diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 9bf3acb0..571c9586 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -42,6 +42,7 @@ jobs:
     - run: nim c examples/fixedsize.nim
     - run: nim c examples/fullscreen.nim
     - run: nim c examples/icon.nim
+    - run: nim c examples/mouse_inside.nim
     - run: nim c examples/opengl_version.nim
     - run: nim c examples/openurl.nim
     - run: nim c examples/property_changes.nim
@@ -82,6 +83,8 @@ jobs:
       if: matrix.os == 'ubuntu-latest'
     - run: nim c -d:emscripten examples/icon.nim
       if: matrix.os == 'ubuntu-latest'
+    - run: nim c -d:emscripten examples/mouse_inside.nim
+      if: matrix.os == 'ubuntu-latest'
     - run: nim c -d:emscripten examples/opengl_version.nim
       if: matrix.os == 'ubuntu-latest'
     - run: nim c -d:emscripten examples/openurl.nim
diff --git a/examples/mouse_inside.nim b/examples/mouse_inside.nim
new file mode 100644
index 00000000..057e65ac
--- /dev/null
+++ b/examples/mouse_inside.nim
@@ -0,0 +1,29 @@
+import opengl, os, windy
+
+let window = newWindow("Windy Mouse Inside", ivec2(1280, 800))
+
+window.makeContextCurrent()
+loadExtensions()
+
+var wasInside = window.mouseInside
+
+echo "Move the mouse in and out of the window."
+echo "Red means inside, black means outside."
+echo "mouseInside ", wasInside
+
+window.onFrame = proc() =
+  let inside = window.mouseInside
+  if inside != wasInside:
+    echo "mouseInside ", inside
+    wasInside = inside
+  if inside:
+    glClearColor(1.0f, 0.0f, 0.0f, 1.0f)
+  else:
+    glClearColor(0.0f, 0.0f, 0.0f, 1.0f)
+  glClear(GL_COLOR_BUFFER_BIT)
+  window.swapBuffers()
+
+while not window.closeRequested:
+  if window.minimized or not window.visible:
+    sleep(10)
+  pollEvents()
diff --git a/src/windy/internal.nim b/src/windy/internal.nim
index ae38e094..44dffedd 100644
--- a/src/windy/internal.nim
+++ b/src/windy/internal.nim
@@ -12,6 +12,7 @@ type
     closeRequested*, closed*: bool
     hasPrevMouse*: bool
     mouseCaptured*: bool
+    mouseInside*: bool
     mousePos*, mousePrevPos*: IVec2
     buttonDown*, buttonToggle*: set[Button]
     perFrame*: PerFrame
diff --git a/src/windy/platforms/emscripten/emdefs.nim b/src/windy/platforms/emscripten/emdefs.nim
index a84a68f6..2a3212fd 100644
--- a/src/windy/platforms/emscripten/emdefs.nim
+++ b/src/windy/platforms/emscripten/emdefs.nim
@@ -425,6 +425,8 @@ type
 proc emscripten_set_mousedown_callback_on_thread*(target: cstring, userData: pointer, useCapture: EM_BOOL, callback: EmscriptenMouseEventCallback, targetThread: pointer): EMSCRIPTEN_RESULT {.importc, header: "<emscripten/html5.h>".}
 proc emscripten_set_mouseup_callback_on_thread*(target: cstring, userData: pointer, useCapture: EM_BOOL, callback: EmscriptenMouseEventCallback, targetThread: pointer): EMSCRIPTEN_RESULT {.importc, header: "<emscripten/html5.h>".}
 proc emscripten_set_mousemove_callback_on_thread*(target: cstring, userData: pointer, useCapture: EM_BOOL, callback: EmscriptenMouseEventCallback, targetThread: pointer): EMSCRIPTEN_RESULT {.importc, header: "<emscripten/html5.h>".}
+proc emscripten_set_mouseenter_callback_on_thread*(target: cstring, userData: pointer, useCapture: EM_BOOL, callback: EmscriptenMouseEventCallback, targetThread: pointer): EMSCRIPTEN_RESULT {.importc, header: "<emscripten/html5.h>".}
+proc emscripten_set_mouseleave_callback_on_thread*(target: cstring, userData: pointer, useCapture: EM_BOOL, callback: EmscriptenMouseEventCallback, targetThread: pointer): EMSCRIPTEN_RESULT {.importc, header: "<emscripten/html5.h>".}
 proc emscripten_set_wheel_callback_on_thread*(target: cstring, userData: pointer, useCapture: EM_BOOL, callback: EmscriptenWheelEventCallback, targetThread: pointer): EMSCRIPTEN_RESULT {.importc, header: "<emscripten/html5.h>".}
 proc emscripten_set_keydown_callback_on_thread*(target: cstring, userData: pointer, useCapture: EM_BOOL, callback: EmscriptenKeyboardEventCallback, targetThread: pointer): EMSCRIPTEN_RESULT {.importc, header: "<emscripten/html5.h>".}
 proc emscripten_set_keyup_callback_on_thread*(target: cstring, userData: pointer, useCapture: EM_BOOL, callback: EmscriptenKeyboardEventCallback, targetThread: pointer): EMSCRIPTEN_RESULT {.importc, header: "<emscripten/html5.h>".}
diff --git a/src/windy/platforms/emscripten/platform.nim b/src/windy/platforms/emscripten/platform.nim
index b0afc77a..ec8b7942 100644
--- a/src/windy/platforms/emscripten/platform.nim
+++ b/src/windy/platforms/emscripten/platform.nim
@@ -325,6 +325,10 @@ proc newWindow*(
 proc mousePos*(window: Window): IVec2 =
   (window.state.mousePos.vec2 * window.contentScale).ivec2
 
