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Web dev: What browser is visiting the page?
User agent string:
A screenshot of a browser. The URL bar reads firefox://settings, a button on the URL bar is labelled Netscape, a popup from the button reads: “You’re viewing a secure Opera page”, and the web page title reads “Chrome settings”.
User agents are essentially deprecated and are going to become less and less useful over time. The replacement is either client hints or feature detection, depending on what you’re using it for.