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helps prevent cross-site scripting attacks, a.k.a. XSS attacks, by validating untrusted HTML against an XML schema that does include elements, attributes, and values that can be used for cross-site scripting attacks.. Untrusted HTML typically comes from an untrusted user (e.g. in a form submission or an email). NeatHtml consists of the NeatHtml schema definition and a .NET assembly that can be used to validate HTML fragments against the schema. It is open source and works under Mono, .NET 1.1, and .NET 2.0.