Comment dire:

https://validator.w3.org/check?uri=http%3A%2F%2Ftigcc.ticalc.org%2F&charset=%28detect+automatically%29&doctype=Inline&group=0

https://validator.w3.org/check?uri=https%3A%2F%2Fwww.tigen.org%2Fkevin.kofler%2F&charset=%28detect+automatically%29&doctype=Inline&group=0&user-agent=W3C_Validator%2F1.3+http%3A%2F%2Fvalidator.w3.org%2Fservices


PS: toi qui veux absolument que tout revienne a l'HTML 1.0/2.0:
https://validator.w3.org/check?uri=https%3A%2F%2Fwww.tigen.org%2Fkevin.kofler%2F&charset=%28detect+automatically%29&doctype=HTML+2.0&group=0&user-agent=W3C_Validator%2F1.3+http%3A%2F%2Fvalidator.w3.org%2Fservices

Va falloir revoir ton site.