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On the server, different languages are used to generate web pages. However, once created and sent to the browser page, javascript is only able to interact with the user to make the page reactive. It is precisely this reactivity and ergonomics that are an expected results by users.

Therefore, javascript has become ubiquitous on the web. Whether checking the validity of information entered on a form, the display image galleries, visual effects on elements of the document, javascript is always present.