Simple Markup Validator A simple markup validator add-on for Mozilla Firefox
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W3C markup W3C validator validate validate markup

Simple Markup Validator Description

Simple Markup Validator is a Firefox extension that implements a button on the navigation toolbar, enabling web masters to effortlessly validate a website using the W3C validation service. Simple Markup Validator is an open source add-on designed to work with Mozilla Firefox 4.0 and later. Product's homepage

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