Validation tools for webmasters (from W3C)

W3C Web Quality Tools

Web Quality Tools – web-based, free, opensource, online or downloadable tools, developed and hosted by W3C.


UNICORN – Improve the quality of the Web

„Improve the quality of the Web“

validator-w3-org-unicorn

https://validator.w3.org/unicorn/

Gathers the results of the HTML and CSS validators, as well as other useful services (Internationalization, RSS/Atom feeds, http headers).

MarkUp Validator

„Check the markup (HTML, XHTML, …) of Web documents“

validator-w3-org

https://validator.w3.org/

Checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc.


CSS validator

„Check Cascading Style Sheets (CSS) and (X)HTML documents with style sheets“

jigsaw-w3-org-css-validator

https://jigsaw.w3.org/css-validator/

Checks Cascading Style Sheets (CSS) and (X)HTML documents that use CSS stylesheets.


 

Link Checker

„Check links and anchors in Web pages or full Web sites“

validator-w3-org-checklink

https://validator.w3.org/checklink

Looks for issues in links, anchors and referenced objects in a Web page, CSS style sheet, or recursively on a whole Web site.


 

mobileOK Checker

„Is your Web site mobile-friendly?“

validator-w3-org-mobile

https://validator.w3.org/mobile/


 

Log Validator

http://www.w3.org/QA/Tools/LogValidator/

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