That's a pretty hard difficult to reach for a lot of websites. I mean, I don't think I've ever seen a single popular or large site out there actually reach it. Only site I entered that passed that test was Hacker News! And that was just barely.

A lot of the other checks seem like no one ever bothers with them either. Is that a good thing? Probably not, but 90+% of the internet would fail HTML or CSS validation.

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