Beyond Basic HTML
HTML (Hypertext Markup Language), invented by Tim Berners-Lee, has come a long way since its inception in 1990. Figure 1-1 shows an abbreviated timeline of HTML from the HTML5Rocks slides (http://slides.html5rocks.com/#slide3).
Figure 1-1 HTML timeline
At the epicenter of AJAX is the XMLHttpRequest object invented by Microsoft in the late 1990s. XMLHttpRequest allows a website to connect to a remote server and receive structured data. As opposed to creating a set of static pages, a developer was empowered to create highly dynamic applications. Gmail, Twitter, and Facebook are examples of these types of applications.