9.19

Many web sites today provide rich user interfaces using Ajax. List two features each of which reveals if a site uses Ajax, without having to look at the source code. Using the above features, find three sites which use Ajax; you can view the HTML source of the page to check if the site is actually using Ajax.

---

If a website can load data without refreshing the page, it is using Ajax.

Two features that reveal if a site uses Ajax: 1. Infinite scroll (like the one on twitter) 2. Maps loading new data when you zoom (like the one on Google maps)

Three sites that use Ajax: 1. Google Maps 2. Twitter 3. Pretty much every website that uses Ads. Since the ads need to be refreshed, without refreshing the web page they need to use Ajax.