CLONE - Students can use a chat window without frames and JavaScript

1. Login as a student and access a chat activity.
2. Follow the 'Use more accessible interface' link.
3. Try submitting a few messages.
4. Check that the messages are displayed correctly below the message submit button.
5. Check the 'Show only new' box then try submitting a few messages.
6. Check that only the most recent message is displayed.