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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.
Link Sleuth runs on Microsoft Windows. Link verification is performed on links which appear in <a> tags, as well as images, frames, plug-ins, backgrounds, local image maps, style sheets, scripts, and Java applets. The program follows links to other pages, and checks the links on those pages also, so it is possible to check an entire site for ...
Checklinks is a tool that checks external links for Wikimedia Foundation wikis.It parses a page, queries all external links and classifies them using heuristics.The tool runs in two modes: an on-the-fly for instant results on individual pages and project scan for producing reports for interested WikiProjects.
CSS HTML Validator (previously named CSE HTML Validator) is an HTML editor and CSS editor for Microsoft Windows (and Linux and other Unix-like operating systems 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.
W3Schools is a freemium educational website for learning coding online. [1] [2] Initially released in 1998, it derives its name from the World Wide Web but is not affiliated with the W3 Consortium. [3] [4] [unreliable source] W3Schools offers courses covering many aspects of web development. [5] W3Schools also publishes free HTML templates.
SortSite is a web crawler that scans entire websites for quality issues including accessibility, browser compatibility, broken links, legal compliance, search optimization, usability and web standards compliance.
The original Bobby was a free online tool, written by Josh Krieger and provided by the Centre for Applied Special Technology (CAST), used to validate websites for WAI and Section 508 compliance. Launched in 1995, [ 1 ] it became well known for the usage of the Bobby Approved icon that website authors could use to indicate they have successfully ...
A canonical link element is an HTML element that helps webmasters prevent duplicate content issues in search engine optimization by specifying the "canonical" or "preferred" version of a web page. It is described in RFC 6596, which went live in April 2012.