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Many people think that assessing browser capabilities by inspecting the user-agent identifier of the browser is a really bad idea. In fact, it's really OK, and literally all major websites do it.
Polyfill.io recommends using server-side feature detection for better performance and accuracy (detection is not always as straightforward as a simple
('thing' in OtherThing)) but for people who still want to do feature detection client side, this demo proves that polyfill.io does support that.