From e09032ed6397fb1dd893cacd53642ccb6a27e79d Mon Sep 17 00:00:00 2001
From: Steve Molloy <smolloy@microsoft.com>
Date: Mon, 4 Aug 2025 00:07:57 -0700
Subject: [PATCH 1/2] Turn 'em on - lets see what is still a problem.

---
 .../XmlSerializerTests.RuntimeOnly.cs         |  6 +--
 .../tests/XmlSerializer/XmlSerializerTests.cs |  9 ++--
 .../Serialization/Schema/RoundTripTest.cs     |  6 +--
 .../tests/DataContractSerializer.cs           | 52 +++++++++----------
 .../DataContractSerializerStressTests.cs      |  2 +-
 .../tests/XmlDictionaryWriterTest.cs          |  2 +-
 .../ExporterApiTests.cs                       |  6 +--
 .../ExporterTypesTests.cs                     |  2 +-
 8 files changed, 43 insertions(+), 42 deletions(-)

diff --git a/src/libraries/System.Private.Xml/tests/XmlSerializer/XmlSerializerTests.RuntimeOnly.cs b/src/libraries/System.Private.Xml/tests/XmlSerializer/XmlSerializerTests.RuntimeOnly.cs
index befb45d566b1a1..4eea1511567311 100644
--- a/src/libraries/System.Private.Xml/tests/XmlSerializer/XmlSerializerTests.RuntimeOnly.cs
+++ b/src/libraries/System.Private.Xml/tests/XmlSerializer/XmlSerializerTests.RuntimeOnly.cs
@@ -3196,7 +3196,7 @@ public static void XmlMembersMapping_Soap_MultipleMembers_IsReturnValue()
     }
 
     [Fact]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/1395")]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/1395")]
     public static void Xml_TypeWithReadOnlyMyCollectionProperty()
     {
         var value = new TypeWithReadOnlyMyCollectionProperty();
@@ -3366,7 +3366,7 @@ public static void Xml_NookTypes()
     }
 
     [Fact]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DerivedTypeWithDifferentOverrides()
     {
         DerivedTypeWithDifferentOverrides value = new DerivedTypeWithDifferentOverrides() { Name1 = "Name1", Name2 = "Name2", Name3 = "Name3", Name4 = "Name4", Name5 = "Name5" };
@@ -3379,7 +3379,7 @@ public static void DerivedTypeWithDifferentOverrides()
     }
 
     [Fact]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DerivedTypeWithDifferentOverrides2()
     {
         DerivedTypeWithDifferentOverrides2 value = new DerivedTypeWithDifferentOverrides2() { Name1 = "Name1", Name2 = "Name2", Name3 = "Name3", Name4 = "Name4", Name5 = "Name5", Name6 = "Name6", Name7 = "Name7" };
diff --git a/src/libraries/System.Private.Xml/tests/XmlSerializer/XmlSerializerTests.cs b/src/libraries/System.Private.Xml/tests/XmlSerializer/XmlSerializerTests.cs
index 0d94c9fb861b25..a829a5fc7875f3 100644
--- a/src/libraries/System.Private.Xml/tests/XmlSerializer/XmlSerializerTests.cs
+++ b/src/libraries/System.Private.Xml/tests/XmlSerializer/XmlSerializerTests.cs
@@ -43,6 +43,7 @@ static XmlSerializerTests()
     }
 #endif
 
+    // TODO smolloy - look into this. See simple repro at C:\Users\smolloy\source\play\XmlSerializerDefaultAttributeTrimmed - play with DefaultValueAttributeSupport property
     public static bool DefaultValueAttributeIsSupported => AppContext.TryGetSwitch("System.ComponentModel.DefaultValueAttribute.IsSupported", out bool isEnabled) ? isEnabled : true;
 
     [Fact]
@@ -265,7 +266,7 @@ public static void Xml_ListRoot()
     // horizon that it's not worth the trouble.
 #if !XMLSERIALIZERGENERATORTESTS
     [Fact]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/74247", TestPlatforms.tvOS)]
+//    [ActiveIssue("https://github.com/dotnet/runtime/issues/74247", TestPlatforms.tvOS)]
     public static void Xml_ReadOnlyCollection()
     {
         ReadOnlyCollection<string> roc = new ReadOnlyCollection<string>(new string[] { "one", "two" });
@@ -287,7 +288,7 @@ public static void Xml_ReadOnlyCollection()
 
     [Theory]
     [MemberData(nameof(Xml_ImmutableCollections_MemberData))]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/74247", TestPlatforms.tvOS)]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/74247", TestPlatforms.tvOS)]
     public static void Xml_ImmutableCollections(Type type, object collection, Type createException, Type addException, string expectedXml, string exMsg = null)
     {
         XmlSerializer serializer;
@@ -2309,8 +2310,8 @@ public static void Xml_TypeWithSpecialCharacterInStringMember()
     // loaded in the default ALC, which causes problems for this test.
     [SkipOnPlatform(TestPlatforms.Browser, "AssemblyDependencyResolver not supported in wasm")]
 #endif
-    [ActiveIssue("34072", TestRuntimes.Mono)]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/96799", typeof(PlatformDetection), nameof(PlatformDetection.IsReadyToRunCompiled))]
+//    [ActiveIssue("34072", TestRuntimes.Mono)]
+//    [ActiveIssue("https://github.com/dotnet/runtime/issues/96799", typeof(PlatformDetection), nameof(PlatformDetection.IsReadyToRunCompiled))]
     public static void Xml_TypeInCollectibleALC()
     {
         ExecuteAndUnload("SerializableAssembly.dll", "SerializationTypes.SimpleType", out var weakRef);
diff --git a/src/libraries/System.Runtime.Serialization.Schema/tests/System/Runtime/Serialization/Schema/RoundTripTest.cs b/src/libraries/System.Runtime.Serialization.Schema/tests/System/Runtime/Serialization/Schema/RoundTripTest.cs
index f1a852b3a510ab..5ec2098c11b805 100644
--- a/src/libraries/System.Runtime.Serialization.Schema/tests/System/Runtime/Serialization/Schema/RoundTripTest.cs
+++ b/src/libraries/System.Runtime.Serialization.Schema/tests/System/Runtime/Serialization/Schema/RoundTripTest.cs
@@ -22,8 +22,8 @@ public RoundTripTest(ITestOutputHelper output)
         }
 
         [Fact]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsBrowser))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsMonoRuntime), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsAppleMobile))]
+        //[ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsBrowser))]
+        //[ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsMonoRuntime), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsAppleMobile))]
         public void RountTripTest()
         {
             // AppContext SetSwitch seems to be unreliable in the unit test case. So let's not rely on it
@@ -81,7 +81,7 @@ public void RountTripTest()
         }
 
         [Fact]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsBrowser))]
+        //[ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsBrowser))]
         public void RoundTripXmlSerializableWithSpecialAttributesTest()
         {
             XsdDataContractExporter exporter = new XsdDataContractExporter();
diff --git a/src/libraries/System.Runtime.Serialization.Xml/tests/DataContractSerializer.cs b/src/libraries/System.Runtime.Serialization.Xml/tests/DataContractSerializer.cs
index 7f5599020944f7..e0144a928e50be 100644
--- a/src/libraries/System.Runtime.Serialization.Xml/tests/DataContractSerializer.cs
+++ b/src/libraries/System.Runtime.Serialization.Xml/tests/DataContractSerializer.cs
@@ -35,7 +35,7 @@ static DataContractSerializerTests()
     }
 #endif
     [Fact]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_DateTimeOffsetAsRoot()
     {
         // Assume that UTC offset doesn't change more often than once in the day 2013-01-02
@@ -1094,7 +1094,7 @@ public static void DCS_WithListOfXElement()
     }
 
     [Fact]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_DerivedTypeWithDifferentOverrides()
     {
         var x = new DerivedTypeWithDifferentOverrides() { Name1 = "Name1", Name2 = "Name2", Name3 = "Name3", Name4 = "Name4", Name5 = "Name5" };
@@ -1122,7 +1122,7 @@ public static void DCS_TypeNamesWithSpecialCharacters()
     // loaded in the default ALC, which causes problems for this test.
     [SkipOnPlatform(TestPlatforms.Browser, "AssemblyDependencyResolver not supported in wasm")]
 #endif
-    [ActiveIssue("34072", TestRuntimes.Mono)]
+    //[ActiveIssue("34072", TestRuntimes.Mono)]
     public static void DCS_TypeInCollectibleALC()
     {
         ExecuteAndUnload("SerializableAssembly.dll", "SerializationTypes.SimpleType", makeCollection: false, out var weakRef);
@@ -1141,7 +1141,7 @@ public static void DCS_TypeInCollectibleALC()
     // loaded in the default ALC, which causes problems for this test.
     [SkipOnPlatform(TestPlatforms.Browser, "AssemblyDependencyResolver not supported in wasm")]
 #endif
-    [ActiveIssue("34072", TestRuntimes.Mono)]
+    //[ActiveIssue("34072", TestRuntimes.Mono)]
     public static void DCS_CollectionTypeInCollectibleALC()
     {
         ExecuteAndUnload("SerializableAssembly.dll", "SerializationTypes.SimpleType", makeCollection: true, out var weakRef);
@@ -1374,7 +1374,7 @@ public static void DCS_EnumFlags()
     }
 
