A laptop displaying lines of code
  • VersionDude
  • Status: Maintained elsewhere

Validator.nu is an HTML5 conformance checker. Its syntax schemas, checker (/whattf/syntax/, org.whattf.checker) and build tooling were developed in repositories hosted here.

It is now maintained as the Nu HTML Checker and is widely used to validate web documents against the living standard.

Source code shown in a code editor.
Source code shown in a code editor.

Current home

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