This plugin performs a batch markup validation check over your entire WordPress website.

A plugin with common features missed in WordPress, like favicon, meta tags, adding HTML to head and footer, WordPress e-mail from header filter, etc.

Geolocation Services attempts to retrieve a visitor's physical location, allowing for geographically relevant content to be delivered.

Remove type attribute from script and style tags added by WordPress

Automatically checks the validity of the page with the service provided by the site http://validator.w3.org/

WP-Validate collects all the pages on your site and runs them through the W3C's HTML Validator.