     [Fact]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_SerializeClassThatImplementsInterface()
     {
         ClassImplementsInterface value = new ClassImplementsInterface() { ClassID = "ClassID", DisplayName = "DisplayName", Id = "Id", IsLoaded = true };
@@ -1529,7 +1529,7 @@ public static void DCS_KnownTypesThroughConstructor()
     }
 
     [Fact]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_DuplicatedKnownTypesWithAdapterThroughConstructor()
     {
         //Constructor# 5
@@ -1657,7 +1657,7 @@ public static void DCS_TypeWithUriTypeProperty()
     }
 
     [Fact]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_TypeWithDatetimeOffsetTypeProperty()
     {
         var value = new TypeWithDateTimeOffsetTypeProperty() { ModifiedTime = new DateTimeOffset(new DateTime(2013, 1, 2, 3, 4, 5, 6, DateTimeKind.Utc)) };
@@ -1876,7 +1876,7 @@ public static void DCS_TypeWithGenericDictionaryAsKnownType()
     }
 
     [Fact]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_TypeWithKnownTypeAttributeAndInterfaceMember()
     {
         TypeWithKnownTypeAttributeAndInterfaceMember value = new TypeWithKnownTypeAttributeAndInterfaceMember();
@@ -1888,7 +1888,7 @@ public static void DCS_TypeWithKnownTypeAttributeAndInterfaceMember()
     }
 
     [Fact]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_TypeWithKnownTypeAttributeAndListOfInterfaceMember()
     {
         TypeWithKnownTypeAttributeAndListOfInterfaceMember value = new TypeWithKnownTypeAttributeAndListOfInterfaceMember();
@@ -1987,7 +1987,7 @@ public static void DCS_GenericTypeWithNestedGenerics()
     }
 
     [Fact]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_DuplicatedKeyDateTimeOffset()
     {
         DateTimeOffset value = new DateTimeOffset(new DateTime(2013, 1, 2, 3, 4, 5, 6, DateTimeKind.Utc).AddMinutes(7));
@@ -2735,7 +2735,7 @@ public static void DCS_NonGenericDictionaryOfStringInt32()
 #endregion
 
     [Fact]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_BasicRoundTripResolveDTOTypes()
     {
         ObjectContainer instance = new ObjectContainer(new DTOContainer());
@@ -2971,7 +2971,7 @@ private static void DCS_BasicRoundTripResolvePrimitiveTypes(string baseline)
     /// Resolver is plugged in and resolves the primitive types. Verify resolver called during ser and deser
     /// </summary>
     [Fact]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_BasicRoundTripResolvePrimitiveTypes_NotNetFramework()
     {
         string baseline = @"<ObjectContainer xmlns=""http://schemas.datacontract.org/2004/07/SerializationTestTypes"" xmlns:i=""http://www.w3.org/2001/XMLSchema-instance""><_data i:type=""a:PrimitiveContainer_foo"" xmlns:a=""http://www.default.com""><a i:type=""a:Boolean_foo"">false</a><array1><anyType xmlns=""http://schemas.microsoft.com/2003/10/Serialization/Arrays""/><anyType xmlns=""http://schemas.microsoft.com/2003/10/Serialization/Arrays""/><anyType xmlns=""http://schemas.microsoft.com/2003/10/Serialization/Arrays""/></array1><b i:type=""a:Byte_foo"">255</b><c i:type=""a:Byte_foo"">0</c><d i:type=""a:Char_foo"">65535</d><e i:type=""a:Decimal_foo"">79228162514264337593543950335</e><f i:type=""a:Decimal_foo"">-1</f><f5 i:type=""a:DateTime_foo"">9999-12-31T23:59:59.9999999</f5><g i:type=""a:Decimal_foo"">-79228162514264337593543950335</g><guidData i:type=""a:Guid_foo"">4bc848b1-a541-40bf-8aa9-dd6ccb6d0e56</guidData><h i:type=""a:Decimal_foo"">1</h><i i:type=""a:Decimal_foo"">0</i><j i:type=""a:Decimal_foo"">0</j><k i:type=""a:Double_foo"">0</k><l i:type=""a:Double_foo"">5E-324</l><lDTO xmlns:b=""http://schemas.datacontract.org/2004/07/System""/><m i:type=""a:Double_foo"">1.7976931348623157E+308</m><n i:type=""a:Double_foo"">-1.7976931348623157E+308</n><nDTO i:type=""a:DateTimeOffset_foo""><DateTime xmlns=""http://schemas.datacontract.org/2004/07/System"">9999-12-31T23:59:59.9999999Z</DateTime><OffsetMinutes xmlns=""http://schemas.datacontract.org/2004/07/System"">0</OffsetMinutes></nDTO><o i:type=""a:Double_foo"">NaN</o><obj/><p i:type=""a:Double_foo"">-INF</p><q i:type=""a:Double_foo"">INF</q><r i:type=""a:Single_foo"">0</r><s i:type=""a:Single_foo"">1E-45</s><strData i:nil=""true""/><t i:type=""a:Single_foo"">-3.4028235E+38</t><timeSpan i:type=""a:TimeSpan_foo"">P10675199DT2H48M5.4775807S</timeSpan><u i:type=""a:Single_foo"">3.4028235E+38</u><uri>http://www.microsoft.com/</uri><v i:type=""a:Single_foo"">NaN</v><w i:type=""a:Single_foo"">-INF</w><x i:type=""a:Single_foo"">INF</x><xmlQualifiedName i:type=""a:XmlQualifiedName_foo"" xmlns:b=""http://www.microsoft.com"">b:WCF</xmlQualifiedName><y i:type=""a:Int32_foo"">0</y><z i:type=""a:Int32_foo"">2147483647</z><z1 i:type=""a:Int32_foo"">-2147483648</z1><z2 i:type=""a:Int64_foo"">0</z2><z3 i:type=""a:Int64_foo"">9223372036854775807</z3><z4 i:type=""a:Int64_foo"">-9223372036854775808</z4><z5/><z6 i:type=""a:SByte_foo"">0</z6><z7 i:type=""a:SByte_foo"">127</z7><z8 i:type=""a:SByte_foo"">-128</z8><z9 i:type=""a:Int16_foo"">0</z9><z91 i:type=""a:Int16_foo"">32767</z91><z92 i:type=""a:Int16_foo"">-32768</z92><z93 i:type=""a:String_foo"">abc</z93><z94 i:type=""a:UInt16_foo"">0</z94><z95 i:type=""a:UInt16_foo"">65535</z95><z96 i:type=""a:UInt16_foo"">0</z96><z97 i:type=""a:UInt32_foo"">0</z97><z98 i:type=""a:UInt32_foo"">4294967295</z98><z99 i:type=""a:UInt32_foo"">0</z99><z990 i:type=""a:UInt64_foo"">0</z990><z991 i:type=""a:UInt64_foo"">18446744073709551615</z991><z992 i:type=""a:UInt64_foo"">0</z992><z993>AQIDBA==</z993></_data><_data2 i:type=""a:PrimitiveContainer_foo"" xmlns:a=""http://www.default.com""><a i:type=""a:Boolean_foo"">false</a><array1><anyType xmlns=""http://schemas.microsoft.com/2003/10/Serialization/Arrays""/><anyType xmlns=""http://schemas.microsoft.com/2003/10/Serialization/Arrays""/><anyType xmlns=""http://schemas.microsoft.com/2003/10/Serialization/Arrays""/></array1><b i:type=""a:Byte_foo"">255</b><c i:type=""a:Byte_foo"">0</c><d i:type=""a:Char_foo"">65535</d><e i:type=""a:Decimal_foo"">79228162514264337593543950335</e><f i:type=""a:Decimal_foo"">-1</f><f5 i:type=""a:DateTime_foo"">9999-12-31T23:59:59.9999999</f5><g i:type=""a:Decimal_foo"">-79228162514264337593543950335</g><guidData i:type=""a:Guid_foo"">4bc848b1-a541-40bf-8aa9-dd6ccb6d0e56</guidData><h i:type=""a:Decimal_foo"">1</h><i i:type=""a:Decimal_foo"">0</i><j i:type=""a:Decimal_foo"">0</j><k i:type=""a:Double_foo"">0</k><l i:type=""a:Double_foo"">5E-324</l><lDTO xmlns:b=""http://schemas.datacontract.org/2004/07/System""/><m i:type=""a:Double_foo"">1.7976931348623157E+308</m><n i:type=""a:Double_foo"">-1.7976931348623157E+308</n><nDTO i:type=""a:DateTimeOffset_foo""><DateTime xmlns=""http://schemas.datacontract.org/2004/07/System"">9999-12-31T23:59:59.9999999Z</DateTime><OffsetMinutes xmlns=""http://schemas.datacontract.org/2004/07/System"">0</OffsetMinutes></nDTO><o i:type=""a:Double_foo"">NaN</o><obj/><p i:type=""a:Double_foo"">-INF</p><q i:type=""a:Double_foo"">INF</q><r i:type=""a:Single_foo"">0</r><s i:type=""a:Single_foo"">1E-45</s><strData i:nil=""true""/><t i:type=""a:Single_foo"">-3.4028235E+38</t><timeSpan i:type=""a:TimeSpan_foo"">P10675199DT2H48M5.4775807S</timeSpan><u i:type=""a:Single_foo"">3.4028235E+38</u><uri>http://www.microsoft.com/</uri><v i:type=""a:Single_foo"">NaN</v><w i:type=""a:Single_foo"">-INF</w><x i:type=""a:Single_foo"">INF</x><xmlQualifiedName i:type=""a:XmlQualifiedName_foo"" xmlns:b=""http://www.microsoft.com"">b:WCF</xmlQualifiedName><y i:type=""a:Int32_foo"">0</y><z i:type=""a:Int32_foo"">2147483647</z><z1 i:type=""a:Int32_foo"">-2147483648</z1><z2 i:type=""a:Int64_foo"">0</z2><z3 i:type=""a:Int64_foo"">9223372036854775807</z3><z4 i:type=""a:Int64_foo"">-9223372036854775808</z4><z5/><z6 i:type=""a:SByte_foo"">0</z6><z7 i:type=""a:SByte_foo"">127</z7><z8 i:type=""a:SByte_foo"">-128</z8><z9 i:type=""a:Int16_foo"">0</z9><z91 i:type=""a:Int16_foo"">32767</z91><z92 i:type=""a:Int16_foo"">-32768</z92><z93 i:type=""a:String_foo"">abc</z93><z94 i:type=""a:UInt16_foo"">0</z94><z95 i:type=""a:UInt16_foo"">65535</z95><z96 i:type=""a:UInt16_foo"">0</z96><z97 i:type=""a:UInt32_foo"">0</z97><z98 i:type=""a:UInt32_foo"">4294967295</z98><z99 i:type=""a:UInt32_foo"">0</z99><z990 i:type=""a:UInt64_foo"">0</z990><z991 i:type=""a:UInt64_foo"">18446744073709551615</z991><z992 i:type=""a:UInt64_foo"">0</z992><z993>AQIDBA==</z993></_data2></ObjectContainer>";
@@ -3217,7 +3217,7 @@ public static void DCS_BasicPerSerializerRoundTripAndCompare_IObjectRef()
     }
 
