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[docs] Document passwordless account creation with passkeys in Blazor Web Apps - #2

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Source: dotnet/aspnetcore#68648

Documentation confidence: 75/100

Conceptual documentation: Required

Passwordless account creation with passkeys is a new user-visible capability (registration without a password, via a new anonymous /PasskeyRegistrationOptions endpoint and a "Sign up with a passkey" option on the Register page). This is documented by extending the existing canonical article (xref:security/authentication/passkeys/blazor) rather than creating a new article, since it is the established home for Blazor passkey implementation guidance.

Migration guidance: Not required

This is an additive, opt-in capability for new Blazor Web App projects. Existing apps aren't required to change anything to keep working.

Breaking-change documentation: Not required

No API removals, no changed defaults for existing apps, and no evidence of a breaking-change label or section in the source PR. The change only adds new endpoints/behavior.

Summary of documentation change

Updated aspnetcore/security/authentication/passkeys/blazor.md:

  • Added a >= aspnetcore-12.0 moniker section under "Add passkey endpoints" describing the new anonymous /PasskeyRegistrationOptions endpoint and its email validation behavior.
  • Added a new >= aspnetcore-12.0 moniker section, "Sign up with a passkey during registration," describing the new Sign up with a passkey option on the Register page and how the flow works end to end.
  • Updated ms.date and added ai-usage: ai-assisted metadata.

Files modified

  • aspnetcore/security/authentication/passkeys/blazor.md

Notes

  • Source PR base branch is main; the current highest release/* branch in dotnet/aspnetcore is release/11.0, so main represents ASP.NET Core 12.0 (milestone 12.0-preview1 corroborates this).
  • The source PR also modifies Login.razor to fix a same-cookie race condition between concurrent passkey ceremonies (a bug fix), which per the What's New include rules isn't included as new-feature content, and Blazor content is excluded from What's New includes entirely.

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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@DeagleGross DeagleGross added the documentation Improvements or additions to documentation label Sep 18, 2026
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