Sumada Kaabaha: w3c validation
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W3C validation auto check
Automatically checks the validity of the page with the service provided by the site http://validator.w3.org/
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(x)html easy validator
Check the doctype validity using W3c validator (html , xhtml , … ) when creating or updating page / post / custom post type and show the result in …