The full name of HTML is Hyper-text Markup Language which is the fundation of all web pages. With this language, users can compose the text, graphics, movie and sound to create a webpage. Thus, this is the language which web designers must know. Since HTML is mainly for web page layout and it lacks of interactive features, it explains why most websites will use JavaScript in conjunction with HTML to provide interactive effects. For example, it can be used to trace the version of browser, plug-in the information, scrolling status bars, roll-over the banners, and verify information such as email address. The powerful integration between HTML and JavaScrip enhances greatly the performance and efficiency of web development.