A significant fraction of today's Internet traffic is associated with popular web sites such as YouTube, Netflix or Facebook. In recent years, major Internet websites have become more complex as they incorporate a larger number and more diverse types of objects (e.g. video, audio, code) along with more elaborate ways from multiple servers. These not only affect the loading time of pages but also determine the pattern of resulting traffic on the Internet. In this thesis, we characterize the complexity of major Internet websites through large-scale measurement and analysis. We identify thousands of the most popular Internet websites from multiple locations and characterize their complexities. We examine the effect of the relative popularity ranking and business type of the complexity of websites. Finally we compare and contrast our results with a similar study conducted 4 years earlier and report on the observed changes in different aspects.

Hypertext markup language 5 (HTML5), a new standard for HTML, enriched with additional features is expected to override all the basic underlying overhead needed by other applications. By the advent of new extension, HTML5, the web’s basic language is transplanted from a simple page layout into rich web application development language. Furthermore, with the release of HTML5, traditional browsing is expected to change and modify accordingly and on the other hand the potential users will have an alternative rather than sticking in platform and OS dependent native applications. This thesis deals with the readiness assessment of HTML5 with regard to different smart phones- Android and Windows. In order to visualize the fact, we analyzed different constraints like DNS lookup time, page loading time, memory and CPU consumption associated with two applications-Flash and HTML5 running right through the smart phones. Furthermore, the comparative analysis is performed in different network scenarios- Wi-Fi and 3G and user experience is estimated based on network parameters. From the experiments and observations taken, we found that android phones provide better support for HTML5 web applications than windows mobile devices. Also, the HTML5 applications loading time is limited by the browser rendering time rather that the content loading time from the network and is also dependent on hardware configuration of device used.