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JSFiddle is a web service and community for testing and sharing code snippets of HTML, CSS and JavaScript. It has a minimalist interface, supports external resources and frameworks, and was launched in 2010 by Oskar Krawczyk and Piotr Zalewa.
CodePen is a platform for testing and showcasing HTML, CSS and JavaScript code snippets, founded in 2012 by three developers. It has over 330,000 users and 14 million monthly visitors, and functions as an open-source learning environment.
Playground Access PHP Ruby/Rails Python/Django SQL Other dbfiddle [am]: Free No No No Yes Db2, Firebird, MariaDB, MySQL, Node.js, Oracle, Postgres, SQL Server, SQLite, YugabyteDB
HTML is the standard markup language for web pages, defined by the W3C and ISO. Learn about its origins, elements, tags, attributes, versions and related technologies such as CSS, JavaScript and HTML5.
CSS is a language that specifies the presentation and styling of HTML or XML documents. Learn about its syntax, selectors, rules, concepts, tools, and history from the official Wikipedia article.
JavaScript is a programming language and core technology of the Web, alongside HTML and CSS. Learn about its creation at Netscape, adoption by Microsoft, standardization by ECMA, and usage in browsers, servers, and apps.
PostCSS is a framework to automate routine CSS operations using JavaScript-based plugins. It can work with different syntaxes such as Sass, Less, and SugarSS, and provide features such as prefixing, modularization, linting, and minification.
Learn about the tools and techniques used to create the graphical user interface of a website, such as HTML, CSS, JavaScript, and WebAssembly. Find out the goals and challenges of front-end development, such as accessibility, performance, and speedy development.