It seems like there are not enough class materials. It was a lecture that read and showed the tutorial provided by w3schools. It might be good for those who are afraid to directly access English materials, but since the English is not that difficult, I think it would be no different from the lecture if you go directly to the website and read it. Even if you can't prepare the class materials yourself, I think it would have been better if you had talked about how it can be utilized or talked about it in depth while watching the tutorial.