valid

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Per steps to be POSH, all web pages should be valid and pass the W3C validator: http://validator.w3.org/

You can get one-click validation favelets from http://favelets.com/

challenges

Sometimes it is difficult to make a page validate due to external content (e.g. adservers) or other editorial/publishing requirements. By documenting real-world examples of validation challenges, we can perhaps solve some of them, and turn those solutions into a validation FAQ to help others.

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