I think , I don't know much about interactive webpages especially in perspective of educational domain, but from the example interactive webpage that I explored I found some adjectives(keywords) that explain interactive webpages, at least that is what I think from my experience such as they are informative, time-saver, practical and have various activities, short quizzes to taste your knowledge through true/false, short answered and multiple choice questions.

I may want to know the practical knowledge to use this type of nifty device in my teaching career since I thought I would have a fun time while creating testing activities for my students via internet and I thought since the program give correct answers whether you answered correctly or not, I thought the students can expand their knowledge and review their already learned knowledge.

Access to correct answer in a question immediately for the students
Practicality of the preparation of activities and quizzes for the teacher
The relatively easiness of online material preparation for the teacher

From the activity I learned that teachers can always, always rely on this material preparation tool in terms of publishing the quizzes with help of internet or even create a hardcopy to disturibute those quizzes in class with export feature of the tool. It defintely saves time for the teacher and is beneficial for the students in terms of information giving