     [Fact]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_BasicPerSerializerRoundTripAndCompare_SampleTypes()
     {
         string assemblyName = typeof(DataContractSerializerTests).Assembly.FullName;
@@ -3858,7 +3858,7 @@ public static void DCS_BasicPerSerializerRoundTripAndCompare_SelfRefCycles()
     }
 
     [Fact]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_BasicPerSerializerRoundTripAndCompare_EnumStruct()
     {
         string assemblyName = typeof(DataContractSerializerTests).Assembly.FullName;
@@ -3942,7 +3942,7 @@ public static void DCS_BasicPerSerializerRoundTripAndCompare_EnumStruct()
     }
 
     [Fact]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_BasicPerSerializerRoundTripAndCompare_EnumStruct_NotNetFramework()
     {
         TestObjectInObjectContainerWithSimpleResolver(new SerializationTestTypes.AllTypes(), "<ObjectContainer xmlns=\"http://schemas.datacontract.org/2004/07/SerializationTestTypes\" xmlns:i=\"http://www.w3.org/2001/XMLSchema-instance\"><_data i:type=\"a:SerializationTestTypes.AllTypes***\" xmlns:a=\"http://schemas.datacontract.org/2004/07/SerializationTestTypes.AllTypes***\"><a>false</a><array1><anyType xmlns=\"http://schemas.microsoft.com/2003/10/Serialization/Arrays\"/><anyType xmlns=\"http://schemas.microsoft.com/2003/10/Serialization/Arrays\"/><anyType xmlns=\"http://schemas.microsoft.com/2003/10/Serialization/Arrays\"/></array1><b>255</b><c>0</c><d>65535</d><e>79228162514264337593543950335</e><enumArrayData><MyEnum1>red</MyEnum1></enumArrayData><enumBase1 i:type=\"b:SerializationTestTypes.MyEnum1***\" xmlns:b=\"http://schemas.datacontract.org/2004/07/SerializationTestTypes.MyEnum1***\">red</enumBase1><f>-1</f><f5>0001-01-01T00:00:00</f5><g>-79228162514264337593543950335</g><guidData>5642b5d2-87c3-a724-2390-997062f3f7a2</guidData><h>1</h><i>0</i><j>0</j><k>0</k><l>5E-324</l><lDTO xmlns:b=\"http://schemas.datacontract.org/2004/07/System\"/><m>1.7976931348623157E+308</m><n>-1.7976931348623157E+308</n><nDTO xmlns:b=\"http://schemas.datacontract.org/2004/07/System\"><b:DateTime>9999-12-31T23:59:59.9999999Z</b:DateTime><b:OffsetMinutes>0</b:OffsetMinutes></nDTO><o>NaN</o><obj/><p>-INF</p><q>INF</q><r>0</r><s>1E-45</s><strData i:nil=\"true\"/><t>-3.4028235E+38</t><timeSpan i:type=\"b:duration\" xmlns:b=\"http://schemas.microsoft.com/2003/10/Serialization/\">P10675199DT2H48M5.4775807S</timeSpan><u>3.4028235E+38</u><uri>http://www.microsoft.com/</uri><v>NaN</v><valType i:type=\"PublicDCStruct\"><Data>Data</Data></valType><w>-INF</w><x>INF</x><q:xmlQualifiedName xmlns:q=\"http://schemas.datacontract.org/2004/07/SerializationTestTypes\" xmlns:b=\"http://www.microsoft.com\">b:WCF</q:xmlQualifiedName><y>0</y><z>2147483647</z><z1>-2147483648</z1><z2>0</z2><z3>9223372036854775807</z3><z4>-9223372036854775808</z4><z5/><z6>0</z6><z7>127</z7><z8>-128</z8><z9>0</z9><z91>32767</z91><z92>-32768</z92><z93>abc</z93><z94>0</z94><z95>65535</z95><z96>0</z96><z97>0</z97><z98>4294967295</z98><z99>0</z99><z990>0</z990><z991>18446744073709551615</z991><z992>0</z992></_data><_data2 i:type=\"a:SerializationTestTypes.AllTypes***\" xmlns:a=\"http://schemas.datacontract.org/2004/07/SerializationTestTypes.AllTypes***\"><a>false</a><array1><anyType xmlns=\"http://schemas.microsoft.com/2003/10/Serialization/Arrays\"/><anyType xmlns=\"http://schemas.microsoft.com/2003/10/Serialization/Arrays\"/><anyType xmlns=\"http://schemas.microsoft.com/2003/10/Serialization/Arrays\"/></array1><b>255</b><c>0</c><d>65535</d><e>79228162514264337593543950335</e><enumArrayData><MyEnum1>red</MyEnum1></enumArrayData><enumBase1 i:type=\"b:SerializationTestTypes.MyEnum1***\" xmlns:b=\"http://schemas.datacontract.org/2004/07/SerializationTestTypes.MyEnum1***\">red</enumBase1><f>-1</f><f5>0001-01-01T00:00:00</f5><g>-79228162514264337593543950335</g><guidData>5642b5d2-87c3-a724-2390-997062f3f7a2</guidData><h>1</h><i>0</i><j>0</j><k>0</k><l>5E-324</l><lDTO xmlns:b=\"http://schemas.datacontract.org/2004/07/System\"/><m>1.7976931348623157E+308</m><n>-1.7976931348623157E+308</n><nDTO xmlns:b=\"http://schemas.datacontract.org/2004/07/System\"><b:DateTime>9999-12-31T23:59:59.9999999Z</b:DateTime><b:OffsetMinutes>0</b:OffsetMinutes></nDTO><o>NaN</o><obj/><p>-INF</p><q>INF</q><r>0</r><s>1E-45</s><strData i:nil=\"true\"/><t>-3.4028235E+38</t><timeSpan i:type=\"b:duration\" xmlns:b=\"http://schemas.microsoft.com/2003/10/Serialization/\">P10675199DT2H48M5.4775807S</timeSpan><u>3.4028235E+38</u><uri>http://www.microsoft.com/</uri><v>NaN</v><valType i:type=\"PublicDCStruct\"><Data>Data</Data></valType><w>-INF</w><x>INF</x><q:xmlQualifiedName xmlns:q=\"http://schemas.datacontract.org/2004/07/SerializationTestTypes\" xmlns:b=\"http://www.microsoft.com\">b:WCF</q:xmlQualifiedName><y>0</y><z>2147483647</z><z1>-2147483648</z1><z2>0</z2><z3>9223372036854775807</z3><z4>-9223372036854775808</z4><z5/><z6>0</z6><z7>127</z7><z8>-128</z8><z9>0</z9><z91>32767</z91><z92>-32768</z92><z93>abc</z93><z94>0</z94><z95>65535</z95><z96>0</z96><z97>0</z97><z98>4294967295</z98><z99>0</z99><z990>0</z990><z991>18446744073709551615</z991><z992>0</z992></_data2></ObjectContainer>");
@@ -4040,7 +4040,7 @@ public static void DCS_KnownSerializableTypes_Stack()
     }
 
