This node submits URL(s) to W3C Nu HTML Validator service to evaluate quality of the HTML source. It uses W3C's host https://validator.w3.org/nu/ by default. Note that there is an unpublicized quota limit on W3C's host. Sending a large batch of URLs through this node to W3C's host can result in your IP being banned from their website. To avoid exceeding their quota limit, you should consider setting up your own validator host. You can follow their instruction to set up your own host.
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