Check the doctype validity using W3c validator (hml , xhtml, ...) when you create or update your page / post / custom post type and show the result in
How to install the plugin and get it working.
(x)html-easy-validatorfolder to the
you are done
now go the list of your post / page / custom post type in the WP back-end
Requires: 3.2.1 (certainly less too but not check) or higher
Compatible up to: 3.2.1
Last Updated: 2011-8-30
Active Installs: 100+
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