diff --git a/src/Web/Avalonia.Web/Avalonia.Web.props b/src/Web/Avalonia.Web/Avalonia.Web.props
index 6c975cd284..668dd20789 100644
--- a/src/Web/Avalonia.Web/Avalonia.Web.props
+++ b/src/Web/Avalonia.Web/Avalonia.Web.props
@@ -1,5 +1,5 @@
-<Project>  
+<Project>
   <PropertyGroup>
-    <EmccExtraLDFlags>$(EmccExtraLDFlags) --js-library="$(MSBuildThisFileDirectory)\interop.js"</EmccExtraLDFlags>
+    <EmccInitialHeapSize>16384000</EmccInitialHeapSize> <!-- must be a multiple of 64KiB, 1024000 * num MB, number grows -->
   </PropertyGroup>
 </Project>
diff --git a/src/Web/Avalonia.Web/Avalonia.Web.targets b/src/Web/Avalonia.Web/Avalonia.Web.targets
index d1bec2aa93..b6a09b33ef 100644
--- a/src/Web/Avalonia.Web/Avalonia.Web.targets
+++ b/src/Web/Avalonia.Web/Avalonia.Web.targets
@@ -4,4 +4,34 @@
     <NativeFileReference Include="$(HarfBuzzSharpStaticLibraryPath)\3.1.7\libHarfBuzzSharp.a" />
     <NativeFileReference Include="$(SkiaSharpStaticLibraryPath)\3.1.7\libSkiaSharp.a" />
   </ItemGroup>
+
+  <PropertyGroup>
+    <UseAvaloniaWasmDefaultOptimizations Condition="'$(UseAvaloniaWasmDefaultOptimizations)'==''">True</UseAvaloniaWasmDefaultOptimizations>
+    <EmccExtraLDFlags>$(EmccExtraLDFlags) --js-library="$(MSBuildThisFileDirectory)\interop.js"</EmccExtraLDFlags>
+    <EmccFlags>$(EmccExtraLDFlags) -sERROR_ON_UNDEFINED_SYMBOLS=0</EmccFlags>
+    <WasmBuildNative>true</WasmBuildNative>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(UseAvaloniaWasmDefaultOptimizations)'=='True'">
+    <PublishTrimmed>true</PublishTrimmed>
+    <TrimMode>full</TrimMode>
+    <InvariantGlobalization>true</InvariantGlobalization>
+    <EmccCompileOptimizationFlag>-Oz</EmccCompileOptimizationFlag>
+    <EmccLinkOptimizationFlag>-Oz</EmccLinkOptimizationFlag>
+    <WasmEmitSymbolMap>false</WasmEmitSymbolMap>
+    <WasmNativeDebugSymbols>false</WasmNativeDebugSymbols>
+    <WasmDebugLevel>0</WasmDebugLevel>
+    <WasmEnableExceptionHandling>false</WasmEnableExceptionHandling>
+    <TrimmerRemoveSymbols>true</TrimmerRemoveSymbols>
+    <DebuggerSupport>false</DebuggerSupport>
+    <EnableUnsafeBinaryFormatterSerialization>false</EnableUnsafeBinaryFormatterSerialization>
+    <EnableUnsafeUTF7Encoding>false</EnableUnsafeUTF7Encoding>
+    <EventSourceSupport>false</EventSourceSupport>
+    <HttpActivityPropagationSupport>false</HttpActivityPropagationSupport>
+    <MetadataUpdaterSupport>false</MetadataUpdaterSupport>
+    <UseNativeHttpHandler>true</UseNativeHttpHandler>
+    <UseSystemResourceKeys>true</UseSystemResourceKeys>
+    <SatelliteResourceLanguages>en</SatelliteResourceLanguages>
+    <IncludeSatelliteDllsProjectOutputGroup>false</IncludeSatelliteDllsProjectOutputGroup>
+  </PropertyGroup>
 </Project>
diff --git a/src/Web/Avalonia.Web/Interop/CanvasHelper.cs b/src/Web/Avalonia.Web/Interop/CanvasHelper.cs
index efa94916fa..5bbe503bc1 100644
--- a/src/Web/Avalonia.Web/Interop/CanvasHelper.cs
+++ b/src/Web/Avalonia.Web/Interop/CanvasHelper.cs
@@ -33,7 +33,7 @@ internal static partial class CanvasHelper
     public static partial void RequestAnimationFrame(JSObject canvas, bool renderLoop);
 
     [JSImport("Canvas.setCanvasSize", AvaloniaModule.MainModuleName)]
-    public static partial void SetCanvasSize(JSObject canvas, int height, int width);
+    public static partial void SetCanvasSize(JSObject canvas, int width, int height);
 
     [JSImport("Canvas.initGL", AvaloniaModule.MainModuleName)]
     private static partial JSObject InitGL(
diff --git a/src/Web/Avalonia.Web/webapp/modules/avalonia/input.ts b/src/Web/Avalonia.Web/webapp/modules/avalonia/input.ts
index ddc1f54ae7..faede82e0d 100644
--- a/src/Web/Avalonia.Web/webapp/modules/avalonia/input.ts
+++ b/src/Web/Avalonia.Web/webapp/modules/avalonia/input.ts
@@ -98,27 +98,23 @@ export class InputHelper {
         wheelCallback: (args: WheelEvent) => boolean
     ) {
         const pointerMoveHandler = (args: PointerEvent) => {
-            if (pointerMoveCallback(args)) {
-                args.preventDefault();
-            }
+            pointerMoveCallback(args);
+            args.preventDefault();
         };
 
         const pointerDownHandler = (args: PointerEvent) => {
-            if (pointerDownCallback(args)) {
-                args.preventDefault();
-            }
+            pointerDownCallback(args);
+            args.preventDefault();
         };
 
         const pointerUpHandler = (args: PointerEvent) => {
-            if (pointerUpCallback(args)) {
-                args.preventDefault();
-            }
+            pointerUpCallback(args);
+            args.preventDefault();
         };
 
         const wheelHandler = (args: WheelEvent) => {
-            if (wheelCallback(args)) {
-                args.preventDefault();
-            }
+            wheelCallback(args);
+            args.preventDefault();
         };
 
         element.addEventListener("pointermove", pointerMoveHandler);