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If the messages are not showing up in your HTML file, there could be several reasons for this issue. Here are some troubleshooting steps to help you resolve the problem:

1. **Check the Socket.IO Connection**: Ensure that the client successfully connects to the Socket.IO server. You can add a console log statement in your JavaScript to check this:

   ```javascript
   socket.on('connect', function() {
       console.log('Connected to the Socket.IO server');
   });
   ```

   Open your browser's developer console to see if the "Connected to the Socket.IO server" message appears. If it doesn't, there might be an issue with the Socket.IO connection.

2. **Verify the Event Name**: Make sure that the event names used in both the client-side and server-side code match. In your client-side JavaScript code, you should have:

   ```javascript
   socket.on('message', function(data) {
       appendMessage(data.username, data.message);
   });
   ```

   And in your server-side code:

   ```python
   @socketio.on('message')
   def handle_message(data):
       # ...
   ```

   Ensure that the event name `'message'` is consistent.

3. **Check the `appendMessage` Function**: Verify that the `appendMessage` JavaScript function is correctly defined and that it appends messages to the `chat-messages` div. You can add a `console.log` statement inside the `appendMessage` function to check if it's being called:

   ```javascript
   function appendMessage(username, message) {
       console.log('Appending message:', username, message);
       // Rest of the code to append the message
   }
   ```

   Check if the "Appending message" log appears in the console when a message is received.

4. **Check Server Logs**: Examine the server logs to see if there are any errors or issues occurring when handling the Socket.IO events. Ensure that the server is running without errors.

5. **Inspect the HTML**: Open your HTML file in the browser and right-click to inspect the page. Navigate to the "Console" tab of the developer tools and check if there are any error messages or warnings related to your JavaScript code.

6. **Ensure the `emit` Function is Called**: Verify that the `emit` function in your server-side code is being called when a message is received and that it's broadcasting the message to the correct room.

7. **Check Room Assignment**: Ensure that the `room` parameter when emitting the message is set correctly. In your code, it should be set to the `chat_id`.

   ```python
   room = chat_id
   emit('message', {'username': username, 'message': message}, room=room)
   ```

8. **Test Sending Messages**: Test sending messages from the client side to the server to confirm that messages are being sent and received correctly. You can add a client-side event handler for sending messages and use the `socket.emit` function to send messages to the server.

If you've gone through these steps and are still facing issues, please provide additional details about any error messages or unexpected behavior you're encountering, and I'll do my best to assist further.