+proc mouseInside*(window: Window): bool =
+  ## True while the cursor is over this window's content.
+  window.state.mouseInside
+
 proc mousePrevPos*(window: Window): IVec2 =
   (window.state.mousePrevPos.vec2 * window.contentScale).ivec2
 
@@ -618,11 +622,22 @@ proc onMouseMove(eventType: cint, mouseEvent: ptr EmscriptenMouseEvent, userData
   window.state.mousePrevPos = window.state.mousePos
   # Use clientX/clientY as they are more reliably populated
   window.state.mousePos = ivec2(mouseEvent.clientX.int32, mouseEvent.clientY.int32)
+  window.state.mouseInside = true
   window.state.perFrame.mouseDelta += window.state.mousePos - window.state.mousePrevPos
   if window.onMouseMove != nil:
     window.onMouseMove()
   return 1
 
+proc onMouseEnter(eventType: cint, mouseEvent: ptr EmscriptenMouseEvent, userData: pointer): EM_BOOL {.cdecl.} =
+  let window = cast[Window](userData)
+  window.state.mouseInside = true
+  return 1
+
+proc onMouseLeave(eventType: cint, mouseEvent: ptr EmscriptenMouseEvent, userData: pointer): EM_BOOL {.cdecl.} =
+  let window = cast[Window](userData)
+  window.state.mouseInside = false
+  return 1
+
 proc onWheel(eventType: cint, wheelEvent: ptr EmscriptenWheelEvent, userData: pointer): EM_BOOL {.cdecl.} =
   ## Handle browser wheel events with OS-specific normalization.
   let window = cast[Window](userData)
@@ -707,6 +722,8 @@ proc setupEventHandlers(window: Window) =
   discard emscripten_set_mousedown_callback_on_thread(window.canvas, cast[pointer](window), 1, onMouseDown, EM_CALLBACK_THREAD_CONTEXT)
   discard emscripten_set_mouseup_callback_on_thread(window.canvas, cast[pointer](window), 1, onMouseUp, EM_CALLBACK_THREAD_CONTEXT)
   discard emscripten_set_mousemove_callback_on_thread(window.canvas, cast[pointer](window), 1, onMouseMove, EM_CALLBACK_THREAD_CONTEXT)
+  discard emscripten_set_mouseenter_callback_on_thread(window.canvas, cast[pointer](window), 1, onMouseEnter, EM_CALLBACK_THREAD_CONTEXT)
+  discard emscripten_set_mouseleave_callback_on_thread(window.canvas, cast[pointer](window), 1, onMouseLeave, EM_CALLBACK_THREAD_CONTEXT)
 
   # Wheel event
   discard emscripten_set_wheel_callback_on_thread(window.canvas, cast[pointer](window), 1, onWheel, EM_CALLBACK_THREAD_CONTEXT)
diff --git a/src/windy/platforms/linux/x11.nim b/src/windy/platforms/linux/x11.nim
index 5f84b366..f9aeeca7 100644
--- a/src/windy/platforms/linux/x11.nim
+++ b/src/windy/platforms/linux/x11.nim
@@ -1038,6 +1038,7 @@ proc pollEvents(window: Window) =
     of xeMotion:
       window.mousePrevPos = window.mousePos
       window.mousePos = ev.motion.pos
+      window.state.mouseInside = true
       window.perFrame.mouseDelta += window.mousePos - window.mousePrevPos
       if (window.mousePos - window.lastClickPosition).vec2.length > multiClickRadius:
         window.buttonClicking = {}
@@ -1045,6 +1046,13 @@ proc pollEvents(window: Window) =
       if window.onMouseMove != nil:
         window.onMouseMove()
 
+    of xeEnter:
+      if ev.crossing.mode == 0:
+        window.state.mouseInside = true
+    of xeLeave:
+      if ev.crossing.mode == 0:
+        window.state.mouseInside = false
+
     of xeButtonPress, xeButtonRelease:
 
       template pushScrollEvent(delta: Vec2) =
@@ -1151,6 +1159,10 @@ proc pollEvents(window: Window) =
 proc mousePos*(window: Window): IVec2 =
   window.mousePos
 
+proc mouseInside*(window: Window): bool =
+  ## True while the cursor is over this window's content.
+  window.state.mouseInside
+
 proc mousePrevPos*(window: Window): IVec2 =
   window.mousePrevPos
 
diff --git a/src/windy/platforms/macos/platform.nim b/src/windy/platforms/macos/platform.nim
index 0b86d90d..89cd437c 100644
--- a/src/windy/platforms/macos/platform.nim
+++ b/src/windy/platforms/macos/platform.nim
@@ -325,6 +325,7 @@ proc handleMouseMove(window: Window, location: NSPoint) =
 
   window.state.mousePrevPos = window.state.mousePos
   window.state.mousePos = (vec2(x, y) * window.contentScale).ivec2
+  window.state.mouseInside = true
 
