Bad:
https://zorro-project.com/manual/ (links from this page)
https://zorro-project.com/manual/started.htm (as linked)
https://zorro-project.com/manual/testing.htm (as linked)

Good:
https://zorro-project.com/manual/toc.php
https://zorro-project.com/manual/en/started.htm
https://zorro-project.com/manual/en/testing.htm

Also bad:
From this page: https://zorro-project.com/docs.php
The link "Online Manual" is the first bad link listed earlier: https://zorro-project.com/manual/