diff --git a/eng/testing/tests.browser.targets b/eng/testing/tests.browser.targets
index a0d183432ca4f..203183c4dfdc3 100644
--- a/eng/testing/tests.browser.targets
+++ b/eng/testing/tests.browser.targets
@@ -8,9 +8,6 @@
   <PropertyGroup>
     <IsBrowserWasmProject Condition="'$(IsBrowserWasmProject)' == ''">true</IsBrowserWasmProject>
 
-    <!-- some tests require full ICU data, force it for all the tests -->
-    <WasmIncludeFullIcuData>true</WasmIncludeFullIcuData>
-
     <!-- set this when provisioning emsdk on CI -->
     <EMSDK_PATH Condition="'$(EMSDK_PATH)' == '' and '$(ContinuousIntegrationBuild)' == 'true' and '$(MonoProjectRoot)' != ''">$([MSBuild]::NormalizeDirectory($(MonoProjectRoot), 'wasm', 'emsdk'))</EMSDK_PATH>
 
@@ -35,6 +32,14 @@
     <_BundleAOTTestWasmAppForHelixDependsOn>$(_BundleAOTTestWasmAppForHelixDependsOn);PrepareForWasmBuildApp;_PrepareForAOTOnHelix</_BundleAOTTestWasmAppForHelixDependsOn>
   </PropertyGroup>
 
+  <!-- We expect WASM users to indicate they would like to have bigger download size by adding WasmIncludeFullIcuData, -->
+  <!-- by default we make their icu small by sharding. -->
+  <!-- Trimming test InvariantGlobalizationFalse requires full ICU data. -->
+  <!-- ToDo: edit after https://github.com/dotnet/runtime/issues/82819 is merged -->
+  <PropertyGroup Condition="'$(TestTrimming)' == 'true'">
+    <WasmIncludeFullIcuData>true</WasmIncludeFullIcuData>
+  </PropertyGroup>
+
   <!-- On CI this is installed as part of pretest, but it should still be installed
        for WBT, and debugger tests -->
   <Import Project="$(MSBuildThisFileDirectory)wasm-provisioning.targets"
diff --git a/src/libraries/System.Collections.NonGeneric/tests/System.Collections.NonGeneric.Tests.csproj b/src/libraries/System.Collections.NonGeneric/tests/System.Collections.NonGeneric.Tests.csproj
index 60b01faed6ed1..69a3250dd1597 100644
--- a/src/libraries/System.Collections.NonGeneric/tests/System.Collections.NonGeneric.Tests.csproj
+++ b/src/libraries/System.Collections.NonGeneric/tests/System.Collections.NonGeneric.Tests.csproj
@@ -3,6 +3,9 @@
     <IncludeRemoteExecutor>true</IncludeRemoteExecutor>
     <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
     <DebuggerSupport Condition="'$(DebuggerSupport)' == '' and '$(TargetOS)' == 'browser'">true</DebuggerSupport>
+
+     <!-- some tests require full ICU data, force it -->
+    <WasmIncludeFullIcuData>true</WasmIncludeFullIcuData>
   </PropertyGroup>
   <ItemGroup>
     <!-- Common Collections tests -->
diff --git a/src/libraries/System.Globalization.Calendars/tests/System.Globalization.Calendars.Tests.csproj b/src/libraries/System.Globalization.Calendars/tests/System.Globalization.Calendars.Tests.csproj
index 2a64681a8b567..6d348d0875922 100644
--- a/src/libraries/System.Globalization.Calendars/tests/System.Globalization.Calendars.Tests.csproj
+++ b/src/libraries/System.Globalization.Calendars/tests/System.Globalization.Calendars.Tests.csproj
@@ -2,6 +2,9 @@
   <PropertyGroup>
     <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
     <TestRuntime>true</TestRuntime>
+
+     <!-- some tests require full ICU data, force it -->
+    <WasmIncludeFullIcuData>true</WasmIncludeFullIcuData>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="System\Globalization\CalendarTestBase.cs" />
diff --git a/src/libraries/System.Globalization/tests/System.Globalization.Tests.csproj b/src/libraries/System.Globalization/tests/System.Globalization.Tests.csproj
index 5eff88d38b618..ada12a42e5451 100644
--- a/src/libraries/System.Globalization/tests/System.Globalization.Tests.csproj
+++ b/src/libraries/System.Globalization/tests/System.Globalization.Tests.csproj
@@ -5,6 +5,9 @@
     <IncludeRemoteExecutor>true</IncludeRemoteExecutor>
     <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
     <UnicodeUcdVersion>15.0</UnicodeUcdVersion>
+
+     <!-- some tests require full ICU data, force it -->
+    <WasmIncludeFullIcuData>true</WasmIncludeFullIcuData>
   </PropertyGroup>
   <ItemGroup>
     <RdXmlFile Include="default.rd.xml" />
diff --git a/src/libraries/System.Runtime.Extensions/tests/System.Runtime.Extensions.Tests.csproj b/src/libraries/System.Runtime.Extensions/tests/System.Runtime.Extensions.Tests.csproj
index 3e2285f9612c3..75008d1bde78e 100644
--- a/src/libraries/System.Runtime.Extensions/tests/System.Runtime.Extensions.Tests.csproj
+++ b/src/libraries/System.Runtime.Extensions/tests/System.Runtime.Extensions.Tests.csproj
@@ -5,6 +5,9 @@
     <IncludeRemoteExecutor>true</IncludeRemoteExecutor>
     <EnableLibraryImportGenerator>true</EnableLibraryImportGenerator>
     <TargetFrameworks>$(NetCoreAppCurrent)-windows;$(NetCoreAppCurrent)-unix;$(NetCoreAppCurrent)-browser</TargetFrameworks>
+
+     <!-- some tests require full ICU data, force it -->
+    <WasmIncludeFullIcuData>true</WasmIncludeFullIcuData>
   </PropertyGroup>
   <!-- DesignTimeBuild requires all the TargetFramework Derived Properties to not be present in the first property group. -->
   <PropertyGroup>
diff --git a/src/libraries/System.Runtime/tests/System.Runtime.Tests.csproj b/src/libraries/System.Runtime/tests/System.Runtime.Tests.csproj
index e6c2e676370fc..1075771443eef 100644
--- a/src/libraries/System.Runtime/tests/System.Runtime.Tests.csproj
+++ b/src/libraries/System.Runtime/tests/System.Runtime.Tests.csproj
@@ -8,6 +8,9 @@
     <!-- Disable nullability public only feature for NullabilityInfoContextTests -->
     <Features>$(Features.Replace('nullablePublicOnly', '')</Features>
 
