W3c Markup Validation Service
Posted by
Vincenzo Rubanoon · one minute reading.This web service provided by the World Wide Web Consortium (W3C) allows you to easily check wether your web page conforms to the specification of the language it is written into (e.g. HTML). Creating document that can be validated according to language specifications is essential in order to make them accessible.
The service allows to validate content either by pasting an URL pointing to it /that must be publicly available), uploading its source code or pasting a file that contains it.