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Re:Show HN: This page exists only if someone is looking at it by vincentkriek on Tuesday May 12, 2015 @02:55PM (#9534027)
Being wrong is very different from not existing. As long as a spec is a guideline there are people doing it wrong, I guarantee you that.

There are links that do that and if google were to follow every linkt people would notice very fast.

Re:Show HN: This page exists only if someone is looking at it by gwillen on Tuesday May 12, 2015 @07:10PM (#9535611)
Google does follow every link, and those people do notice, because their forums get deleted. Very few people do it this wrong for very long.

(Or they get fed up and patch the problem without understanding it, by using robots.txt to block all crawlers from their site.)