This plugin attempts to take arbitrary posts and comments and transform them into valid XHTML, a standard that describes how web-pages should be written. WordPress itself is already XHTML valid, but the same cannot be necessarily said of post content itself. It is especially hard to guarantee that your comment posters will conform to these standards, which could theoretically lead to your site displaying incorrectly.

X-Valid covers a wide range of markup errors, and is configurable via a menu interface which can be found as a Plugins submenu.

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