(X)HTML5 Checker
ulmdesign tarafından
Gizlilik sözleşmesi
The add-on uses the HTML validation service APIs available on this page - https://validator.w3.org/nu/. If you wish to receive more information on the validation of the html code offered by W3C you can find all the information on this page - https://validator.w3.org/nu/about.html