JavaScript and Jquery for Website Developing

Today's web is still evolving. One of the more popular movements is known as unobtrusive scripting. The unobtrusive scripting paradigm contains two components, progressive enhancement and behavioral separation. Behavioral separation calls for structure to be separated from style, and for both of these elements to be separated from behavior. In this model, HTML or XHTML provides the structure, whereas the CSS provides the style and JavaScript provides the behavior. Progressive enhancement means adding more features to the page as the browser's capabilities are tested; enhancing the user experience when possible but not expecting that JavaScript or a certain JavaScript function will always be available. In this way, the JavaScript is unobtrusive; it doesn't get in the way of the user experience. If JavaScript isn't available in the browser, the website still works because the visitor can use the website in some other way.