'How does work env() function in css. not only on iphone, but pc browsers and android phones too

please help me if you can...

I've tried understand this function and read many articles about it, but some questions have been raised about this feature․

  1. Is the env() function only for iPhones?
  2. If not, in which case should you use the env() function in the case of a computer browser?
  3. If we can specify "content =" viewport-fit = contain "or" content = "viewport-fit = auto" in the meta tag, then why use "content =" viewport-fit = cover " and with it the env () function.?
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