     [Fact]
-    [ActiveIssue("No issue filed yet. Turns out, CultureInfo is not serialzable, even if it is included in s_knownSerializableTypeInfos")]
+    //[ActiveIssue("No issue filed yet. Turns out, CultureInfo is not serialzable, even if it is included in s_knownSerializableTypeInfos")]
     public static void DCS_KnownSerializableTypes_CultureInfo()
     {
         CultureInfo ci = new CultureInfo("pl");
@@ -4083,7 +4083,7 @@ public static void DCS_KnownSerializableTypes_Tuples()
     }
 
     [Fact]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_TypeWithVirtualGenericProperty()
     {
         var value1 = new TypeWithVirtualGenericProperty<int>() { Value = 1 };
@@ -4123,7 +4123,7 @@ public static void DCS_MyPersonSurrogate()
     }
 
     [Fact]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/85690", TestPlatforms.Wasi)]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/85690", TestPlatforms.Wasi)]
     public static void DCS_FileStreamSurrogate()
     {
         using (var testFile = TempFile.Create())
@@ -4190,9 +4190,9 @@ public static void DCS_SampleICollectionTExplicitWithoutDC()
     }
 
     [Fact]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsBrowser))]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsWasi))]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsMonoRuntime), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsAppleMobile))]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsBrowser))]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsWasi))]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsMonoRuntime), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsAppleMobile))]
     public static void DCS_MemoryStream_Serialize_UsesBuiltInAdapter()
     {
         ValidateObject(
@@ -4251,9 +4251,9 @@ static void ValidateObject(MemoryStream original, string expectedXml, byte[] exp
     }
 
     [Fact]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsBrowser))]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsWasi))]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsMonoRuntime), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsAppleMobile))]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsBrowser))]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsWasi))]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsMonoRuntime), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsAppleMobile))]
     public static void DCS_MemoryStream_Deserialize_CompatibleWithFullFramework()
     {
         // The payloads in this test were generated by a Full Framework application.
@@ -4405,7 +4405,7 @@ public static void DCS_ValidateExceptionOnUnspecifiedRootSerializationType()
     }
 
     [Fact]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_TypeWithCollectionAndDateTimeOffset()
     {
         // Adding offsetMinutes so the DateTime component in serialized strings are time-zone independent
@@ -4421,7 +4421,7 @@ public static void DCS_TypeWithCollectionAndDateTimeOffset()
     }
 
     [Fact]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_TypeWithCollectionAndDateTimeOffset_ListIsNull()
     {
         // Adding offsetMinutes so the DateTime component in serialized strings are time-zone independent
diff --git a/src/libraries/System.Runtime.Serialization.Xml/tests/DataContractSerializerStressTests.cs b/src/libraries/System.Runtime.Serialization.Xml/tests/DataContractSerializerStressTests.cs
index 694460ebb0b419..333cd8fad8519c 100644
--- a/src/libraries/System.Runtime.Serialization.Xml/tests/DataContractSerializerStressTests.cs
+++ b/src/libraries/System.Runtime.Serialization.Xml/tests/DataContractSerializerStressTests.cs
@@ -10,7 +10,7 @@
 public static partial class DataContractSerializerTests
 {
     [Fact]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/34962", TestRuntimes.Mono)]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/34962", TestRuntimes.Mono)]
     public static void DCS_MyPersonSurrogate_Stress()
     {
         // This test is to verify a bug fix made in ObjectToIdCache.cs.
diff --git a/src/libraries/System.Runtime.Serialization.Xml/tests/XmlDictionaryWriterTest.cs b/src/libraries/System.Runtime.Serialization.Xml/tests/XmlDictionaryWriterTest.cs
index 59e6be759b4a09..9e778a9e39f0fd 100644
--- a/src/libraries/System.Runtime.Serialization.Xml/tests/XmlDictionaryWriterTest.cs
+++ b/src/libraries/System.Runtime.Serialization.Xml/tests/XmlDictionaryWriterTest.cs
@@ -495,7 +495,7 @@ void AssertBytesWritten(Action<XmlDictionaryWriter> action, XmlBinaryNodeType no
     }
 
     [Fact]
-    [ActiveIssue("https://github.com/dotnet/runtime/issues/85013", typeof(PlatformDetection), nameof(PlatformDetection.IsBrowser), nameof(PlatformDetection.IsMonoAOT))]
+    //[ActiveIssue("https://github.com/dotnet/runtime/issues/85013", typeof(PlatformDetection), nameof(PlatformDetection.IsBrowser), nameof(PlatformDetection.IsMonoAOT))]
     public static void XmlBaseWriter_WriteString()
     {
         const byte Chars8Text = 152;
diff --git a/src/libraries/System.Runtime.Serialization.Xml/tests/XsdDataContractExporterTests/ExporterApiTests.cs b/src/libraries/System.Runtime.Serialization.Xml/tests/XsdDataContractExporterTests/ExporterApiTests.cs
index 32d4a70533b514..9d399730e5ed46 100644
--- a/src/libraries/System.Runtime.Serialization.Xml/tests/XsdDataContractExporterTests/ExporterApiTests.cs
+++ b/src/libraries/System.Runtime.Serialization.Xml/tests/XsdDataContractExporterTests/ExporterApiTests.cs
@@ -87,9 +87,9 @@ public static IEnumerable<object[]> CanExport_MemberData()
         }
 
         [Theory]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsBrowser))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsWasi))]
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsMonoRuntime), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsAppleMobile))]
+        //[ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsBrowser))]
+        //[ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsWasi))]
+        //[ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsMonoRuntime), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsAppleMobile))]
         [MemberData(nameof(Export_MemberData))]
         public void Export(string testname, Action<XsdDataContractExporter> export, Action<string, XmlSchemaSet> schemaCheck = null)
         {
diff --git a/src/libraries/System.Runtime.Serialization.Xml/tests/XsdDataContractExporterTests/ExporterTypesTests.cs b/src/libraries/System.Runtime.Serialization.Xml/tests/XsdDataContractExporterTests/ExporterTypesTests.cs
index 9dab40e4793b72..6cfea291d94768 100644
--- a/src/libraries/System.Runtime.Serialization.Xml/tests/XsdDataContractExporterTests/ExporterTypesTests.cs
+++ b/src/libraries/System.Runtime.Serialization.Xml/tests/XsdDataContractExporterTests/ExporterTypesTests.cs
@@ -81,7 +81,7 @@ public static IEnumerable<object[]> GetDynamicallyVersionedTypesTestNegativeData
 
         [ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.DataSetXmlSerializationIsSupported))]
         [SkipOnPlatform(TestPlatforms.Browser, "Inconsistent and unpredictable results.")]  // TODO - Why does 'TypeWithReadWriteCollectionAndNoCtorOnCollection' only cause an exception sometimes, but not all the time? What's special about wasm here?
-        [ActiveIssue("https://github.com/dotnet/runtime/issues/82967", TestPlatforms.Wasi)]
+        //[ActiveIssue("https://github.com/dotnet/runtime/issues/82967", TestPlatforms.Wasi)]
         [InlineData(typeof(NoDataContractWithoutParameterlessConstructor), typeof(InvalidDataContractException), @"Type 'System.Runtime.Serialization.Xml.XsdDataContractExporterTests.ExporterTypesTests+NoDataContractWithoutParameterlessConstructor' cannot be serialized. Consider marking it with the DataContractAttribute attribute, and marking all of its members you want serialized with the DataMemberAttribute attribute. Alternatively, you can ensure that the type is public and has a parameterless constructor - all public members of the type will then be serialized, and no attributes will be required.")]
         [InlineData(typeof(DataContractWithInvalidMember), typeof(InvalidDataContractException), @"Type 'System.Runtime.Serialization.Xml.XsdDataContractExporterTests.ExporterTypesTests+NoDataContractWithoutParameterlessConstructor' cannot be serialized. Consider marking it with the DataContractAttribute attribute, and marking all of its members you want serialized with the DataMemberAttribute attribute. Alternatively, you can ensure that the type is public and has a parameterless constructor - all public members of the type will then be serialized, and no attributes will be required.")]
         [InlineData(typeof(SerializableWithInvalidMember), typeof(InvalidDataContractException), @"Type 'System.Runtime.Serialization.Xml.XsdDataContractExporterTests.ExporterTypesTests+NoDataContractWithoutParameterlessConstructor' cannot be serialized. Consider marking it with the DataContractAttribute attribute, and marking all of its members you want serialized with the DataMemberAttribute attribute. Alternatively, you can ensure that the type is public and has a parameterless constructor - all public members of the type will then be serialized, and no attributes will be required.")]

