diff --git a/.github/workflows/build-webgl.yml b/.github/workflows/build-webgl.yml
index 4adaae47a..cfaaac27e 100644
--- a/.github/workflows/build-webgl.yml
+++ b/.github/workflows/build-webgl.yml
@@ -2,6 +2,9 @@ name: WebGL to gh-page
 
 on:
   workflow_dispatch:
+  # push:
+  #   branches:
+  #     - workflow-webgl-wip
 
 env:
   UNITY_PROJECT_PATH: .
@@ -53,17 +56,47 @@ jobs:
         echo "${UNITY_EDITOR_EXECUTABLE} is installed."
         echo "unity-editor-executable=${UNITY_EDITOR_EXECUTABLE}" >> "${GITHUB_OUTPUT}"
 
-    - name: Buidl WebGL
-      id: build-webgl
+    # URP
+    - name: Build VRM10Viewer
+      id: build-webgl-VRM10Viewer
       run: |
-        # build to Build/SimpleViewer
+        # build to Build/VRM10Viewer
         "${{ steps.detect-unity-version.outputs.unity-editor-executable }}" \
-          -batchmode \
+          -batchmode -quit \
           -silent-crashes \
           -projectPath "${{ env.UNITY_PROJECT_PATH }}" \
-          -executeMethod "VRM.BuildClass.BuildWebGL_SimpleViewer" \
-          -logFile create-webgl.log
-        echo "Success to create BuildWebGL."
+          -executeMethod "UniVRM10.DevOnly.BuildClass.BuildWebGL_VRM10Viewer" \
+          -logFile webgl-VRM10Viewer.log
+        echo "Success to WebGL VRM10Viewer."
+
+    # はじめに built-in RenderPipeline にして一度終わる。然るのちに
+    - name: Build SimpleViewer
+      id: build-webgl-SimpleViewer
+      run: |
+        "${{ steps.detect-unity-version.outputs.unity-editor-executable }}" \
+          -batchmode -quit \
+          -silent-crashes \
+          -projectPath "${{ env.UNITY_PROJECT_PATH }}" \
+          -executeMethod "VRM.DevOnly.BuildClass.SwitchBuiltinPipeline"
+        echo "Success to Switch built-in RenderPipeline."
+
+        # build to Build/SimpleViewer
+        "${{ steps.detect-unity-version.outputs.unity-editor-executable }}" \
+          -batchmode -quit \
+          -silent-crashes \
+          -projectPath "${{ env.UNITY_PROJECT_PATH }}" \
+          -executeMethod "VRM.DevOnly.BuildClass.BuildWebGL_SimpleViewer" \
+          -logFile webgl-SimpleViewer.log
+        echo "Success to WebGL SimpleViewer."
+
+        # make index
+        cat << __HTML__ > Build/index.html
+        <h2>$GITHUB_SHA</h2>
+        <ul>
+          <li>URP<a href="./VRM10Viewer/">VRM10Viewer</a></li>
+          <li>Built-in<a href="./SimpleViewer/">SimpleViewer</a></li>
+        </ul>
+        __HTML__
 
     - name: Upload artifact
       uses: actions/upload-pages-artifact@v2
diff --git a/Assets/VRM/Editor/BuildClass.cs b/Assets/VRM/Editor/BuildClass.cs
index 410de15a4..cff6d56ff 100644
--- a/Assets/VRM/Editor/BuildClass.cs
+++ b/Assets/VRM/Editor/BuildClass.cs
@@ -1,7 +1,6 @@
 using UnityEditor;
-using UnityEngine.Rendering;
 
-namespace VRM
+namespace VRM.DevOnly
 {
     public static class BuildClass
     {
@@ -27,6 +26,11 @@ namespace VRM
             }
         }
 
