Update to adress latest comments

specs/CoreWebView2ControllerOptions.DefaultBackgroundColor.md

@@ -27,23 +27,31 @@ applies the color too late.
 ```cpp
  HRESULT AppWindow::CreateControllerWithOptions()
 {
-    wil::com_ptr<ICoreWebView2ControllerOptions> options;
+    wil::com_ptr<ICoreWebView2ControllerOptions4> options4;
     HRESULT hr = m_environment->CreateCoreWebView2ControllerOptions(&options);
 
-    wil::com_ptr<ICoreWebView2ControllerOptions> stagingOptions;
+    if (hr == E_INVALIDARG)
+    {
+        return S_OK;
+    }
+
+    wil::com_ptr<ICoreWebView2ControllerOptions4> options4;
     auto result = options->QueryInterface(IID_PPV_ARGS(&stagingOptions));
 
     if (SUCCEEDED(result))
     {
         COREWEBVIEW2_COLOR wvColor{255, 223, 225, 225};
         stagingOptions->put_DefaultBackgroundColor(wvColor);
-
-        m_environment->CreateCoreWebView2Controller(
-            m_mainWindow, options.Get(),
-            Callback<ICoreWebView2CreateCoreWebView2ControllerCompletedHandler>(
-                this, &AppWindow::OnCreateCoreWebView2ControllerCompleted).Get());
     }
 
+    m_environment->CreateCoreWebView2Controller(
+        m_mainWindow,
+        SUCCEEDED(result) ? stagingOptions.Get() : options.Get(),
+        Callback<ICoreWebView2CreateCoreWebView2ControllerCompletedHandler>(
+            this, &AppWindow::OnCreateCoreWebView2ControllerCompleted).Get());
+
+    return S_OK;
+
 }
 ```
 
@@ -53,15 +61,16 @@ applies the color too late.
 ```c#
 public MainWindow()
 {
-InitializeComponent();
-SetDefaultBackgroundColor();
+    InitializeComponent();
+    SetDefaultBackgroundColor();
 }
 
 private void SetDefaultBackgroundColor()
 {
-    CoreWebView2ControllerOptions options = WebView2.CoreWebView2.Environment.CreateCoreWebView2ControllerOptions();
+    CoreWebView2Environment environment = CoreWebView2Environment.CreateAsync();
+    CoreWebView2ControllerOptions options = environment.CreateCoreWebView2ControllerOptions();
     options.DefaultBackgroundColor = Color.FromArgb(0, 0, 255);
-    WebView2.CoreWebView2.Environment.CreateCoreWebView2ControllerAsync(parentHwnd, options);
+    WebView2.EnsureCoreWebView2Async(environment, options);  
 }
 
 ```
@@ -87,15 +96,14 @@ interface ICoreWebView2ControllerOptions4 : IUnknown {
   ///
   /// The `DefaultBackgroundColor` is the color that renders underneath all web
   /// content. This means WebView renders this color when there is no web 
-  /// content loaded. It is important to note that the default color is white. 
+  /// content loaded. When no background color is defined in WebView2, it uses
+  /// the `DefaultBackgroundColor` property to render the background.
+  /// By default, this color is set to white.
+  ///
   /// Currently this API only supports opaque colors and transparency. It will
   /// fail for colors with alpha values that don't equal 0 or 255 ie. translucent
-  /// colors are not supported. It also does not support transparency on Windows 7.
-  /// On Windows 7, setting DefaultBackgroundColor to a Color with an Alpha value 
-  /// other than 255 will result in failure. On any OS above Win7, choosing a 
-  /// transparent color will result in showing hosting app content. This means 
-  /// webpages without explicit background properties defined will render web
-  /// content over hosting app content.
+  /// colors are not supported. When WebView2 is set to have a transparent background, 
+  /// it renders the content of the parent window behind it.
 
   [propget] HRESULT DefaultBackgroundColor([out, retval] COREWEBVIEW2_COLOR* value);
   [propput] HRESULT DefaultBackgroundColor([in] COREWEBVIEW2_COLOR value);