diff --git a/.github/workflows/e2e-test.yml b/.github/workflows/e2e-test.yml
index 8ee988d5..3c469bf4 100644
--- a/.github/workflows/e2e-test.yml
+++ b/.github/workflows/e2e-test.yml
@@ -44,6 +44,14 @@ jobs:
       #     name: playwright-report
       #     path: playwright-report/
       #     retention-days: 30
+      - name: Slack Notification
+        if: success()
+        uses: rtCamp/action-slack-notify@v2
+        env:
+          SLACK_CHANNEL: sora-js-sdk
+          SLACK_COLOR: good
+          SLACK_TITLE: Success test
+          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
       - name: Slack Notification
         if: failure()
         uses: rtCamp/action-slack-notify@v2
diff --git a/examples/messaging/main.mjs b/examples/messaging/main.mjs
index c6c64ab4..4de060aa 100644
--- a/examples/messaging/main.mjs
+++ b/examples/messaging/main.mjs
@@ -43,6 +43,7 @@ document.querySelector('#start').addEventListener('click', async () => {
 })
 document.querySelector('#stop').addEventListener('click', async () => {
   await recvonly.disconnect()
+  document.querySelector('#received-messages').innerHTML = null
 })
 document.querySelector('#send-message').addEventListener('click', async () => {
   const value = document.querySelector('input[name=message]').value
diff --git a/examples/simulcast/main.mjs b/examples/simulcast/main.mjs
index 1ca688ea..e072dd83 100644
--- a/examples/simulcast/main.mjs
+++ b/examples/simulcast/main.mjs
@@ -18,6 +18,7 @@ const sendonly = sora.sendonly(channelId, metadata, {
   simulcast: true,
 })
 sendonly.on('notify', (event) => {
+  console.log(event)
   if (event.event_type === 'connection.created' && event.connection_id === sendonly.connectionId) {
     document.querySelector('#local-video-connection-id').textContent = `${event.connection_id}`
   }
@@ -93,11 +94,17 @@ document.querySelector('#start').addEventListener('click', async () => {
 
 document.querySelector('#stop').addEventListener('click', async () => {
   await sendonly.disconnect()
+  document.querySelector('#local-video').srcObject = null
 
