1. Here is a normal paragraph.

2. Here is a normal paragraph.

3. Here is a normal paragraph.

4. Here is a paragraph with visibility=hidden

5. Here is a normal paragraph.

6. Here is a normal paragraph.

7. Here is a normal paragraph.

Paragraph 4 has the styling visibility=hidden. On Firefox 3/FC10, that paragraph is not seen, but a space is reserved for it.