You may have been exposed to web sites that uses fancy animations and interface created in Flash or Java. You could be using Web 2.0 applications such as Facebook, Farmtown, Twitter and others. Most of these web programs were written using various web development languages: Java, AJAX, some kind of CMS, Ruby-on-Rails and others enabling content to be easily managed by website owners and their visitors. No matter what they are, our browser still views them as HTML. True, these pages are not static but behind the scenes, the browser still sees of it most as HTML.

You may hear some Search Engine Optimizaiton (SEO) experts not liking websites made purely in Flash. The reason behind it is that the google bots that are responsible for indexing websites according to its relevance (ofcourse using the ever mysterious Google Website Ranking Algorithm) only see the HTML tags of a webpage and the content inside the FLASH OBJECT is not transparent. Hence, the content within the site is not helping in improving the site's page rank.