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JavaScript (/ ˈdʒɑːvəskrɪpt /), often abbreviated as JS, is a programming language and core technology of the Web, alongside HTML and CSS. 99% of websites use JavaScript on the client side for webpage behavior. [10] Web browsers have a dedicated JavaScript engine that executes the client code.
The first JavaScript engine was created by Brendan Eich in 1995 for the Netscape Navigator web browser. [5] It was a rudimentary interpreter for the nascent language Eich invented. [6] (. This evolved into the SpiderMonkey engine, still used by the Firefox browser. [5]) Google debuted its Chrome browser in 2008, with the V8 JavaScript engine ...
A bookmarklet is a bookmark stored in a web browser that contains JavaScript commands that add new features to the browser. They are stored as the URL of a bookmark in a web browser or as a hyperlink on a web page. Bookmarklets are usually small snippets of JavaScript executed when user clicks on them.
Rhino (JavaScript engine) 1997: Mozilla Foundation, 1998: Mozilla Corporation, now developed by volunteers. Rhino is a JavaScript engine written fully in Java and managed by the Mozilla Foundation as open source software. It is separate from the SpiderMonkey engine, which is also developed by Mozilla, but written in C++ and used in Mozilla Firefox.
Influenced by. JavaScript and XML. Ajax (also AJAX / ˈeɪdʒæks /; short for " asynchronous JavaScript and XML " [ 1 ][ 2 ]) is a set of web development techniques that uses various web technologies on the client-side to create asynchronous web applications. With Ajax, web applications can send and retrieve data from a server asynchronously ...
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 which shows all JavaScript and CSS errors. Chrome and Edge - use Tools → Developer Tools.
JavaScript. Python. MDN Web Docs, previously Mozilla Developer Network and formerly Mozilla Developer Center, is a documentation repository and learning resource for web developers. It was started by Mozilla in 2005 [1] as a unified place for documentation about open web standards, Mozilla's own projects, and developer guides.
Greasemonkey is a userscript manager made available as a Mozilla Firefox extension. It enables users to install scripts that make on-the-fly changes to web page content after or before the page is loaded in the browser (also known as augmented browsing). The changes made to the web pages are executed every time the page is viewed, making them ...