add missing stubs.

src/Web/Avalonia.Web/ClipboardImpl.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Avalonia.Input;
+using Avalonia.Input.Platform;
+
+namespace Avalonia.Web.Blazor
+{
+    internal class ClipboardImpl : IClipboard
+    {
+        public async Task<string> GetTextAsync()
+        {
+            throw new NotImplementedException();
+            //return await AvaloniaLocator.Current.GetRequiredService<IJSInProcessRuntime>().
+              //  InvokeAsync<string>("navigator.clipboard.readText");
+        }
+
+        public async Task SetTextAsync(string text)
+        {
+            throw new NotImplementedException();
+            //await AvaloniaLocator.Current.GetRequiredService<IJSInProcessRuntime>().
+              //  InvokeAsync<string>("navigator.clipboard.writeText",text);
+        }
+
+        public async Task ClearAsync() => await SetTextAsync("");
+
+        public Task SetDataObjectAsync(IDataObject data) => Task.CompletedTask;
+
+        public Task<string[]> GetFormatsAsync() => Task.FromResult(Array.Empty<string>());
+
+        public Task<object> GetDataAsync(string format) => Task.FromResult<object>(new());
+    }
+}

src/Web/Avalonia.Web/Cursor.cs

@@ -0,0 +1,95 @@
+using System;
+using System.IO;
+using Avalonia.Input;
+using Avalonia.Platform;
+
+namespace Avalonia.Web.Blazor
+{
+    public class CssCursor : ICursorImpl
+    {
+        public const string Default = "default";
+        public string? Value { get; set; }
+        
+        public CssCursor(StandardCursorType type)
+        {
+            Value = ToKeyword(type);
+        }
+
+        /// <summary>
+        /// Create a cursor from base64 image
+        /// </summary>
+        public CssCursor(string base64, string format, PixelPoint hotspot, StandardCursorType fallback)
+        {
+            Value = $"url(\"data:image/{format};base64,{base64}\") {hotspot.X} {hotspot.Y}, {ToKeyword(fallback)}";
+        }
+        
+        /// <summary>
+        /// Create a cursor from url to *.cur file.
+        /// </summary>
+        public CssCursor(string url, StandardCursorType fallback)
+        {
+            Value = $"url('{url}'), {ToKeyword(fallback)}";
+        }
+        
+        /// <summary>
+        /// Create a cursor from png/svg and hotspot position
+        /// </summary>
+        public CssCursor(string url, PixelPoint hotSpot, StandardCursorType fallback)
+        {
+            Value = $"url('{url}') {hotSpot.X} {hotSpot.Y}, {ToKeyword(fallback)}";
+        }
+        
+        private static string ToKeyword(StandardCursorType type) => type switch
+        {
+            StandardCursorType.Hand => "pointer",
+            StandardCursorType.Cross => "crosshair",
+            StandardCursorType.Help => "help",
+            StandardCursorType.Ibeam => "text",
+            StandardCursorType.No => "not-allowed",
+            StandardCursorType.None => "none",
+            StandardCursorType.Wait => "progress",
+            StandardCursorType.AppStarting => "wait",
+            
+            StandardCursorType.DragMove => "move",
+            StandardCursorType.DragCopy => "copy",
+            StandardCursorType.DragLink => "alias",
+            
+            StandardCursorType.UpArrow => "default",/*not found matching one*/
+            StandardCursorType.SizeWestEast => "ew-resize",
+            StandardCursorType.SizeNorthSouth => "ns-resize",
+            StandardCursorType.SizeAll => "move",
+            
+            StandardCursorType.TopSide => "n-resize",
+            StandardCursorType.BottomSide => "s-resize",
+            StandardCursorType.LeftSide => "w-resize",
+            StandardCursorType.RightSide => "e-resize",
+            StandardCursorType.TopLeftCorner => "nw-resize",
+            StandardCursorType.TopRightCorner => "ne-resize",
+            StandardCursorType.BottomLeftCorner => "sw-resize",
+            StandardCursorType.BottomRightCorner => "se-resize",
+            
+            _ => Default,
+        };
+        
+        public void Dispose() {}
+    }
+
+    internal class CssCursorFactory : ICursorFactory
+    {
+        public ICursorImpl CreateCursor(IBitmapImpl cursor, PixelPoint hotSpot)
+        {
+            using var imageStream = new MemoryStream();
+            cursor.Save(imageStream);
+            
+            //not memory optimized because CryptoStream with ToBase64Transform is not supported in the browser.
+            var base64String = Convert.ToBase64String(imageStream.ToArray());
+            return new CssCursor(base64String, "png", hotSpot, StandardCursorType.Arrow);
+        }
+
+        ICursorImpl ICursorFactory.GetCursor(StandardCursorType cursorType)
+        {
+            return new CssCursor(cursorType);
+        }
+    }
+}
+

src/Web/Avalonia.Web/WindowingPlatform.cs

@@ -38,8 +38,8 @@ namespace Avalonia.Web.Blazor
             var instance = new BlazorWindowingPlatform();
             s_keyboard = new KeyboardDevice();
             AvaloniaLocator.CurrentMutable
-                //.Bind<IClipboard>().ToSingleton<ClipboardImpl>()
-                //.Bind<ICursorFactory>().ToSingleton<CssCursorFactory>()
+                .Bind<IClipboard>().ToSingleton<ClipboardImpl>()
+                .Bind<ICursorFactory>().ToSingleton<CssCursorFactory>()
                 .Bind<IKeyboardDevice>().ToConstant(s_keyboard)
                 .Bind<IPlatformSettings>().ToConstant(instance)
                 .Bind<IPlatformThreadingInterface>().ToConstant(instance)