Broken Links @ Chapter 1: HOW DID WE GET HERE?

According to: http://validator.w3.org/checklink?uri=http%3A%2F%2Fdiveintohtml5.info%2Fpast.html&hide_type=all&depth=&check=Check

There are 2 broken links.

Line: 152 http://www.whatwg.org/specs/web-apps/current-work/multipage/video.html
Status: 404 Not Found
The link is broken. Double-check that you have not made any typo, or mistake in copy-pasting. If the link points to a resource that no longer exists, you may want to remove or fix the link.

Broken fragments:
http://www.whatwg.org/specs/web-apps/current-work/multipage/video.html#audio (line 152)
http://www.whatwg.org/specs/web-apps/current-work/multipage/video.html#video (line 152)