diff --git a/src/UniTask/Assets/Tests/AsyncTest.cs b/src/UniTask/Assets/Tests/AsyncTest.cs
index 73a0564..c329dbf 100644
--- a/src/UniTask/Assets/Tests/AsyncTest.cs
+++ b/src/UniTask/Assets/Tests/AsyncTest.cs
@@ -55,6 +55,8 @@ namespace Cysharp.Threading.TasksTests
             }
         }
 
+#if !UNITY_WEBGL
+
         [UnityTest]
         public IEnumerator DelayAnd() => UniTask.ToCoroutine(async () =>
         {
@@ -76,6 +78,8 @@ namespace Cysharp.Threading.TasksTests
             }
         });
 
+#endif
+
         [UnityTest]
         public IEnumerator DelayIgnore() => UniTask.ToCoroutine(async () =>
         {
@@ -183,6 +187,8 @@ namespace Cysharp.Threading.TasksTests
             diff.Should().Be(11);
         });
 
+#if !UNITY_WEBGL
+
         [UnityTest]
         public IEnumerator SwitchTo() => UniTask.ToCoroutine(async () =>
         {
@@ -215,6 +221,8 @@ namespace Cysharp.Threading.TasksTests
             currentThreadId.Should().Be(switchedThreadId2);
         });
 
+#endif
+
         //[UnityTest]
         //public IEnumerator ObservableConversion() => UniTask.ToCoroutine(async () =>
         //{
diff --git a/src/UniTask/Assets/Tests/CoroutineToUniTaskTest.cs b/src/UniTask/Assets/Tests/CoroutineToUniTaskTest.cs
index a27f30b..0ac19bb 100644
--- a/src/UniTask/Assets/Tests/CoroutineToUniTaskTest.cs
+++ b/src/UniTask/Assets/Tests/CoroutineToUniTaskTest.cs
@@ -135,6 +135,8 @@ namespace Cysharp.Threading.TasksTests
             l.Add(30);
         }
 
+#if !UNITY_WEBGL
+
         [UnityTest]
         public IEnumerator WaitForSecondsTest() => UniTask.ToCoroutine(async () =>
         {
@@ -162,6 +164,8 @@ namespace Cysharp.Threading.TasksTests
             yield return new WaitForSeconds(3.0f);
         }
 
+#endif
+
         IEnumerator Worker(List<(int, int)> l)
         {
             l.Add((0, Time.frameCount));
diff --git a/src/UniTask/Assets/Tests/DelayTest.cs b/src/UniTask/Assets/Tests/DelayTest.cs
index 3040341..22cde4a 100644
--- a/src/UniTask/Assets/Tests/DelayTest.cs
+++ b/src/UniTask/Assets/Tests/DelayTest.cs
@@ -175,6 +175,7 @@ namespace Cysharp.Threading.TasksTests
             }
         });
 
+#if !UNITY_WEBGL
 
         [UnityTest]
         public IEnumerator DelayInThreadPool() => UniTask.ToCoroutine(async () =>
@@ -185,6 +186,8 @@ namespace Cysharp.Threading.TasksTests
             });
         });
 
+#endif
+
         [UnityTest]
         public IEnumerator DelayRealtime() => UniTask.ToCoroutine(async () =>
         {
diff --git a/src/UniTask/Assets/Tests/RunTest.cs b/src/UniTask/Assets/Tests/RunTest.cs
index b9f6f7f..3ee0b0d 100644
--- a/src/UniTask/Assets/Tests/RunTest.cs
+++ b/src/UniTask/Assets/Tests/RunTest.cs
@@ -37,6 +37,7 @@ namespace Cysharp.Threading.TasksTests
     {
 #if CSHARP_7_OR_LATER || (UNITY_2018_3_OR_NEWER && (NET_STANDARD_2_0 || NET_4_6))
 #if !UNITY_WSA
+#if !UNITY_WEBGL
 
         //[UnityTest]
         //public IEnumerator RunThread() => UniTask.ToCoroutine(async () =>
@@ -88,7 +89,7 @@ namespace Cysharp.Threading.TasksTests
             }
         });
 
-
+#endif
 #endif
 #endif
     }