The people who are using W3Schools are, almost by definition, the kinds of people who don't know that the site has glaring errors, and can't spot when the page they're looking at is wrong.
Imagine if you were using a calculator to help calculate dimensions for a house. But unknown to you, 1 in 20 calculations you make came out with an answer that was 10% out. Is that calculator useful because 95% of the time you get the correct answer, much faster than you could have found it yourself?
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