It is integrated into the W3C credential management specification andso it is called via navigator.credentials.create andnavigator.credentials.get. This document is about understanding thedeeper structures that underpin web authentication rather thanbeing a guide as to its details. So we will leave a great many detailsto the numerous guides to WebAuthn that already exist on the web andinstead focus on how structures from U2F were carried over into WebAuthnand updated.