Linking outside of project is allowed

[fidian]

I have HTML help files. Sometimes they are at https://example.com/ and other times at https://special-app.example.com/help/. Linking from index.html to ../ should be disallowed because it goes outside of the root of the project.

Workaround:

Set baseURL to "/some-directory-that-does-not-exist" and link checking seems to work. However, this doesn't really feel right to allow linking outside of the project.