diff --git a/src/libraries/System.Private.Xml/tests/XmlReader/XmlResolver/XmlSystemPathResolverTests.cs b/src/libraries/System.Private.Xml/tests/XmlReader/XmlResolver/XmlSystemPathResolverTests.cs
index f08908a6288b6c..32c6857958eab7 100644
--- a/src/libraries/System.Private.Xml/tests/XmlReader/XmlResolver/XmlSystemPathResolverTests.cs
+++ b/src/libraries/System.Private.Xml/tests/XmlReader/XmlResolver/XmlSystemPathResolverTests.cs
@@ -93,6 +93,7 @@ public static void TestResolveInvalidPaths()
         [InlineData("http://notfound.invalid.corp.microsoft.com")]
         [InlineData("ftp://host.invalid")]
         [InlineData("notsupported://host.invalid")]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/75129", TestPlatforms.Browser)]
         public static void TestResolveInvalidPath(string invalidUri)
         {
             Assert.ThrowsAny<Exception>(() => XmlReader.Create(invalidUri));
diff --git a/src/libraries/System.Private.Xml/tests/XmlSchema/XmlSchemaSet/TC_SchemaSet_Add_URL.cs b/src/libraries/System.Private.Xml/tests/XmlSchema/XmlSchemaSet/TC_SchemaSet_Add_URL.cs
index 1ac38f760b5239..72dd047b0a4757 100644
--- a/src/libraries/System.Private.Xml/tests/XmlSchema/XmlSchemaSet/TC_SchemaSet_Add_URL.cs
+++ b/src/libraries/System.Private.Xml/tests/XmlSchema/XmlSchemaSet/TC_SchemaSet_Add_URL.cs
@@ -64,6 +64,7 @@ public void v3()
 
         //-----------------------------------------------------------------------------------
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/75123", TestPlatforms.Browser)]
         //[Variation(Desc = "v4 - ns = valid, URL = invalid")]
         public void v4()
         {
diff --git a/src/libraries/System.Private.Xml/tests/XmlSchema/XmlSchemaSet/TC_SchemaSet_XmlResolver.cs b/src/libraries/System.Private.Xml/tests/XmlSchema/XmlSchemaSet/TC_SchemaSet_XmlResolver.cs
index 63579a63cf4c3c..c8c7bff782eec2 100644
--- a/src/libraries/System.Private.Xml/tests/XmlSchema/XmlSchemaSet/TC_SchemaSet_XmlResolver.cs
+++ b/src/libraries/System.Private.Xml/tests/XmlSchema/XmlSchemaSet/TC_SchemaSet_XmlResolver.cs
@@ -89,6 +89,7 @@ public void v3()
 
         //[Variation(Desc = "v4 - schema(Local)->schema(Local)", Priority = 1)]
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/75183", TestPlatforms.Browser)]
         public void v4()
         {
             AppContext.SetSwitch("Switch.System.Xml.AllowDefaultResolver", true);
@@ -104,6 +105,7 @@ public void v4()
 
         //[Variation(Desc = "v5 - schema(Local)->schema(Local)->schema(Local)", Priority = 1)]
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/75183", TestPlatforms.Browser)]
         public void v5()
         {
             AppContext.SetSwitch("Switch.System.Xml.AllowDefaultResolver", true);
diff --git a/src/libraries/System.Private.Xml/tests/XmlSchema/XmlSchemaValidatorApi/ValidateMisc.cs b/src/libraries/System.Private.Xml/tests/XmlSchema/XmlSchemaValidatorApi/ValidateMisc.cs
index 17119ee0c131d4..79bfff03680428 100644
--- a/src/libraries/System.Private.Xml/tests/XmlSchema/XmlSchemaValidatorApi/ValidateMisc.cs
+++ b/src/libraries/System.Private.Xml/tests/XmlSchema/XmlSchemaValidatorApi/ValidateMisc.cs
@@ -420,6 +420,7 @@ public TCValidateAfterAddInvalidSchema(ITestOutputHelper output) : base(output)
         [InlineData("SCHEMA", "schB1_a.xsd", 1, 3, 3)]
         [InlineData("SCHEMA", "schM2_a.xsd", 1, 3, 3)]
         [InlineData("SCHEMA", "schH2_a.xsd", 1, 3, 3)]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/75132", TestPlatforms.Browser)]
         public void AddValid_Import_Include_Redefine(string testDir, string testFile, int expCount, int expCountGT, int expCountGE)
         {
             string xsd = Path.Combine(path, testDir, testFile);