+        public static void SwitchBuiltinPipeline()
+        {
+            UnityEngine.Rendering.GraphicsSettings.renderPipelineAsset = null;
+        }
+
         public static void BuildWebGL_SimpleViewer()
         {
             var scenes = new string[]{
@@ -46,25 +50,5 @@ namespace VRM
                 throw new System.Exception(report.summary.ToString());
             }
         }
-
-        public static void BuildWebGL_VRM10Viewer()
-        {
-            var scenes = new string[]{
-                "./Assets/VRM10_Samples/VRM10Viewer/VRM10Viewer.unity",
-            };
-
-            var report = BuildPipeline.BuildPlayer(new BuildPlayerOptions
-            {
-                scenes = scenes,
-                locationPathName = "Build/VRM10Viewer",
-                target = BuildTarget.WebGL,
-            }
-            );
-
-            if (report.summary.result != UnityEditor.Build.Reporting.BuildResult.Succeeded)
-            {
-                throw new System.Exception(report.summary.ToString());
-            }
-        }
     }
 }
diff --git a/Assets/VRM/Editor/VrmTopMenu.cs b/Assets/VRM/Editor/VrmTopMenu.cs
index 7c8caa901..d9aab4784 100644
--- a/Assets/VRM/Editor/VrmTopMenu.cs
+++ b/Assets/VRM/Editor/VrmTopMenu.cs
@@ -53,13 +53,13 @@ namespace VRM
         private static void ShowVersionDialog() => VRMVersionMenu.ShowVersionDialog();
 
         [MenuItem(DevelopmentMenuPrefix + "/Build dummy for CI", false, 93)]
-        private static void BuildDummyForCi() => BuildClass.Build();
+        private static void BuildDummyForCi() => DevOnly.BuildClass.Build();
 
-        [MenuItem(DevelopmentMenuPrefix + "/Build 0x WebGL for CI", false, 94)]
-        private static void BuildWebGLForCi0x() => BuildClass.BuildWebGL_SimpleViewer();
+        [MenuItem(DevelopmentMenuPrefix + "/Switch to built-in RenderPipeline", false, 94)]
+        private static void SwitchToBuiltinPipeline() => DevOnly.BuildClass.SwitchBuiltinPipeline();
 
-        [MenuItem(DevelopmentMenuPrefix + "/Build 10 WebGL for CI", false, 95)]
-        private static void BuildWebGLForCi10() => BuildClass.BuildWebGL_VRM10Viewer();
+        [MenuItem(DevelopmentMenuPrefix + "/Build WebGL SimpleViewer for CI", false, 95)]
+        private static void BuildWebGLForCi0x() => DevOnly.BuildClass.BuildWebGL_SimpleViewer();
 
         [MenuItem(DevelopmentMenuPrefix + "/Create UnityPackage", false, 99)]
         private static void CreateUnityPackage() => VRMExportUnityPackage.CreateUnityPackageWithoutBuild();
diff --git a/Assets/VRM10/Editor/BuildClass.cs b/Assets/VRM10/Editor/BuildClass.cs
new file mode 100644
index 000000000..230151a98
--- /dev/null
+++ b/Assets/VRM10/Editor/BuildClass.cs
@@ -0,0 +1,27 @@
+using UnityEditor;
+
+namespace UniVRM10.DevOnly
+{
+    public static class BuildClass
+    {
+        public static void BuildWebGL_VRM10Viewer()
+        {
+            var scenes = new string[]{
+                "./Assets/VRM10_Samples/VRM10Viewer/VRM10Viewer.unity",
+            };
+
+            var report = BuildPipeline.BuildPlayer(new BuildPlayerOptions
+            {
+                scenes = scenes,
+                locationPathName = "Build/VRM10Viewer",
+                target = BuildTarget.WebGL,
+            }
+            );
+
+            if (report.summary.result != UnityEditor.Build.Reporting.BuildResult.Succeeded)
+            {
+                throw new System.Exception(report.summary.ToString());
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/Assets/VRM10/Editor/BuildClass.cs.meta b/Assets/VRM10/Editor/BuildClass.cs.meta
new file mode 100644
index 000000000..df70f0176
--- /dev/null
+++ b/Assets/VRM10/Editor/BuildClass.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 3783cb4bfaca889418092d0fdde301ad
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/VRM10/Editor/Vrm10TopMenu.cs b/Assets/VRM10/Editor/Vrm10TopMenu.cs
index e0cc2d8eb..ace2ff2cf 100644
--- a/Assets/VRM10/Editor/Vrm10TopMenu.cs
+++ b/Assets/VRM10/Editor/Vrm10TopMenu.cs
@@ -26,6 +26,9 @@ namespace UniVRM10
 
         [MenuItem(DevelopmentMenuPrefix + "/Generate from JsonSchema(debug)", false, 101)]
         private static void Parse() => Vrm10SerializerGenerator.Run(true);
+
+        [MenuItem(DevelopmentMenuPrefix + "/Build WebGL VRM10Viewer for CI", false, 201)]
+        private static void BuildWebGLForCi10() => DevOnly.BuildClass.BuildWebGL_VRM10Viewer();
 #endif
     }
 }