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These are typically built into browsers, in their DevTools window. Debuggers allow you to step debug (go through your JavaScript code line-by-line, hover over variables to see their values, etc.) Firefox - use Tools → JavaScript Console showing all JavaScript and CSS errors. Chrome and Edge - use Tools → Developer Tools.
In order to install a user script for your Wikipedia account, add the following line to Special:MyPage/common.js or Special:MyPage/skin.js: {{subst:lusc|script_path}} ...
Check the checkbox at Preferences → Gadgets → Advanced → Install scripts without having to manually edit JavaScript files (documentation) and click Save. Come back to this page. Click "Install" after each script name to install the script. Some scripts may require additional steps, so be sure to visit the documentation if any.
A Wikipedia gadget is a JavaScript program and/or a CSS snippet that can be enabled simply by checking an option in your preferences. The gadget's function is provided by the MediaWiki extension Gadgets .
The webpage can be modified by JavaScript to dynamically display (and allow the user to interact with) the new information. The built-in XMLHttpRequest object is used to execute Ajax on webpages, allowing websites to load content onto the screen without refreshing the page. Ajax is not a new technology, nor is it a new language.
JavaScript can interact with the page via Document Object Model (DOM), to query page state and modify it. Even though a web page can be dynamic on the client-side, it can still be hosted on a static hosting service such as GitHub Pages or Amazon S3 as long as there is not any server-side code included.
Dynamic HTML, or DHTML, is a term which was used by some browser vendors to describe the combination of HTML, style sheets and client-side scripts (JavaScript, VBScript, or any other supported scripts) that enabled the creation of interactive and animated documents.
In July 2005, George Jempty suggested an optional variable assignment be prepended to JSON. [19] [20] The original proposal for JSONP, where the padding is a callback function, appears to have been made by Bob Ippolito in December 2005 [21] and is now used by many Web 2.0 applications such as Dojo Toolkit and Google Web Toolkit.