Web Standards

W3 schools: "Web developers are often struggling with time-consuming double-coding to solve problems with different browsers versions. This situation will get much worse when new hardware (like mobile telephones and other handheld devices) and new software (like micro-browsers) start browsing the Web.
To make the Web a better place, for both developers and end-users, it is of paramount importance that both browser vendors and site developers follow standards when they develop new applications"