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In 1996, the iframe tag was introduced by Internet Explorer like the object element, it can load or fetch content asynchronously. This placed additional load on the server and made bandwidth a limiting factor on performance. Each time the browser reloaded a page because of a partial change, all of the content had to be re-sent, even though only some of the information had changed. This process was inefficient, as reflected by the user experience: all page content disappeared, then the new page appeared. Each user action required that a complete new page be loaded from the server. In the early-to-mid 1990s, most Web sites were based on complete HTML pages. Instead, it is existing technologies used in a new way. Ajax is not a new technology, nor is it a new language. The built-in XMLHttpRequest object is used to execute Ajax on webpages, allowing websites to load content onto the screen without refreshing the page. The webpage can be modified by JavaScript to dynamically display-and allow the user to interact with the new information. HTML and CSS can be used in combination to mark up and style information. In practice, modern implementations commonly utilize JSON instead of XML.ДЄjax is not a technology, but rather a programming concept. By decoupling the data interchange layer from the presentation layer, Ajax allows web pages and, by extension, web applications, to change content dynamically without the need to reload the entire page. With Ajax, web applications can send and retrieve data from a server asynchronously (in the background) without interfering with the display and behaviour of the existing page.

For other uses, see Ajax (disambiguation).ДЄsynchronous JavaScript and XML FirstВ appearedДЄjax (also AJAX / Л€ eЙЄ dК’ Г¦ k s/ short for ' Asynchronous JavaScript and XML') is a set of web development techniques that uses various web technologies on the client-side to create asynchronous web applications.

Rack app error handling request { get css js