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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 ...
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.
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.
SpiderMonkey. SpiderMonkey is an open-source JavaScript and WebAssembly engine by the Mozilla Foundation. [4] It is the first JavaScript engine, written by Brendan Eich at Netscape Communications, and later released as open source and currently maintained by the Mozilla Foundation. It is used in the Firefox web browser.
Tutorials. A re-introduction to JavaScript (JS tutorial) – when you are ready for a second go. Basic JavaScript – freeCodeCamp's 10-hour JavaScript learning track; The Modern JavaScript Tutorial – from beginning to advanced. Introduction to Object-Oriented JavaScript – from the Mozilla Developer Network; JavaScript Tutorial – from ...
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.
Type. PDF viewer. License. Apache License 2.0 [3] Website. mozilla.github.io /pdf.js /. PDF.js is a JavaScript library that renders Portable Document Format (PDF) files using the web standards -compliant HTML5 Canvas. The project is led by the Mozilla Corporation after Andreas Gal launched it (initially as an experiment) in 2011.