Well this is moving quickly! You can now spin up FedCM on your own website and log in to https://webmention.io thanks to this open source project from Sam Goto! This is so much better than having to type out your website or even email address when logging in! Full instructions here:
https://github.com/fedidcg/FedCM/issues/240#issuecomment-2118606184
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aaronpk_tv
@aaronpk @andypiper definitely gonna need to finish writing that oauth spec soon! Y'all are moving SO fast!