ALT+Enter on Essential Components of Web Accessibility page

I was reading your Essential Components of Web Accessibility page at

https://www.w3.org/WAI/fundamentals/components/#main

There are several illustrations where JAWS says use ALT+Enter for long description. For every illustration, ALT+Enter results in a page with 404 error..

Thanks.

Carolyn Barker
Certified PSM I
Engineering, Sciences & Technology - East / Cyber Analytics
Northrop Grumman Mission Systems
703-819-3997