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Why does Guil say you "can't" have multiple elements with the same id and style them correctly?
In this video and the one before, Guil specifically says that id's are unique and that it "won't work" if you give two elements the same id and try to style them both with css, but it does work. Is this information just outdated? If not, and there is simply a reason you shouldn't use the same id (such as an anchor tag not knowing which id to reference), i'td be nice if the video mentioned the main reasons.