Bottom of the web buttons

[Csmiami]

I was just playing around the website, and saw the 4 buttons at the bottom of the site; as I have many times. Only this time, I decided to actually check where they they you, as I've seen similar webs use this as a sort of verifyer of whatever they have.

The 2 ones content "only" information and the link to the 2 on the right suggest they are indeed some sort of verification (license?) tool:

Code:

http://jigsaw.w3.org/css-validator/check/referer
http://validator.w3.org/check?uri=referer

I've stated a couple of times that I'm not really a tech guy, so I actually don't know what these 2 are supposed to verify, but the thing is none of them is actually working? They are working in a sense that the website loads, but one sends a forbidden error back, and the second one brings a "Sorry! This document cannot be checked." I also tried searching by url on that one, as it is suggested on the tab that is opened, and bitcointalk.org-->2 Errors, 1 warning(s)

So my question are as follows:

-What are these 2 guys?
-What are they supposed to validate?
-If they are not working or outdated, why are they there?

[ibminer]

-What are these 2 guys?
-What are they supposed to validate?
-If they are not working or outdated, why are they there?

They validate the HTML markup & CSS against the various standards set by W3C (depending on the version). Errors/warnings are somewhat common for most websites though. I'm guessing the links/icons are there because they are part of the footer SMF uses (forum software), unless theymos added them at some point.

They don't work because browsers don't automatically send the referrer when coming from https to http, so the URL would have to be included in the link:
(edit:.. or maybe https could just be added into the existing link)

Code:

https://validator.w3.org/check?uri=bitcointalk.org
https://jigsaw.w3.org/css-validator/validator?uri=bitcointalk.org

As for your last question... I doubt anyone really cares about these links.