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by daveoc64 1800 days ago
A JavaScript API has been considered as a replacement for the user agent string, but it has two big downsides:

1) JavaScript must be enabled. If it's not, then the server can't get any of the user agent data - at all.

2) The server won't get the user agent data until after it has already responded to the first request it receives from a client. That makes it a lot less useful overall. Having to load a page, then perhaps redirect the user using JS based on what the JS API says is a bit untidy.