diff --git a/shell/browser/native_window.cc b/shell/browser/native_window.cc
index d775c635bc2d..469d9cd01ac5 100644
--- a/shell/browser/native_window.cc
+++ b/shell/browser/native_window.cc
@@ -354,10 +354,14 @@ void NativeWindow::SetContentSizeConstraints(
   size_constraints_.reset();
 }
 
+// Windows/Linux:
 // The return value of GetContentSizeConstraints will be passed to Chromium
 // to set min/max sizes of window. Note that we are returning content size
 // instead of window size because that is what Chromium expects, see the
 // comment of |WidgetSizeIsClientSize| in Chromium's codebase to learn more.
+//
+// macOS:
+// The min/max sizes are set directly by calling NSWindow's methods.
 extensions::SizeConstraints NativeWindow::GetContentSizeConstraints() const {
   if (content_size_constraints_)
     return *content_size_constraints_;
diff --git a/shell/browser/native_window_mac.h b/shell/browser/native_window_mac.h
index 9b089c52640f..a1c70ba2a0f2 100644
--- a/shell/browser/native_window_mac.h
+++ b/shell/browser/native_window_mac.h
@@ -58,6 +58,8 @@ class NativeWindowMac : public NativeWindow,
   gfx::Rect GetBounds() override;
   bool IsNormal() override;
   gfx::Rect GetNormalBounds() override;
+  void SetSizeConstraints(
+      const extensions::SizeConstraints& window_constraints) override;
   void SetContentSizeConstraints(
       const extensions::SizeConstraints& size_constraints) override;
   void SetResizable(bool resizable) override;
diff --git a/shell/browser/native_window_mac.mm b/shell/browser/native_window_mac.mm
index 805ab87b2df3..be27cd8a5821 100644
--- a/shell/browser/native_window_mac.mm
+++ b/shell/browser/native_window_mac.mm
@@ -761,6 +761,16 @@ gfx::Rect NativeWindowMac::GetNormalBounds() {
   // return widget()->GetRestoredBounds();
 }
 
+void NativeWindowMac::SetSizeConstraints(
+    const extensions::SizeConstraints& window_constraints) {
+  // Apply the size constraints to NSWindow.
+  if (window_constraints.HasMinimumSize())
+    [window_ setMinSize:window_constraints.GetMinimumSize().ToCGSize()];
+  if (window_constraints.HasMaximumSize())
+    [window_ setMaxSize:window_constraints.GetMaximumSize().ToCGSize()];
+  NativeWindow::SetSizeConstraints(window_constraints);
+}
+
 void NativeWindowMac::SetContentSizeConstraints(
     const extensions::SizeConstraints& size_constraints) {
   auto convertSize = [this](const gfx::Size& size) {
@@ -775,6 +785,7 @@ void NativeWindowMac::SetContentSizeConstraints(
     }
   };
 
+  // Apply the size constraints to NSWindow.
   NSView* content = [window_ contentView];
   if (size_constraints.HasMinimumSize()) {
     NSSize min_size = convertSize(size_constraints.GetMinimumSize());