<https://laminutedecode.io/courses/css-de-a-a-z/lesson/brouillon-de-la-lecon-2/#breadcrumb>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://laminutedecode.io/courses/css/lesson/brouillon-de-la-lecon-2/>