W3C HTML Validator Check the markup validity of HTML files using the W3C validator w3c-html-validator takes HTML files and returns detailed validation results. The reporter produces formatted output ...

CSE HTML Validator Pro ($69 direct) is an impressive Windows tool for HTML validation, link checking, and more. Validator Pro combines a text editor and integrated Web browser with sophisticated and ...

The SuperHTML CLI Tool offers validation and autoformatting features for HTML files. The tool can be used either directly (for example by running it on save), or through a LSP client implementation. $ ...

Software that checks the validity of tags in an HTML document. Browsers treat errors differently, such as a start tag without an end tag, a lack of quotes or extra quotes. Unless an HTML page is ...

Apple's decision to promote KDE's KHTML rendering engine and, by extension, the KHTML-based Konqueror to Major Browser status makes web standards important again. Webmasters who test in only Microsoft ...

In December, Google told us they would move its structured data testing tool from Google's site to the Schema.org domain. This was after it first said it will deprecate the tool, since Google only ...