Finally the site passed the check. To achieve that I had to remove all the target=”_blank” links that I often use. I hope to integrate the BBcode module so that thing had to go anyway.
I’m also working on the structure of the site to understand how Drupal works and how I can manage at best the four-page layout I had in the other MT-powered blog (Cesspit, F00lies, Ravings and Bloggie). Then the hardest part will be about moving the MT database to Drupal since I don’t want to keep both.