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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. Markup validation is an important step towards ensuring the technical quality of web pages.
An expansion of the 400 Bad Request response code, used when a client certificate is required but not provided. 497 HTTP Request Sent to HTTPS Port. An expansion of the 400 Bad Request response code, used when the client has made a HTTP request to a port listening for HTTPS requests. 499 Client Closed Request.
The Acid3 test is a web test page from the Web Standards Project that checks a web browser 's compliance with elements of various web standards, particularly the Document Object Model (DOM) and JavaScript . If the test is successful, the results of the Acid3 test will display a gradually increasing fraction counter below a series of colored ...
W3Schools offers courses covering many aspects of web development. W3Schools also publishes free HTML templates. It is run by Refsnes Data in Norway. It has an online text editor called TryIt Editor, and readers can edit examples and run the code in a test environment.
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.
Compliance tests for website code. W3C offers online services to test websites directly for both web site developers, as well as for website users. These include: Markup Validation Service to check the markup (HTML, XHTML, ...) of Web documents; CSS Validation Service to check Cascading Style Sheets (CSS) and (X)HTML documents with style sheets
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Web testing tools may be classified based on different prerequisites that a user may require to test web applications mainly scripting requirements, GUI ...