A React application with typescript implementation: Making lectures more accessible for students with auditory, visual, or learning impairments; and Improving learning outcomes for students in lecture-based courses.
My guess is that the browser unloaded content from within the tab as it was not being used to free up some memory. If this happens again could you check your console log?
There is some weird behavior when I play and then pause for 40 seconds. When I press play again nothing happens.