This plugin will allow you to check your pages/posts HTML against the W3C Validator.

Moves the gallery shortcode styles to the head so it doesn't break XHTML validation; allows disabling or modifying the default gallery styles.

HTML Purified replaces the default comments filters with the more secure HTML Purifier.

This plugin provides the ability to run HTML Tidy through all your posts, pages, and comments, generating a report on just how dirty your code is.

This plugin adds the xmlns:addthis="http://www.addthis.com/help/api-spec" entry to the HTML tag. This head entry is required to make it Val …

Easily post source code such as PHP or HTML and display it in a styled box.

Check the doctype validity using W3c validator (html , xhtml , ... ) when creating or updating page / post / custom post type and show the result in …

Easily use highlightjs and line-numbers to syntax-highlighted sample code on your blog posts

Este Plugin nos muestra en cualquier lugar que se pueda añadir un Widget de texto los distintivos de validación de W3C Validator.

XVE (XVE Various Embed) is a simple yet powerful way to add media content to your WordPress blog.

This is a Advanced Business Application Programming (ABAP) brush for the "SyntaxHighlighter Evolved" plugin.

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

Requires at least 2.0.2 Test up to: 2.7.1 Stable tag: 2.7.1 This plugin works with a MoFuse account. This plugin will automatically detect and redir …

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

Sends public sites with the XHTML mime type. The internal sites, which have many XHTML errors, are still sent with the HTML mime type.

Converts all character entity references, which are forbidden in XHTML, into their corresponding characters.

Turns Flash embed code into well-formed XHTML by escaping object tags on the server side and unescaping them on the client side using JavaScript.

Allows templates to serve XHTML5 markup by adding the necessary JavaScript shim for IE7+ and by converting all new elements to divs and spans with app …