   // recvonly r0
   await recvonlyR0.disconnect()
+  document.querySelector('#remote-video-r0').srcObject = null
+
   // recvonly r1
   await recvonlyR1.disconnect()
+  document.querySelector('#remote-video-r1').srcObject = null
+
   // recvonly r2
   await recvonlyR2.disconnect()
+  document.querySelector('#remote-video-r2').srcObject = null
 })
diff --git a/examples/spotlight_recvonly/main.mjs b/examples/spotlight_recvonly/main.mjs
index 3aaf0585..c0a979aa 100644
--- a/examples/spotlight_recvonly/main.mjs
+++ b/examples/spotlight_recvonly/main.mjs
@@ -43,6 +43,7 @@ recvonly.on('track', (event) => {
 recvonly.on('removetrack', (event) => {
   const remoteVideo = document.querySelector(`#remotevideo-${event.target.id}`)
   if (remoteVideo) {
+    remoteVideo.srcObject = null
     document.querySelector('#remote-videos').removeChild(remoteVideo)
   }
 })
@@ -50,3 +51,8 @@ recvonly.on('removetrack', (event) => {
 document.querySelector('#start-recvonly').addEventListener('click', async () => {
   await recvonly.connect()
 })
+
+document.querySelector('#stop-recvonly').addEventListener('click', async () => {
+  await recvonly.disconnect()
+  document.querySelector('#remote-videos').innerHTML = null
+})
diff --git a/examples/spotlight_sendonly/main.mjs b/examples/spotlight_sendonly/main.mjs
index ca0d6dc0..1477cd10 100644
--- a/examples/spotlight_sendonly/main.mjs
+++ b/examples/spotlight_sendonly/main.mjs
@@ -28,3 +28,8 @@ document.querySelector('#start-sendonly').addEventListener('click', async () =>
   document.querySelector('#sendonly-local-video').srcObject = mediaStream
   await sendonly.connect(mediaStream)
 })
+
+document.querySelector('#stop-sendonly').addEventListener('click', async () => {
+  await sendonly.disconnect()
+  document.querySelector('#sendonly-local-video').srcObject = null
+})
diff --git a/examples/spotlight_sendrecv/main.mjs b/examples/spotlight_sendrecv/main.mjs
index 3c7d129c..6f583aed 100644
--- a/examples/spotlight_sendrecv/main.mjs
+++ b/examples/spotlight_sendrecv/main.mjs
@@ -77,6 +77,7 @@ sendrecv2.on('track', (event) => {
 sendrecv2.on('removetrack', (event) => {
   const remoteVideo = document.querySelector(`#sendrecv2-remotevideo-${event.target.id}`)
   if (remoteVideo) {
+    remoteVideo.srcObject = null
     document.querySelector('#sendrecv2-remote-videos').removeChild(remoteVideo)
   }
 })
@@ -94,15 +95,13 @@ document.querySelector('#start-sendrecv2').addEventListener('click', async () =>
   document.querySelector('#sendrecv2-local-video').srcObject = mediaStream
   await sendrecv2.connect(mediaStream)
 })
-document.querySelector('#stop-sendrecv1').addEventListener('click', () => {
-  sendrecv1.disconnect().then(() => {
-    document.querySelector('#sendrecv1-local-video').srcObject = null
-    document.querySelector('#sendrecv1-remote-videos').innerHTML = null
-  })
+document.querySelector('#stop-sendrecv1').addEventListener('click', async () => {
+  await sendrecv1.disconnect()
+  document.querySelector('#sendrecv1-local-video').srcObject = null
+  document.querySelector('#sendrecv1-remote-videos').innerHTML = null
 })
-document.querySelector('#stop-sendrecv2').addEventListener('click', () => {
-  sendrecv2.disconnect().then(() => {
-    document.querySelector('#sendrecv2-local-video').srcObject = null
-    document.querySelector('#sendrecv2-remote-videos').innerHTML = null
-  })
+document.querySelector('#stop-sendrecv2').addEventListener('click', async () => {
+  sendrecv2.disconnect()
+  document.querySelector('#sendrecv2-local-video').srcObject = null
+  document.querySelector('#sendrecv2-remote-videos').innerHTML = null
 })
diff --git a/tests/e2ee.spec.ts b/tests/e2ee.spec.ts
index e092945d..4e0ad62c 100644
--- a/tests/e2ee.spec.ts
+++ b/tests/e2ee.spec.ts
@@ -35,4 +35,7 @@ test.skip('e2ee sendrecv x2', async ({ browser }) => {
 
   await page1.click('#stop-sendrecv')
   await page2.click('#stop-sendrecv')
+
+  await page1.close()
+  await page2.close()
 })
diff --git a/tests/messaging.spec.ts b/tests/messaging.spec.ts
index 2689fe1f..a4455161 100644
--- a/tests/messaging.spec.ts
+++ b/tests/messaging.spec.ts
@@ -1,6 +1,5 @@
 import { test } from '@playwright/test'
 
-// FIXME: ローカルだと通る
 test.skip('messaging pages', async ({ browser }) => {
   // 新しいページを2つ作成
   const page1 = await browser.newPage()
@@ -47,4 +46,7 @@ test.skip('messaging pages', async ({ browser }) => {
 
   await page1.click('#stop')
   await page2.click('#stop')
+
+  await page1.close()
+  await page2.close()
 })
diff --git a/tests/sendonly_recvonly.spec.ts b/tests/sendonly_recvonly.spec.ts
index a5fa92bb..a9dfc32e 100644
--- a/tests/sendonly_recvonly.spec.ts
+++ b/tests/sendonly_recvonly.spec.ts
@@ -28,4 +28,7 @@ test('sendonly/recvonly pages', async ({ browser }) => {
 
   await page1.click('#stop-sendonly')
   await page2.click('#stop-recvonly')
+
+  await page1.close()
+  await page2.close()
 })
diff --git a/tests/spotlight_sendonly_recvonly.spec.ts b/tests/spotlight_sendonly_recvonly.spec.ts
index 28cabc8c..e480260b 100644
--- a/tests/spotlight_sendonly_recvonly.spec.ts
+++ b/tests/spotlight_sendonly_recvonly.spec.ts
@@ -28,4 +28,7 @@ test('spotlight sendonly/recvonly pages', async ({ browser }) => {
 
   await page1.click('#stop-sendonly')
   await page2.click('#stop-recvonly')
+
+  await page1.close()
+  await page2.close()
 })