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If you're doing user-agent detection, your code is broken by design. Use feature detection instead.

Please. I'm tired of having to use an extension to spoof user-agent in order for some websites to work. The creators of the Vivaldi browser were even forced to permanently spoof Chrome's user-agent due to websites unrecognizing the Vivaldi one.

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In general yes. In some specialty cases user agent detection is fine, e.g. if the application has critical and specific requirements on what software/hardware stack it should be ran on and has been tested for. Just because a feature has been detected to exist in the browser doesn't mean it works correctly, after all. But even in these cases, detecting a non-supported browser should throw a warning, not prevent you from accessing a site.

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