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CodePen is an online community for testing and showcasing user-created HTML, CSS and JavaScript code snippets. It functions as an online code editor and open-source learning environment, where developers can create code snippets, called "pens," and test them. It was founded in 2012 by full-stack developers Alex Vazquez and Tim Sabat and front ...
W3C Markup Validation Service. The Markup Validation Service is a validator by the World Wide Web Consortium (W3C) that allows Internet users to check pre-HTML5 HTML and XHTML documents for well-formed markup against a document type definition (DTD). Markup validation is an important step towards ensuring the technical quality of web pages.
e. Cascading Style Sheets (CSS) is a style sheet language used for specifying the presentation and styling of a document written in a markup language such as HTML or XML (including XML dialects such as SVG, MathML or XHTML). [ 1 ] CSS is a cornerstone technology of the World Wide Web, alongside HTML and JavaScript.
JSFiddle. JSFiddle is an online IDE service and online community for testing and showcasing user-created and collaborational HTML, CSS and JavaScript code snippets, known as 'fiddles'. It allows for simulated AJAX calls. In 2019, JSFiddle was ranked the second most popular online IDE by the PopularitY of Programming Language (PYPL) index based ...
Supports all JavaScript and CSS libraries. sequential [w] Free No No Yes No Yes JQ.VER.SION [x] Free Yes Yes Yes No No jQuery: Khan Academy [y] Free No No Yes No No Mozilla Thimble [z] Free Yes Yes Yes No No Add & manage files; light & dark themes; create/follow embedded tutorials; responsive design testing mode Webpaw [aa] Free Yes Yes Yes Yes Yes
CACHE MANIFEST /test.css /test.js /test.png This manifest file lists three resources: a CSS file, a JavaScript file and a PNG image. When the above file is loaded, the browser will download the test.css, test.js and test.png files from the root directory in the web server. [7]
Online. Acid2 is a webpage that test web browsers ' functionality in displaying aspects of HTML markup, CSS 2.1 styling, PNG images, and data URIs. The test page was released on 13 April 2005 by the Web Standards Project. The Acid2 test page will be displayed correctly in any application that follows the World Wide Web Consortium and Internet ...
CSS HTML Validator (previously named CSE HTML Validator) is an HTML editor and CSS editor for Windows (and Linux when used with Wine) that helps web developers create syntactically correct and accessible HTML / HTML5, XHTML, and CSS documents by locating errors, potential problems like browser compatibility issues, and common mistakes.