From 82850b5f4c7766a5cabedc76198d132ccd3399d6 Mon Sep 17 00:00:00 2001
From: Steve Molloy <smolloy@microsoft.com>
Date: Mon, 4 Aug 2025 12:59:20 -0700
Subject: [PATCH 2/2] Remove commented 'ActiveIssues' for tests that are
 confirmed passing now.

---
 .../XmlSerializerTests.RuntimeOnly.cs         |  3 ---
 .../tests/XmlSerializer/XmlSerializerTests.cs |  6 +----
 .../Serialization/Schema/RoundTripTest.cs     |  3 ++-
 .../tests/DataContractSerializer.cs           | 25 +++++--------------
 .../DataContractSerializerStressTests.cs      |  1 -
 .../tests/XmlDictionaryWriterTest.cs          |  1 -
 .../ExporterApiTests.cs                       |  1 +
 .../ExporterTypesTests.cs                     |  3 ++-
 8 files changed, 12 insertions(+), 31 deletions(-)

diff --git a/src/libraries/System.Private.Xml/tests/XmlSerializer/XmlSerializerTests.RuntimeOnly.cs b/src/libraries/System.Private.Xml/tests/XmlSerializer/XmlSerializerTests.RuntimeOnly.cs
index 4eea1511567311..dfb044047e5961 100644
--- a/src/libraries/System.Private.Xml/tests/XmlSerializer/XmlSerializerTests.RuntimeOnly.cs
+++ b/src/libraries/System.Private.Xml/tests/XmlSerializer/XmlSerializerTests.RuntimeOnly.cs
@@ -3196,7 +3196,6 @@ public static void XmlMembersMapping_Soap_MultipleMembers_IsReturnValue()
     }
 
     [Fact]
-    //[ActiveIssue("https://github.com/dotnet/runtime/issues/1395")]
     public static void Xml_TypeWithReadOnlyMyCollectionProperty()
     {
         var value = new TypeWithReadOnlyMyCollectionProperty();
@@ -3366,7 +3365,6 @@ public static void Xml_NookTypes()
     }
 
     [Fact]
-    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DerivedTypeWithDifferentOverrides()
     {
         DerivedTypeWithDifferentOverrides value = new DerivedTypeWithDifferentOverrides() { Name1 = "Name1", Name2 = "Name2", Name3 = "Name3", Name4 = "Name4", Name5 = "Name5" };
@@ -3379,7 +3377,6 @@ public static void DerivedTypeWithDifferentOverrides()
     }
 
     [Fact]
-    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DerivedTypeWithDifferentOverrides2()
     {
         DerivedTypeWithDifferentOverrides2 value = new DerivedTypeWithDifferentOverrides2() { Name1 = "Name1", Name2 = "Name2", Name3 = "Name3", Name4 = "Name4", Name5 = "Name5", Name6 = "Name6", Name7 = "Name7" };
diff --git a/src/libraries/System.Private.Xml/tests/XmlSerializer/XmlSerializerTests.cs b/src/libraries/System.Private.Xml/tests/XmlSerializer/XmlSerializerTests.cs
index a829a5fc7875f3..aa16bba3ec61f3 100644
--- a/src/libraries/System.Private.Xml/tests/XmlSerializer/XmlSerializerTests.cs
+++ b/src/libraries/System.Private.Xml/tests/XmlSerializer/XmlSerializerTests.cs
@@ -43,7 +43,6 @@ static XmlSerializerTests()
     }
 #endif
 
-    // TODO smolloy - look into this. See simple repro at C:\Users\smolloy\source\play\XmlSerializerDefaultAttributeTrimmed - play with DefaultValueAttributeSupport property
     public static bool DefaultValueAttributeIsSupported => AppContext.TryGetSwitch("System.ComponentModel.DefaultValueAttribute.IsSupported", out bool isEnabled) ? isEnabled : true;
 
     [Fact]
@@ -266,7 +265,6 @@ public static void Xml_ListRoot()
     // horizon that it's not worth the trouble.
 #if !XMLSERIALIZERGENERATORTESTS
     [Fact]
-//    [ActiveIssue("https://github.com/dotnet/runtime/issues/74247", TestPlatforms.tvOS)]
     public static void Xml_ReadOnlyCollection()
     {
         ReadOnlyCollection<string> roc = new ReadOnlyCollection<string>(new string[] { "one", "two" });
@@ -288,7 +286,6 @@ public static void Xml_ReadOnlyCollection()
 
     [Theory]
     [MemberData(nameof(Xml_ImmutableCollections_MemberData))]
-    //[ActiveIssue("https://github.com/dotnet/runtime/issues/74247", TestPlatforms.tvOS)]
     public static void Xml_ImmutableCollections(Type type, object collection, Type createException, Type addException, string expectedXml, string exMsg = null)
     {
         XmlSerializer serializer;
@@ -2310,8 +2307,7 @@ public static void Xml_TypeWithSpecialCharacterInStringMember()
     // loaded in the default ALC, which causes problems for this test.
     [SkipOnPlatform(TestPlatforms.Browser, "AssemblyDependencyResolver not supported in wasm")]
 #endif
-//    [ActiveIssue("34072", TestRuntimes.Mono)]
-//    [ActiveIssue("https://github.com/dotnet/runtime/issues/96799", typeof(PlatformDetection), nameof(PlatformDetection.IsReadyToRunCompiled))]
+    [ActiveIssue("https://github.com/dotnet/runtime/issues/34072", TestRuntimes.Mono)]
     public static void Xml_TypeInCollectibleALC()
     {
         ExecuteAndUnload("SerializableAssembly.dll", "SerializationTypes.SimpleType", out var weakRef);
diff --git a/src/libraries/System.Runtime.Serialization.Schema/tests/System/Runtime/Serialization/Schema/RoundTripTest.cs b/src/libraries/System.Runtime.Serialization.Schema/tests/System/Runtime/Serialization/Schema/RoundTripTest.cs
index 5ec2098c11b805..e9b3b5cf2c8277 100644
--- a/src/libraries/System.Runtime.Serialization.Schema/tests/System/Runtime/Serialization/Schema/RoundTripTest.cs
+++ b/src/libraries/System.Runtime.Serialization.Schema/tests/System/Runtime/Serialization/Schema/RoundTripTest.cs
@@ -22,6 +22,8 @@ public RoundTripTest(ITestOutputHelper output)
         }
 
         [Fact]
+        // Passes on some wasm, but not all? Seems to have both passed and failed on the same browser/wasm/OS/Mono-CoreCLR combo in the same pipeline? How does that happen? Is this trimming related?
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming))]
         //[ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsBrowser))]
         //[ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsMonoRuntime), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsAppleMobile))]
         public void RountTripTest()
@@ -81,7 +83,6 @@ public void RountTripTest()
         }
 
         [Fact]
-        //[ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsBrowser))]
         public void RoundTripXmlSerializableWithSpecialAttributesTest()
         {
             XsdDataContractExporter exporter = new XsdDataContractExporter();
diff --git a/src/libraries/System.Runtime.Serialization.Xml/tests/DataContractSerializer.cs b/src/libraries/System.Runtime.Serialization.Xml/tests/DataContractSerializer.cs
index e0144a928e50be..5df5f9d9707cb3 100644
--- a/src/libraries/System.Runtime.Serialization.Xml/tests/DataContractSerializer.cs
+++ b/src/libraries/System.Runtime.Serialization.Xml/tests/DataContractSerializer.cs
@@ -35,7 +35,6 @@ static DataContractSerializerTests()
     }
 #endif
     [Fact]
-    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_DateTimeOffsetAsRoot()
     {
         // Assume that UTC offset doesn't change more often than once in the day 2013-01-02
@@ -1094,7 +1093,6 @@ public static void DCS_WithListOfXElement()
     }
 
     [Fact]
-    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_DerivedTypeWithDifferentOverrides()
     {
         var x = new DerivedTypeWithDifferentOverrides() { Name1 = "Name1", Name2 = "Name2", Name3 = "Name3", Name4 = "Name4", Name5 = "Name5" };
@@ -1122,7 +1120,7 @@ public static void DCS_TypeNamesWithSpecialCharacters()
     // loaded in the default ALC, which causes problems for this test.
     [SkipOnPlatform(TestPlatforms.Browser, "AssemblyDependencyResolver not supported in wasm")]
 #endif
-    //[ActiveIssue("34072", TestRuntimes.Mono)]
+    [ActiveIssue("https://github.com/dotnet/runtime/issues/34072", TestRuntimes.Mono)]
     public static void DCS_TypeInCollectibleALC()
     {
         ExecuteAndUnload("SerializableAssembly.dll", "SerializationTypes.SimpleType", makeCollection: false, out var weakRef);
@@ -1141,7 +1139,7 @@ public static void DCS_TypeInCollectibleALC()
     // loaded in the default ALC, which causes problems for this test.
     [SkipOnPlatform(TestPlatforms.Browser, "AssemblyDependencyResolver not supported in wasm")]
 #endif
-    //[ActiveIssue("34072", TestRuntimes.Mono)]
+    [ActiveIssue("https://github.com/dotnet/runtime/issues/34072", TestRuntimes.Mono)]
     public static void DCS_CollectionTypeInCollectibleALC()
     {
         ExecuteAndUnload("SerializableAssembly.dll", "SerializationTypes.SimpleType", makeCollection: true, out var weakRef);
@@ -1374,7 +1372,6 @@ public static void DCS_EnumFlags()
     }
 
