Evolution of the Web
Over time web technologies have evolved to give web developers the ability to create new generations of useful and immersive web experiences. Today's web is a result of the ongoing efforts of an open web community that helps define these web technologies, like HTML5, CSS3 and WebGL and ensure that they're supported in all web browsers.
The black timelines show major browser releases. As you click each browser icon, you can see how the browser window has changed for each release, which I think is the most interesting part of the interactive.