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I have yet to see anyone independently verify this, but to me it seems that Google fonts sends different versions of fonts, depending on the user agent.

Downloading a font and using it on a different operating system from where the original download comes from seems to make the font look... unusual?

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Google acknowledges this themselves, and it's mostly for compatibility reasons. Serving TTF to old browsers and WOFF for newer ones for example. Easy to verify yourself, make a request to the stylesheet from internet explorer and compare with the response you get if you make a request from a chromium-like browser, it'll serve you different contents.

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