     [Fact]
-    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_SerializeClassThatImplementsInterface()
     {
         ClassImplementsInterface value = new ClassImplementsInterface() { ClassID = "ClassID", DisplayName = "DisplayName", Id = "Id", IsLoaded = true };
@@ -1529,7 +1526,6 @@ public static void DCS_KnownTypesThroughConstructor()
     }
 
     [Fact]
-    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_DuplicatedKnownTypesWithAdapterThroughConstructor()
     {
         //Constructor# 5
@@ -1657,7 +1653,6 @@ public static void DCS_TypeWithUriTypeProperty()
     }
 
     [Fact]
-    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_TypeWithDatetimeOffsetTypeProperty()
     {
         var value = new TypeWithDateTimeOffsetTypeProperty() { ModifiedTime = new DateTimeOffset(new DateTime(2013, 1, 2, 3, 4, 5, 6, DateTimeKind.Utc)) };
@@ -1876,7 +1871,6 @@ public static void DCS_TypeWithGenericDictionaryAsKnownType()
     }
 
     [Fact]
-    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_TypeWithKnownTypeAttributeAndInterfaceMember()
     {
         TypeWithKnownTypeAttributeAndInterfaceMember value = new TypeWithKnownTypeAttributeAndInterfaceMember();
@@ -1888,7 +1882,6 @@ public static void DCS_TypeWithKnownTypeAttributeAndInterfaceMember()
     }
 
     [Fact]
-    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_TypeWithKnownTypeAttributeAndListOfInterfaceMember()
     {
         TypeWithKnownTypeAttributeAndListOfInterfaceMember value = new TypeWithKnownTypeAttributeAndListOfInterfaceMember();
@@ -1987,7 +1980,6 @@ public static void DCS_GenericTypeWithNestedGenerics()
     }
 
     [Fact]
-    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_DuplicatedKeyDateTimeOffset()
     {
         DateTimeOffset value = new DateTimeOffset(new DateTime(2013, 1, 2, 3, 4, 5, 6, DateTimeKind.Utc).AddMinutes(7));
@@ -2735,7 +2727,6 @@ public static void DCS_NonGenericDictionaryOfStringInt32()
 #endregion
 
     [Fact]
-    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_BasicRoundTripResolveDTOTypes()
     {
         ObjectContainer instance = new ObjectContainer(new DTOContainer());
@@ -2971,7 +2962,6 @@ private static void DCS_BasicRoundTripResolvePrimitiveTypes(string baseline)
     /// Resolver is plugged in and resolves the primitive types. Verify resolver called during ser and deser
     /// </summary>
     [Fact]
-    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_BasicRoundTripResolvePrimitiveTypes_NotNetFramework()
     {
         string baseline = @"<ObjectContainer xmlns=""http://schemas.datacontract.org/2004/07/SerializationTestTypes"" xmlns:i=""http://www.w3.org/2001/XMLSchema-instance""><_data i:type=""a:PrimitiveContainer_foo"" xmlns:a=""http://www.default.com""><a i:type=""a:Boolean_foo"">false</a><array1><anyType xmlns=""http://schemas.microsoft.com/2003/10/Serialization/Arrays""/><anyType xmlns=""http://schemas.microsoft.com/2003/10/Serialization/Arrays""/><anyType xmlns=""http://schemas.microsoft.com/2003/10/Serialization/Arrays""/></array1><b i:type=""a:Byte_foo"">255</b><c i:type=""a:Byte_foo"">0</c><d i:type=""a:Char_foo"">65535</d><e i:type=""a:Decimal_foo"">79228162514264337593543950335</e><f i:type=""a:Decimal_foo"">-1</f><f5 i:type=""a:DateTime_foo"">9999-12-31T23:59:59.9999999</f5><g i:type=""a:Decimal_foo"">-79228162514264337593543950335</g><guidData i:type=""a:Guid_foo"">4bc848b1-a541-40bf-8aa9-dd6ccb6d0e56</guidData><h i:type=""a:Decimal_foo"">1</h><i i:type=""a:Decimal_foo"">0</i><j i:type=""a:Decimal_foo"">0</j><k i:type=""a:Double_foo"">0</k><l i:type=""a:Double_foo"">5E-324</l><lDTO xmlns:b=""http://schemas.datacontract.org/2004/07/System""/><m i:type=""a:Double_foo"">1.7976931348623157E+308</m><n i:type=""a:Double_foo"">-1.7976931348623157E+308</n><nDTO i:type=""a:DateTimeOffset_foo""><DateTime xmlns=""http://schemas.datacontract.org/2004/07/System"">9999-12-31T23:59:59.9999999Z</DateTime><OffsetMinutes xmlns=""http://schemas.datacontract.org/2004/07/System"">0</OffsetMinutes></nDTO><o i:type=""a:Double_foo"">NaN</o><obj/><p i:type=""a:Double_foo"">-INF</p><q i:type=""a:Double_foo"">INF</q><r i:type=""a:Single_foo"">0</r><s i:type=""a:Single_foo"">1E-45</s><strData i:nil=""true""/><t i:type=""a:Single_foo"">-3.4028235E+38</t><timeSpan i:type=""a:TimeSpan_foo"">P10675199DT2H48M5.4775807S</timeSpan><u i:type=""a:Single_foo"">3.4028235E+38</u><uri>http://www.microsoft.com/</uri><v i:type=""a:Single_foo"">NaN</v><w i:type=""a:Single_foo"">-INF</w><x i:type=""a:Single_foo"">INF</x><xmlQualifiedName i:type=""a:XmlQualifiedName_foo"" xmlns:b=""http://www.microsoft.com"">b:WCF</xmlQualifiedName><y i:type=""a:Int32_foo"">0</y><z i:type=""a:Int32_foo"">2147483647</z><z1 i:type=""a:Int32_foo"">-2147483648</z1><z2 i:type=""a:Int64_foo"">0</z2><z3 i:type=""a:Int64_foo"">9223372036854775807</z3><z4 i:type=""a:Int64_foo"">-9223372036854775808</z4><z5/><z6 i:type=""a:SByte_foo"">0</z6><z7 i:type=""a:SByte_foo"">127</z7><z8 i:type=""a:SByte_foo"">-128</z8><z9 i:type=""a:Int16_foo"">0</z9><z91 i:type=""a:Int16_foo"">32767</z91><z92 i:type=""a:Int16_foo"">-32768</z92><z93 i:type=""a:String_foo"">abc</z93><z94 i:type=""a:UInt16_foo"">0</z94><z95 i:type=""a:UInt16_foo"">65535</z95><z96 i:type=""a:UInt16_foo"">0</z96><z97 i:type=""a:UInt32_foo"">0</z97><z98 i:type=""a:UInt32_foo"">4294967295</z98><z99 i:type=""a:UInt32_foo"">0</z99><z990 i:type=""a:UInt64_foo"">0</z990><z991 i:type=""a:UInt64_foo"">18446744073709551615</z991><z992 i:type=""a:UInt64_foo"">0</z992><z993>AQIDBA==</z993></_data><_data2 i:type=""a:PrimitiveContainer_foo"" xmlns:a=""http://www.default.com""><a i:type=""a:Boolean_foo"">false</a><array1><anyType xmlns=""http://schemas.microsoft.com/2003/10/Serialization/Arrays""/><anyType xmlns=""http://schemas.microsoft.com/2003/10/Serialization/Arrays""/><anyType xmlns=""http://schemas.microsoft.com/2003/10/Serialization/Arrays""/></array1><b i:type=""a:Byte_foo"">255</b><c i:type=""a:Byte_foo"">0</c><d i:type=""a:Char_foo"">65535</d><e i:type=""a:Decimal_foo"">79228162514264337593543950335</e><f i:type=""a:Decimal_foo"">-1</f><f5 i:type=""a:DateTime_foo"">9999-12-31T23:59:59.9999999</f5><g i:type=""a:Decimal_foo"">-79228162514264337593543950335</g><guidData i:type=""a:Guid_foo"">4bc848b1-a541-40bf-8aa9-dd6ccb6d0e56</guidData><h i:type=""a:Decimal_foo"">1</h><i i:type=""a:Decimal_foo"">0</i><j i:type=""a:Decimal_foo"">0</j><k i:type=""a:Double_foo"">0</k><l i:type=""a:Double_foo"">5E-324</l><lDTO xmlns:b=""http://schemas.datacontract.org/2004/07/System""/><m i:type=""a:Double_foo"">1.7976931348623157E+308</m><n i:type=""a:Double_foo"">-1.7976931348623157E+308</n><nDTO i:type=""a:DateTimeOffset_foo""><DateTime xmlns=""http://schemas.datacontract.org/2004/07/System"">9999-12-31T23:59:59.9999999Z</DateTime><OffsetMinutes xmlns=""http://schemas.datacontract.org/2004/07/System"">0</OffsetMinutes></nDTO><o i:type=""a:Double_foo"">NaN</o><obj/><p i:type=""a:Double_foo"">-INF</p><q i:type=""a:Double_foo"">INF</q><r i:type=""a:Single_foo"">0</r><s i:type=""a:Single_foo"">1E-45</s><strData i:nil=""true""/><t i:type=""a:Single_foo"">-3.4028235E+38</t><timeSpan i:type=""a:TimeSpan_foo"">P10675199DT2H48M5.4775807S</timeSpan><u i:type=""a:Single_foo"">3.4028235E+38</u><uri>http://www.microsoft.com/</uri><v i:type=""a:Single_foo"">NaN</v><w i:type=""a:Single_foo"">-INF</w><x i:type=""a:Single_foo"">INF</x><xmlQualifiedName i:type=""a:XmlQualifiedName_foo"" xmlns:b=""http://www.microsoft.com"">b:WCF</xmlQualifiedName><y i:type=""a:Int32_foo"">0</y><z i:type=""a:Int32_foo"">2147483647</z><z1 i:type=""a:Int32_foo"">-2147483648</z1><z2 i:type=""a:Int64_foo"">0</z2><z3 i:type=""a:Int64_foo"">9223372036854775807</z3><z4 i:type=""a:Int64_foo"">-9223372036854775808</z4><z5/><z6 i:type=""a:SByte_foo"">0</z6><z7 i:type=""a:SByte_foo"">127</z7><z8 i:type=""a:SByte_foo"">-128</z8><z9 i:type=""a:Int16_foo"">0</z9><z91 i:type=""a:Int16_foo"">32767</z91><z92 i:type=""a:Int16_foo"">-32768</z92><z93 i:type=""a:String_foo"">abc</z93><z94 i:type=""a:UInt16_foo"">0</z94><z95 i:type=""a:UInt16_foo"">65535</z95><z96 i:type=""a:UInt16_foo"">0</z96><z97 i:type=""a:UInt32_foo"">0</z97><z98 i:type=""a:UInt32_foo"">4294967295</z98><z99 i:type=""a:UInt32_foo"">0</z99><z990 i:type=""a:UInt64_foo"">0</z990><z991 i:type=""a:UInt64_foo"">18446744073709551615</z991><z992 i:type=""a:UInt64_foo"">0</z992><z993>AQIDBA==</z993></_data2></ObjectContainer>";
@@ -3217,7 +3207,6 @@ public static void DCS_BasicPerSerializerRoundTripAndCompare_IObjectRef()
     }
 
