A practical guide to creating modern Web sites that meet the Web 2.0 concept. Describes the languages HTML 5 and CSS 3, which are used to create the content and presentation of Web pages, respectively. The principles of Web programming in JavaScript using the Ext Core library are given. The article describes the creation of interactive Web pages and provides examples of interactive elements that make Web pages more convenient for visitors. Issues related to the implementation of loaded and generated content, semantic markup, and the use of databases for generating Web pages are covered. Shows ways to extend the functionality of Web sites using Web forms, controls, freely positioned elements, and programmatic drawing using HTML 5.