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In its most common form, the three tiers are called presentation, application and storage, in this order.A web browser is the first tier (presentation), an engine using some dynamic Web content technology (such as ASP, CGI, Cold Fusion, Dart, JSP/Java, Node.js, PHP, Python or Ruby on Rails) is the middle tier (application logic), and a database is the third tier (storage).
In the early days of the Web, each individual web page was delivered to the client as a static document, but the sequence of pages could still provide an interactive experience, as user input was returned through web form elements embedded in the page markup.
However, every significant change to the web page required a round trip back to the server to refresh the entire page.
In 1995, Netscape introduced a client-side scripting language called Java Script allowing programmers to add some dynamic elements to the user interface that ran on the client side.
A web page script is able to contact the server for storing/retrieving data without downloading an entire web page.
In 2011, HTML5 was finalized, which provides graphic and multimedia capabilities without the need of client side plug-ins.