The site A Different End Of The Internet is tested with Linkchecker. This test site contains 12 visible broken links (5 images and 7 clickable links).
At least 11 (out of this 12) broken links, or 9 (out of 10) broken links when the broken link checker respects robots.txt at the-linked-to-website, must be detected to get placed at the shortlist.
The following broken links are ...
Two "missed" broken links are blocked by robots.txt, so the score is 10/10. This broken link checker does meet the criteria for the shortlist. Hence it is placed at the (Cross platform) shortlist.