Hoping Apple announce something in June. In the UK and North America iOS accounts for ~56% of mobile internet devices, Android accounts for 42%. Really hard for anyone to deploy this at scale until that changes.
I am slotting this for 2.4, very unlikely we will get it done for 2.3 but who knows.
News on this:
Firefox just enabled the older U2F registration method by default for the next release, due to historical raisins in Android. (WebAuthn was already enabled.)
https://groups.google.com/d/msg/mozilla.dev.platform/q5cj38hGTEA/1IKq9vSDAwAJ
I definitely like this for 2.4, seems like all major browsers are on board except iOS 
Is the plan to allow password-less login with webauthn or just second factor?
Ideally both, is what I am thinking.
Update: NFC-based webauthn has just landed in Firefox Beta for Android, if I understand it correctly.
双因素认证现在拥有专属的设置界面:
期待 U2F 支持,目前已在多个地方使用。
这将会发生,已在路线图之中:Discourse Version 2.4
我想讨论的一件事是,我们如何在 Discourse 中使用 WebAuthn。它仅仅作为一种双因素认证(2FA)的替代方式吗?还是我们可以将其作为一种替代的登录方式,类似于社交或邮箱登录(取代用户名/密码)?
U2F 已逝,WebAuthn 万岁