Please upgrade here. These earlier versions are no longer being updated and have security issues.
HackerOne users: Testing against this community violates our program's Terms of Service and will result in your bounty being denied.
In trouble? The upgraded W3c Validator may be your best ally
The new interface at http://validator.w3.org/unicorn/ maybe can clarify the issues so at least you will know where to look for a solution.
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