This permalink applies to the outer ARTICLE element (which could be, e.g., a blog post).
This permalink applies to the inner ARTICLE element (which could be, e.g., a blog comment).
This permalink applies to only the content from the first H2 to the second H2. The DIV isn't exactly that section, but it roughly corresponds to it.
This permalink applies to the outer ARTICLE element (which could be, e.g., a blog post).
This permalink applies to the inner ARTICLE element (which could be, e.g., a blog comment).