I also don't know how widespread this technique was back then, but I'm shocked this was left out of the article. This phenomenon was literally the method that

I also don't know how widespread this technique was back then, but I'm shocked this was left out of the article. This phenomenon was literally the method that transformed a "websites" into "webapps" in the early days. We would use pools of invisible iframes to constantly update different parts of the page for a "reactive" experience. The author mentions various important hacks that define the early days, but missing this one seems like a blunder to me.