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> A simple transparent GIF should be enough to send the UA to an analytics server (or use Google Analytics)

That's a hell of a scope creep.

90% of global browsers.

I believe you can import your Google Analytics data into http://caniuse.com for this depth of information.

What browsers are considered in this percentage?

If 27 (lots of obscure) browsers support it, but 3 major ones (e.g. chrome, firefox, ie) don't, is it considered 90%?