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
This screenshot show how validation is display in the backend of wordpress and how is simple to see where validation problem are. As you can see, result are sortable Each result is a link to the w3c validator of your page /post .... you'll can use it to go the the full page of w3c validator and correct your code
Settings give the capability to:
Requires: 3.2.1 (certainly less too but not check) or higher
Compatible up to: 3.2.1
Last Updated: 5 years ago
Active Installs: 100+
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