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Through Java, Java Script, DHTML, Flash, Silverlight and other technologies, application-specific methods such as drawing on the screen, playing audio, and access to the keyboard and mouse are all possible.Many services have worked to combine all of these into a more familiar interface that adopts the appearance of an operating system.
An upgrade to the server-side code of the application would typically also require an upgrade to the client-side code installed on each user workstation, adding to the support cost and decreasing productivity.
It allowed the use of a scripting language to program interactions on the client side with no need to communicate with the server. At that time both Java Script and XML had already been developed, but Ajax had still not yet been coined and the XMLHttp Request object had only been recently introduced on Internet Explorer 5 as an Active X object.
In 1999, the "web application" concept was introduced in the Java language in the Servlet Specification version 2.2. In 2005, the term Ajax was coined, and applications like Gmail started to make their client sides more and more interactive.
HTML5 also enriched the semantic content of documents.
The APIs and document object model (DOM) are no longer afterthoughts, but are fundamental parts of the HTML5 specification.