This plugin will allow you to check your pages/posts HTML against the W3C Validator.
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.
Automatically checks the validity of the page with the service provided by the site http://validator.w3.org/
Geolocation Services attempts to retrieve a visitor's physical location, allowing for geographically relevant content to be delivered.
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
[Pushup](http://www.pushuptheweb.com) is an effort to push the web forward by helping users upgrade their outdated browsers. This WordPress plugin is
This plugin replaces the default "read more" with custom text, AND adds a chosen number of the post-title-words to it, so all your links are unique.
WP-Validate collects all the pages on your site and runs them through the W3C's HTML Validator.
This plugin performs a batch markup validation check over your entire WordPress website.