     [Fact]
-    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_BasicPerSerializerRoundTripAndCompare_SampleTypes()
     {
         string assemblyName = typeof(DataContractSerializerTests).Assembly.FullName;
@@ -3858,7 +3847,6 @@ public static void DCS_BasicPerSerializerRoundTripAndCompare_SelfRefCycles()
     }
 
     [Fact]
-    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_BasicPerSerializerRoundTripAndCompare_EnumStruct()
     {
         string assemblyName = typeof(DataContractSerializerTests).Assembly.FullName;
@@ -3942,7 +3930,6 @@ public static void DCS_BasicPerSerializerRoundTripAndCompare_EnumStruct()
     }
 
     [Fact]
-    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_BasicPerSerializerRoundTripAndCompare_EnumStruct_NotNetFramework()
     {
         TestObjectInObjectContainerWithSimpleResolver(new SerializationTestTypes.AllTypes(), "<ObjectContainer xmlns=\"http://schemas.datacontract.org/2004/07/SerializationTestTypes\" xmlns:i=\"http://www.w3.org/2001/XMLSchema-instance\"><_data i:type=\"a:SerializationTestTypes.AllTypes***\" xmlns:a=\"http://schemas.datacontract.org/2004/07/SerializationTestTypes.AllTypes***\"><a>false</a><array1><anyType xmlns=\"http://schemas.microsoft.com/2003/10/Serialization/Arrays\"/><anyType xmlns=\"http://schemas.microsoft.com/2003/10/Serialization/Arrays\"/><anyType xmlns=\"http://schemas.microsoft.com/2003/10/Serialization/Arrays\"/></array1><b>255</b><c>0</c><d>65535</d><e>79228162514264337593543950335</e><enumArrayData><MyEnum1>red</MyEnum1></enumArrayData><enumBase1 i:type=\"b:SerializationTestTypes.MyEnum1***\" xmlns:b=\"http://schemas.datacontract.org/2004/07/SerializationTestTypes.MyEnum1***\">red</enumBase1><f>-1</f><f5>0001-01-01T00:00:00</f5><g>-79228162514264337593543950335</g><guidData>5642b5d2-87c3-a724-2390-997062f3f7a2</guidData><h>1</h><i>0</i><j>0</j><k>0</k><l>5E-324</l><lDTO xmlns:b=\"http://schemas.datacontract.org/2004/07/System\"/><m>1.7976931348623157E+308</m><n>-1.7976931348623157E+308</n><nDTO xmlns:b=\"http://schemas.datacontract.org/2004/07/System\"><b:DateTime>9999-12-31T23:59:59.9999999Z</b:DateTime><b:OffsetMinutes>0</b:OffsetMinutes></nDTO><o>NaN</o><obj/><p>-INF</p><q>INF</q><r>0</r><s>1E-45</s><strData i:nil=\"true\"/><t>-3.4028235E+38</t><timeSpan i:type=\"b:duration\" xmlns:b=\"http://schemas.microsoft.com/2003/10/Serialization/\">P10675199DT2H48M5.4775807S</timeSpan><u>3.4028235E+38</u><uri>http://www.microsoft.com/</uri><v>NaN</v><valType i:type=\"PublicDCStruct\"><Data>Data</Data></valType><w>-INF</w><x>INF</x><q:xmlQualifiedName xmlns:q=\"http://schemas.datacontract.org/2004/07/SerializationTestTypes\" xmlns:b=\"http://www.microsoft.com\">b:WCF</q:xmlQualifiedName><y>0</y><z>2147483647</z><z1>-2147483648</z1><z2>0</z2><z3>9223372036854775807</z3><z4>-9223372036854775808</z4><z5/><z6>0</z6><z7>127</z7><z8>-128</z8><z9>0</z9><z91>32767</z91><z92>-32768</z92><z93>abc</z93><z94>0</z94><z95>65535</z95><z96>0</z96><z97>0</z97><z98>4294967295</z98><z99>0</z99><z990>0</z990><z991>18446744073709551615</z991><z992>0</z992></_data><_data2 i:type=\"a:SerializationTestTypes.AllTypes***\" xmlns:a=\"http://schemas.datacontract.org/2004/07/SerializationTestTypes.AllTypes***\"><a>false</a><array1><anyType xmlns=\"http://schemas.microsoft.com/2003/10/Serialization/Arrays\"/><anyType xmlns=\"http://schemas.microsoft.com/2003/10/Serialization/Arrays\"/><anyType xmlns=\"http://schemas.microsoft.com/2003/10/Serialization/Arrays\"/></array1><b>255</b><c>0</c><d>65535</d><e>79228162514264337593543950335</e><enumArrayData><MyEnum1>red</MyEnum1></enumArrayData><enumBase1 i:type=\"b:SerializationTestTypes.MyEnum1***\" xmlns:b=\"http://schemas.datacontract.org/2004/07/SerializationTestTypes.MyEnum1***\">red</enumBase1><f>-1</f><f5>0001-01-01T00:00:00</f5><g>-79228162514264337593543950335</g><guidData>5642b5d2-87c3-a724-2390-997062f3f7a2</guidData><h>1</h><i>0</i><j>0</j><k>0</k><l>5E-324</l><lDTO xmlns:b=\"http://schemas.datacontract.org/2004/07/System\"/><m>1.7976931348623157E+308</m><n>-1.7976931348623157E+308</n><nDTO xmlns:b=\"http://schemas.datacontract.org/2004/07/System\"><b:DateTime>9999-12-31T23:59:59.9999999Z</b:DateTime><b:OffsetMinutes>0</b:OffsetMinutes></nDTO><o>NaN</o><obj/><p>-INF</p><q>INF</q><r>0</r><s>1E-45</s><strData i:nil=\"true\"/><t>-3.4028235E+38</t><timeSpan i:type=\"b:duration\" xmlns:b=\"http://schemas.microsoft.com/2003/10/Serialization/\">P10675199DT2H48M5.4775807S</timeSpan><u>3.4028235E+38</u><uri>http://www.microsoft.com/</uri><v>NaN</v><valType i:type=\"PublicDCStruct\"><Data>Data</Data></valType><w>-INF</w><x>INF</x><q:xmlQualifiedName xmlns:q=\"http://schemas.datacontract.org/2004/07/SerializationTestTypes\" xmlns:b=\"http://www.microsoft.com\">b:WCF</q:xmlQualifiedName><y>0</y><z>2147483647</z><z1>-2147483648</z1><z2>0</z2><z3>9223372036854775807</z3><z4>-9223372036854775808</z4><z5/><z6>0</z6><z7>127</z7><z8>-128</z8><z9>0</z9><z91>32767</z91><z92>-32768</z92><z93>abc</z93><z94>0</z94><z95>65535</z95><z96>0</z96><z97>0</z97><z98>4294967295</z98><z99>0</z99><z990>0</z990><z991>18446744073709551615</z991><z992>0</z992></_data2></ObjectContainer>");
@@ -4040,9 +4027,10 @@ public static void DCS_KnownSerializableTypes_Stack()
     }
 
