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Developer's DescriptionBy Michael LangleyPerform a page validation using the W3C Markup Validation Service.Validates a page using the W3C Markup Validation Service. Adds an option to the right-click context menu and to the Tools menu to allow for easy validation of the current page. Opens the results in a new tab. This is a simple extension that will work only for online pages. The W3C Markup Validation Service now allows you to validate behind a site secured with HTAccess by allowing you to login for it.