Contact emails

n...@chromium.org

Explainer

https://github.com/w3c-fedid/multi-idp/blob/main/README.md

Specification

PR will be written for https://w3c-fedid.github.io/FedCM/

Summary

Allows FedCM to show multiple identity providers in the same dialog. This 
provides developers with a convenient way to present all supported identity 
providers to users. We are planning to first tackle the simple case of 
having all providers in the same get() call.

Blink component

Blink>Identity>FedCM 
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EIdentity%3EFedCM>

TAG review

https://github.com/w3ctag/design-reviews/issues/803

TAG review status

Pending

Origin Trial Name

FedCM Multiple Identity Providers

Chromium Trial Name

FedCmMultipleIdentityProviders

Origin Trial documentation link

https://developers.google.com/privacy-sandbox/blog/fedcm-chrome-128-updates#origin_trial_multi_idp_api

WebFeature UseCounter name

kFedCmMultipleIdentityProviders

Risks

Interoperability and Compatibility

This should not have additional interop risks on top of the existing FedCM 
API which is generally supported but not yet implemented by Firefox and 
Safari.


Gecko: No signal (https://github.com/mozilla/standards-positions/issues/730) 
but we have heard positive feedback 
<https://github.com/mozilla/standards-positions/issues/730#issuecomment-1961733855>
 
that this is needed for FedCM

WebKit: Closed Without a Position (
https://github.com/WebKit/standards-positions/issues/120)

Web developers: Positive (https://github.com/w3c-fedid/multi-idp/issues/2)

Ergonomics

Using this API will just require expanding the get() to use more providers, 
so it will benefit from the ergonomics of the initial FedCM API.

Activation

The main activation issue is having to include all IDPs in the same get() 
call, which is tough because IDPs generally are independent from each 
other. That said, solving this problem has been proved to be very 
challenging, and we do have developers who can use the single get() call, 
so we wish to start with the simpler version of multi IDP support.


Security

The security considerations are similar to those of the single IDP case. We 
do not require users to input usernames and passwords for spoofing 
concerns, and we also have input protection to prevent accidental click 
right after the UI is shown.


WebView application risks

Does this intent deprecate or change behavior of existing APIs, such that 
it has potentially high risk for Android WebView-based applications?


Goals for experimentation

Gather UX feedback and determine whether the API shape is sufficient for 
use cases where multiple IdPs can collaborate in a single JS call.

Reason this experiment is being extended

Our partner remains committed to experimentation and they have been working 
with their relying parties to experiment, but this has taken longer than 
expected.

Ongoing technical constraints

None

Debuggability

The debug tools are similar to that of original FedCM: console messages and 
DevTools issues. Seeing FedCM network requests is not supported in DevTools 
but can be achieved via net-export.


Will this feature be supported on all six Blink platforms (Windows, Mac, 
Linux, ChromeOS, Android, and Android WebView)?

No

As with the initial FedCM, we do not support Android WebView.


Is this feature fully tested by web-platform-tests 
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
?

Yes

https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/web_tests/external/wpt/fedcm/fedcm-multi-idp/

Flag name on about://flags

FedCmMultiIdp

Finch feature name

FedCmMultipleIdentityProviders

Requires code in //chrome?

True

Tracking bug

https://bugs.chromium.org/p/chromium/issues/detail?id=1348262

Launch bug

https://launch.corp.google.com/launch/4229762

Estimated milestones

Origin trial desktop first

128

Origin trial desktop last

132

Origin trial extension 1 end milestone

136

DevTrial on desktop

122
Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/5067784766095360?gate=4898496946372608

Links to previous Intent discussions

Intent to Experiment: 
https://groups.google.com/a/chromium.org/d/msgid/blink-dev/9c4ae5a9-5f36-4421-82c6-07b676ef768cn%40chromium.org


This intent message was generated by Chrome Platform Status 
<https://chromestatus.com/>.

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