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Hopefully someone more knowledgeable will chime in as I'm waiting for FIDO U2F support as well but I think CTAP2 is the browser-to-user layer of FIDO.

edit: just tested it on Mojave with gmail and fastmail and it doesn't recognize that the Yubikey has been inserted, so looks like support is not there out-of-the-box

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As far as I understand it, it is. That said, I tried to use this for a WebAuthn Django library I'm trying to write and it wouldn't work, as pages wouldn't render at all.

You need to enable it in Develop->Experimental Features, but also you need to be sure you have a CTAP2 key. "U2F" keys are all CTAP1, which is not supported yet. Yubi's 5 series are CTAP2, as are the blue keys with a 2 printed on them.

Cool I just tried it with Fastmail and a Yubikey 5 and it worked. Gmail however still checks if you're running chrome so it doesn't work.

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