Embedded Files
The W3C develops and hosts free and open source tools used every day by millions of Web developers and Web designers. All the tools listed below are Web-based, and are available as downloadable sources or as free services on the W3C Developers tools site.
W3C validator
W3C validator
The W3C validator checks the markup validity of various Web document formats, such as HTML. Note that you are automatically directed to the Nu Html Checker when validating an HTML5 document.
CSS validator
CSS validator
The CSS validator checks Cascading Style Sheets (CSS) and (X)HTML documents that use CSS stylesheets.
Internationalization checker
Internationalization checker
The W3C Internationalization Checker provides information about various internationalization-related aspects of your page, including the HTTP headers that affect it. It will also report a number of issues and offer advice about how to resolve them.
Link checker
Link checker
The W3C Link Checker looks for issues in links, anchors and referenced objects in a Web page, CSS style sheet, or recursively on a whole Web site. For best results, it is recommended to first ensure that the documents checked use valid (X)HTML Markup and CSS.
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