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This will write "Hello world!" on every page, below the title, until you remove the code. User scripts are written in JavaScript, and both of the above code snippets are in JavaScript. The second snippet uses JQuery, a JavaScript library that specializes in manipulating HTML. $ is a JQuery function that lets us target the HTML element we want.
When a web page is loaded, the browser creates a Document Object Model of the page, which is an object oriented representation of an HTML document that acts as an interface between JavaScript and the document itself. This allows the creation of dynamic web pages, [13] because within a page JavaScript can:
Include rollover buttons or drop-down menus. A less common use is to create browser-based action games. Although a number of games were created using DHTML during the late 1990s and early 2000s, [4] differences between browsers made this difficult: many techniques had to be implemented in code to enable the games to work on multiple platforms.
JSON was based on a subset of the JavaScript scripting language (specifically, Standard ECMA-262 3rd Edition—December 1999 [11]) and is commonly used with JavaScript, but it is a language-independent data format. Code for parsing and generating JSON data is readily available in many programming languages.
W3Schools is a freemium educational website for learning coding online. [1] [2] Initially released in 1998, it derives its name from the World Wide Web but is not affiliated with the W3 Consortium. [3] [4] [unreliable source] W3Schools offers courses covering many aspects of web development. [5] W3Schools also publishes free HTML templates.
Initially code-named "Cougar", [18] HTML 4.0 adopted many browser-specific element types and attributes, but also sought to phase out Netscape's visual markup features by marking them as deprecated in favor of style sheets. HTML 4 is an SGML application conforming to ISO 8879 – SGML.
JSONP, or JSON-P (JSON with Padding), is a historical JavaScript technique for requesting data by loading a <script> element, [1] which is an element intended to load ordinary JavaScript. It was proposed by Bob Ippolito in 2005. [ 2 ]
Node.js (JavaScript): While JavaScript is traditionally a client-side language, Node.js enables developers to run JavaScript on the server side. It is known for its event-driven, non-blocking I/O model , making it suitable for building scalable and high-performance applications.