     [Fact]
-    //[ActiveIssue("No issue filed yet. Turns out, CultureInfo is not serialzable, even if it is included in s_knownSerializableTypeInfos")]
+    [ActiveIssue("https://github.com/dotnet/runtime/issues/118358")]
     public static void DCS_KnownSerializableTypes_CultureInfo()
     {
+        // Turns out, CultureInfo is not serialzable, even if it is included in s_knownSerializableTypeInfos
         CultureInfo ci = new CultureInfo("pl");
         Assert.StrictEqual(ci, DataContractSerializerHelper.SerializeAndDeserialize<CultureInfo>(ci, "", null, null, true));
     }
@@ -4083,7 +4071,6 @@ public static void DCS_KnownSerializableTypes_Tuples()
     }
 
     [Fact]
-    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_TypeWithVirtualGenericProperty()
     {
         var value1 = new TypeWithVirtualGenericProperty<int>() { Value = 1 };
@@ -4190,6 +4177,7 @@ public static void DCS_SampleICollectionTExplicitWithoutDC()
     }
 
     [Fact]
+    [ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming))]
     //[ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsBrowser))]
     //[ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsWasi))]
     //[ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsMonoRuntime), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsAppleMobile))]
@@ -4251,6 +4239,7 @@ static void ValidateObject(MemoryStream original, string expectedXml, byte[] exp
     }
 
     [Fact]
+    [ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming))]
     //[ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsBrowser))]
     //[ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsWasi))]
     //[ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsMonoRuntime), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsAppleMobile))]
@@ -4405,7 +4394,6 @@ public static void DCS_ValidateExceptionOnUnspecifiedRootSerializationType()
     }
 
     [Fact]
-    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_TypeWithCollectionAndDateTimeOffset()
     {
         // Adding offsetMinutes so the DateTime component in serialized strings are time-zone independent
@@ -4421,7 +4409,6 @@ public static void DCS_TypeWithCollectionAndDateTimeOffset()
     }
 
     [Fact]
-    //[ActiveIssue("https://github.com/dotnet/runtime/issues/60462", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public static void DCS_TypeWithCollectionAndDateTimeOffset_ListIsNull()
     {
         // Adding offsetMinutes so the DateTime component in serialized strings are time-zone independent
diff --git a/src/libraries/System.Runtime.Serialization.Xml/tests/DataContractSerializerStressTests.cs b/src/libraries/System.Runtime.Serialization.Xml/tests/DataContractSerializerStressTests.cs
index 333cd8fad8519c..c091ce99ab60cb 100644
--- a/src/libraries/System.Runtime.Serialization.Xml/tests/DataContractSerializerStressTests.cs
+++ b/src/libraries/System.Runtime.Serialization.Xml/tests/DataContractSerializerStressTests.cs
@@ -10,7 +10,6 @@
 public static partial class DataContractSerializerTests
 {
     [Fact]
-    //[ActiveIssue("https://github.com/dotnet/runtime/issues/34962", TestRuntimes.Mono)]
     public static void DCS_MyPersonSurrogate_Stress()
     {
         // This test is to verify a bug fix made in ObjectToIdCache.cs.
diff --git a/src/libraries/System.Runtime.Serialization.Xml/tests/XmlDictionaryWriterTest.cs b/src/libraries/System.Runtime.Serialization.Xml/tests/XmlDictionaryWriterTest.cs
index 9e778a9e39f0fd..8cd8f01e9f22e8 100644
--- a/src/libraries/System.Runtime.Serialization.Xml/tests/XmlDictionaryWriterTest.cs
+++ b/src/libraries/System.Runtime.Serialization.Xml/tests/XmlDictionaryWriterTest.cs
@@ -495,7 +495,6 @@ void AssertBytesWritten(Action<XmlDictionaryWriter> action, XmlBinaryNodeType no
     }
 
     [Fact]
-    //[ActiveIssue("https://github.com/dotnet/runtime/issues/85013", typeof(PlatformDetection), nameof(PlatformDetection.IsBrowser), nameof(PlatformDetection.IsMonoAOT))]
     public static void XmlBaseWriter_WriteString()
     {
         const byte Chars8Text = 152;
diff --git a/src/libraries/System.Runtime.Serialization.Xml/tests/XsdDataContractExporterTests/ExporterApiTests.cs b/src/libraries/System.Runtime.Serialization.Xml/tests/XsdDataContractExporterTests/ExporterApiTests.cs
index 9d399730e5ed46..eea6a7c7010613 100644
--- a/src/libraries/System.Runtime.Serialization.Xml/tests/XsdDataContractExporterTests/ExporterApiTests.cs
+++ b/src/libraries/System.Runtime.Serialization.Xml/tests/XsdDataContractExporterTests/ExporterApiTests.cs
@@ -87,6 +87,7 @@ public static IEnumerable<object[]> CanExport_MemberData()
         }
 
         [Theory]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming))]
         //[ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsBrowser))]
         //[ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsWasi))]
         //[ActiveIssue("https://github.com/dotnet/runtime/issues/73961", typeof(PlatformDetection), nameof(PlatformDetection.IsMonoRuntime), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming), nameof(PlatformDetection.IsAppleMobile))]
diff --git a/src/libraries/System.Runtime.Serialization.Xml/tests/XsdDataContractExporterTests/ExporterTypesTests.cs b/src/libraries/System.Runtime.Serialization.Xml/tests/XsdDataContractExporterTests/ExporterTypesTests.cs
index 6cfea291d94768..1056ac8261fd1e 100644
--- a/src/libraries/System.Runtime.Serialization.Xml/tests/XsdDataContractExporterTests/ExporterTypesTests.cs
+++ b/src/libraries/System.Runtime.Serialization.Xml/tests/XsdDataContractExporterTests/ExporterTypesTests.cs
@@ -80,8 +80,9 @@ public static IEnumerable<object[]> GetDynamicallyVersionedTypesTestNegativeData
         }
 
         [ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.DataSetXmlSerializationIsSupported))]
-        [SkipOnPlatform(TestPlatforms.Browser, "Inconsistent and unpredictable results.")]  // TODO - Why does 'TypeWithReadWriteCollectionAndNoCtorOnCollection' only cause an exception sometimes, but not all the time? What's special about wasm here?
+        //[SkipOnPlatform(TestPlatforms.Browser, "Inconsistent and unpredictable results.")]  // TODO - Why does 'TypeWithReadWriteCollectionAndNoCtorOnCollection' only cause an exception sometimes, but not all the time? What's special about wasm here?
         //[ActiveIssue("https://github.com/dotnet/runtime/issues/82967", TestPlatforms.Wasi)]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/82967", typeof(PlatformDetection), nameof(PlatformDetection.IsBuiltWithAggressiveTrimming))]
         [InlineData(typeof(NoDataContractWithoutParameterlessConstructor), typeof(InvalidDataContractException), @"Type 'System.Runtime.Serialization.Xml.XsdDataContractExporterTests.ExporterTypesTests+NoDataContractWithoutParameterlessConstructor' cannot be serialized. Consider marking it with the DataContractAttribute attribute, and marking all of its members you want serialized with the DataMemberAttribute attribute. Alternatively, you can ensure that the type is public and has a parameterless constructor - all public members of the type will then be serialized, and no attributes will be required.")]
         [InlineData(typeof(DataContractWithInvalidMember), typeof(InvalidDataContractException), @"Type 'System.Runtime.Serialization.Xml.XsdDataContractExporterTests.ExporterTypesTests+NoDataContractWithoutParameterlessConstructor' cannot be serialized. Consider marking it with the DataContractAttribute attribute, and marking all of its members you want serialized with the DataMemberAttribute attribute. Alternatively, you can ensure that the type is public and has a parameterless constructor - all public members of the type will then be serialized, and no attributes will be required.")]
         [InlineData(typeof(SerializableWithInvalidMember), typeof(InvalidDataContractException), @"Type 'System.Runtime.Serialization.Xml.XsdDataContractExporterTests.ExporterTypesTests+NoDataContractWithoutParameterlessConstructor' cannot be serialized. Consider marking it with the DataContractAttribute attribute, and marking all of its members you want serialized with the DataMemberAttribute attribute. Alternatively, you can ensure that the type is public and has a parameterless constructor - all public members of the type will then be serialized, and no attributes will be required.")]