   # Prevent a jump in the mouse delta when focusing a window.
   if window.state.hasPrevMouse:
@@ -615,6 +616,20 @@ proc updateTrackingAreas(self: ID, cmd: SEL): ID {.cdecl.} =
 
   callSuper(self, cmd)
 
+proc mouseEntered(self: ID, cmd: SEL, event: NSEvent): ID {.cdecl.} =
+  let window = windows.forNSWindow(self.NSView.window)
+  if window == nil:
+    return
+  window.state.mouseInside = true
+  if not window.state.mouseCaptured:
+    handleMouseMove(window, event.locationInWindow)
+
+proc mouseExited(self: ID, cmd: SEL, event: NSEvent): ID {.cdecl.} =
+  let window = windows.forNSWindow(self.NSView.window)
+  if window == nil:
+    return
+  window.state.mouseInside = false
+
 proc mouseMoved(self: ID, cmd: SEL, event: NSEvent): ID {.cdecl.} =
   let window = windows.forNSWindow(self.NSView.window)
   if window == nil:
@@ -978,6 +993,8 @@ proc init() {.raises: [].} =
         addMethod "acceptsFirstMouse:", acceptsFirstMouse
         addMethod "viewDidChangeBackingProperties", viewDidChangeBackingProperties
         addMethod "updateTrackingAreas", updateTrackingAreas
+        addMethod "mouseEntered:", mouseEntered
+        addMethod "mouseExited:", mouseExited
         addMethod "mouseMoved:", mouseMoved
         addMethod "mouseDragged:", mouseDragged
         addMethod "rightMouseDragged:", rightMouseDragged
@@ -1013,6 +1030,8 @@ proc init() {.raises: [].} =
         addMethod "acceptsFirstMouse:", acceptsFirstMouse
         addMethod "viewDidChangeBackingProperties", viewDidChangeBackingProperties
         addMethod "updateTrackingAreas", updateTrackingAreas
+        addMethod "mouseEntered:", mouseEntered
+        addMethod "mouseExited:", mouseExited
         addMethod "mouseMoved:", mouseMoved
         addMethod "mouseDragged:", mouseDragged
         addMethod "rightMouseDragged:", rightMouseDragged
@@ -1338,6 +1357,10 @@ proc nativeView*(window: Window): NSView =
 proc mousePos*(window: Window): IVec2 =
   window.state.mousePos
 
+proc mouseInside*(window: Window): bool =
+  ## True while the cursor is over this window's content.
+  window.state.mouseInside
+
 proc mousePrevPos*(window: Window): IVec2 =
   window.state.mousePrevPos
 
diff --git a/src/windy/platforms/win32/platform.nim b/src/windy/platforms/win32/platform.nim
index e8486f8b..6aa59ed5 100644
--- a/src/windy/platforms/win32/platform.nim
+++ b/src/windy/platforms/win32/platform.nim
@@ -966,6 +966,7 @@ proc wndProc(
     discard GetCursorPos(pos.addr)
     discard ScreenToClient(window.hWnd, pos.addr)
     window.state.mousePos = ivec2(pos.x, pos.y)
+    window.state.mouseInside = true
     window.state.perFrame.mouseDelta +=
       window.state.mousePos - window.state.mousePrevPos
     if window.onMouseMove != nil:
@@ -982,6 +983,7 @@ proc wndProc(
     return 0
   of WM_MOUSELEAVE:
     window.trackMouseEventRegistered = false
+    window.state.mouseInside = false
     return 0
   of WM_SETCURSOR:
     if LOWORD(lParam) == HTCLIENT:
@@ -1374,6 +1376,10 @@ proc icon*(window: Window): Image =
 proc mousePos*(window: Window): IVec2 =
   window.state.mousePos
 
+proc mouseInside*(window: Window): bool =
+  ## True while the cursor is over this window's content.
+  window.state.mouseInside
+
 proc mousePrevPos*(window: Window): IVec2 =
   window.state.mousePrevPos
 
diff --git a/tests/run_all.nim b/tests/run_all.nim
index fe782d4d..e6b75129 100644
--- a/tests/run_all.nim
+++ b/tests/run_all.nim
@@ -16,6 +16,7 @@ const Examples = [
   "fixedsize",
   "fullscreen",
   "icon",
+  "mouse_inside",
   "opengl_version",
   "openurl",
   "property_changes",
diff --git a/tests/run_all_emscripten.nim b/tests/run_all_emscripten.nim
index 8f051e51..87b7a5f9 100644
--- a/tests/run_all_emscripten.nim
+++ b/tests/run_all_emscripten.nim
@@ -21,6 +21,7 @@ const Examples = [
   "fixedsize",
   "fullscreen",
   "icon",
+  "mouse_inside",
   "opengl_version",
   "openurl",
   "property_changes",