W3C Markup Validator
DescriptionThe W3C Markup Validator is a CGI script which lets you enter the URL of a web page which will be then checked against a validating SGML parser for conformance to official W3C recommendations. Pages can also be uploaded. These are the same scripts that are available on the W3C web site, http://validator.w3.org/.
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Install this software package
If the package is available for the distribution you are currently using on your computer then install the software by clicking on…Install w3c-markup-validator