Currently, on the Internet we can see most of the time clasic website that offer multimedia content to users in the form of texts, pictures and videos or favorite e-shops to enable the purchase of various goods from the comfort of home. More and more we can see website sites, or applications that provide the user with a specific service. This thesis describes a new modern approaches for creating web sites and applications using the latest version of the markup language HTML, which is HTML5. The work is primarily intended for Web developers and encoders, which should provide an overview and basic information in the field of web applications. The acquired knowledge would be to simplify and streamline the work and especially to save time, which can undo web users in the form of new features. The result of their work can be faster, more comfortable user web application (website) that fully exploit potential of web browsers.