function panics if the specified window doesn't currently have
+ * a root view controller with a view.
+ */
+struct accesskit_ios_subclassing_adapter *
+accesskit_ios_subclassing_adapter_for_window(
+    void *window, accesskit_activation_handler_callback activation_handler,
+    void *activation_handler_userdata,
+    accesskit_action_handler_callback action_handler,
+    void *action_handler_userdata,
+    accesskit_deactivation_handler_callback deactivation_handler,
+    void *deactivation_handler_userdata);
+#endif
+
+#if (defined(ACCESSKIT_IOS) || defined(ACCESSKIT_TVOS) || \
+     defined(ACCESSKIT_VISIONOS) || defined(ACCESSKIT_WATCHOS))
+void accesskit_ios_subclassing_adapter_free(
+    struct accesskit_ios_subclassing_adapter *adapter);
+#endif
+
+#if (defined(ACCESSKIT_IOS) || defined(ACCESSKIT_TVOS) || \
+     defined(ACCESSKIT_VISIONOS) || defined(ACCESSKIT_WATCHOS))
+/**
+ * You must call `accesskit_ios_queued_events_raise` on the returned pointer. It
+ * can be null if the adapter is not active.
+ */
+struct accesskit_ios_queued_events *
+accesskit_ios_subclassing_adapter_update_if_active(
+    struct accesskit_ios_subclassing_adapter *adapter,
+    accesskit_tree_update_factory update_factory,
+    void *update_factory_userdata);
+#endif
+
+#if defined(ACCESSKIT_MACOS)
 /**
  * Memory is also freed when calling this function.
  */
@@ -2569,7 +2783,7 @@ void accesskit_macos_queued_events_raise(
     struct accesskit_macos_queued_events *events);
 #endif
 
-#if defined(__APPLE__)
+#if defined(ACCESSKIT_MACOS)
 /**
  * # Safety
  *
@@ -2581,11 +2795,11 @@ struct accesskit_macos_adapter *accesskit_macos_adapter_new(
     void *action_handler_userdata);
 #endif
 
-#if defined(__APPLE__)
+#if defined(ACCESSKIT_MACOS)
 void accesskit_macos_adapter_free(struct accesskit_macos_adapter *adapter);
 #endif
 
-#if defined(__APPLE__)
+#if defined(ACCESSKIT_MACOS)
 /**
  * You must call `accesskit_macos_queued_events_raise` on the returned pointer.
  * It can be null if the adapter is not active.
@@ -2596,7 +2810,7 @@ struct accesskit_macos_queued_events *accesskit_macos_adapter_update_if_active(
     void *update_factory_userdata);
 #endif
 
-#if defined(__APPLE__)
+#if defined(ACCESSKIT_MACOS)
 /**
  * Update the tree state based on whether the window is focused.
  *
@@ -2608,7 +2822,7 @@ accesskit_macos_adapter_update_view_focus_state(
     struct accesskit_macos_adapter *adapter, bool is_focused);
 #endif
 
-#if defined(__APPLE__)
+#if defined(ACCESSKIT_MACOS)
 /**
  * Returns a pointer to an `NSArray`. Ownership of the pointer is not
  * transferred.
@@ -2619,7 +2833,7 @@ void *accesskit_macos_adapter_view_children(
     void *activation_handler_userdata);
 #endif
 
-#if defined(__APPLE__)
+#if defined(ACCESSKIT_MACOS)
 /**
  * Returns a pointer to an `NSObject`. Ownership of the pointer is not
  * transferred.
@@ -2630,7 +2844,7 @@ void *accesskit_macos_adapter_focus(
     void *activation_handler_userdata);
 #endif
 
-#if defined(__APPLE__)
+#if defined(ACCESSKIT_MACOS)
 /**
  * Returns a pointer to an `NSObject`. Ownership of the pointer is not
  * transferred.
@@ -2641,7 +2855,7 @@ void *accesskit_macos_adapter_hit_test(
     void *activation_handler_userdata);
 #endif
 
-#if defined(__APPLE__)
+#if defined(ACCESSKIT_MACOS)
 /**
  * Caller must call `accesskit_string_free` with the return value.
  */
@@ -2649,7 +2863,7 @@ char *accesskit_macos_adapter_debug(
     const struct accesskit_macos_adapter *adapter);
 #endif
 
-#if defined(__APPLE__)
+#if defined(ACCESSKIT_MACOS)
 /**
  * # Safety
  *
@@ -2663,7 +2877,7 @@ accesskit_macos_subclassing_adapter_new(
     void *action_handler_userdata);
 #endif
 
-#if defined(__APPLE__)
+#if defined(ACCESSKIT_MACOS)
 /**
  * # Safety
  *
@@ -2682,12 +2896,12 @@ accesskit_macos_subclassing_adapter_for_window(
     void *action_handler_userdata);
 #endif
 
-#if defined(__APPLE__)
+#if defined(ACCESSKIT_MACOS)
 void accesskit_macos_subclassing_adapter_free(
     struct accesskit_macos_subclassing_adapter *adapter);
 #endif
 
-#if defined(__APPLE__)
+#if defined(ACCESSKIT_MACOS)
 /**
  * You must call `accesskit_macos_queued_events_raise` on the returned pointer.
  * It can be null if the adapter is not active.
@@ -2699,7 +2913,7 @@ accesskit_macos_subclassing_adapter_update_if_active(
     void *update_factory_userdata);
 #endif
 
-#if defined(__APPLE__)
+#if defined(ACCESSKIT_MACOS)
 /**
  * Update the tree state based on whether the window is focused.
  *
@@ -2711,7 +2925,7 @@ accesskit_macos_subclassing_adapter_update_view_focus_state(
     struct accesskit_macos_subclassing_adapter *adapter, bool is_focused);
 #endif
 
-#if defined(__APPLE__)
+#if defined(ACCESSKIT_MACOS)
 /**
  * Modifies the specified class, which must be a subclass of `NSWindow`,
  * to include an `accessibilityFocusedUIElement` method that calls
@@ -2732,7 +2946,7 @@ void accesskit_macos_add_focus_forwarder_to_window_class(
     const char *class_name);
 #endif
 
-#if defined(__APPLE__)
+#if defined(ACCESSKIT_MACOS)
 /**
  * Modifies the specified class, which must be a subclass of `NSWindow`,
  * to include an `accessibilityFocusedUIElement` method that calls