+     <!-- some tests require full ICU data, force it -->
+    <WasmIncludeFullIcuData>true</WasmIncludeFullIcuData>
+    
     <!-- The test is looking for debugger attributes we would have stripped with NativeAOT -->
     <IlcKeepManagedDebuggerSupport>true</IlcKeepManagedDebuggerSupport>
   </PropertyGroup>
diff --git a/src/libraries/System.Text.RegularExpressions/tests/FunctionalTests/System.Text.RegularExpressions.Tests.csproj b/src/libraries/System.Text.RegularExpressions/tests/FunctionalTests/System.Text.RegularExpressions.Tests.csproj
index cd7501f1f9ee9..539ad69bcaf83 100644
--- a/src/libraries/System.Text.RegularExpressions/tests/FunctionalTests/System.Text.RegularExpressions.Tests.csproj
+++ b/src/libraries/System.Text.RegularExpressions/tests/FunctionalTests/System.Text.RegularExpressions.Tests.csproj
@@ -10,6 +10,8 @@
     <EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
     <IsHighAotMemoryUsageTest>true</IsHighAotMemoryUsageTest> <!-- to avoid OOMs with source generation in wasm: https://github.com/dotnet/runtime/pull/60701 -->
 
+     <!-- some tests require full ICU data, force it -->
+    <WasmIncludeFullIcuData>true</WasmIncludeFullIcuData>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="AttRegexTests.cs" />