This notion of a "user agent" is a holdover from a more civilized age, when technologists tried to to build a new digital space where tech served users.
A browser that's a "user agent" is a comforting thought. An agent's job is to serve you and your interests. When you tell it to fetch a page, your agent should figure out how to get that page, make sense of the code that's embedded in, and render the page in a way that represents its best guess of how you'd like the page seen.
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