Thanks for your reply! Accessibility is a factor in this course and is addressed early on with an option for a text based version. So while the course won’t necessarily be ‘accessible’ the alternative text version will cater to those who require it. I gave the StackOverflow link a go and it worked to a certain extent. The message would pop up if I tried going back or clicking the backspace key, however it would also pop up whenever I wanted to progress through the course with the navigation buttons built into the course. I’ll keep trying though!