It is really complex to indicate the main features of modern web site, because web design is closer to art and can’t be described with clear definitions. However there are few criteria that up-to-date site should correspond to.
First: minimalism, simplicity and intuitive interface. Users visit your site to find specific information, and even if your site is made in the avant-garde style with all sorts of technical solutions and fashion victim, a visitor can hardly appreciate it if for finding the necessary information he needs to waste much time in dense forest of navigation.
Second: correct displaying of your site in most used browsers. New browsers support modern features of HTML5 and CSS3. However there are still Internet surfers who use old-school software, who unfortunately will inevitably turn out to be “overboard”
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