diff --git a/testing/web-platform/tests/credential-management/fedcm-loginhint.https.html b/testing/web-platform/tests/credential-management/fedcm-loginhint.https.html
new file mode 100644
index 0000000000000..0c70ce1713074
--- /dev/null
+++ b/testing/web-platform/tests/credential-management/fedcm-loginhint.https.html
@@ -0,0 +1,322 @@
+<
+!
+DOCTYPE
+html
+>
+<
+title
+>
+Federated
+Credential
+Management
+API
+login
+hint
+tests
+.
+<
+/
+title
+>
+<
+link
+rel
+=
+"
+help
+"
+href
+=
+"
+https
+:
+/
+/
+fedidcg
+.
+github
+.
+io
+/
+FedCM
+"
+>
+<
+script
+src
+=
+"
+/
+resources
+/
+testharness
+.
+js
+"
+>
+<
+/
+script
+>
+<
+script
+src
+=
+"
+/
+resources
+/
+testharnessreport
+.
+js
+"
+>
+<
+/
+script
+>
+<
+script
+src
+=
+"
+/
+service
+-
+workers
+/
+service
+-
+worker
+/
+resources
+/
+test
+-
+helpers
+.
+sub
+.
+js
+"
+>
+<
+/
+script
+>
+<
+body
+>
+<
+script
+type
+=
+"
+module
+"
+>
+import
+{
+fedcm_test
+request_options_with_login_hint
+select_manifest
+}
+from
+'
+.
+/
+support
+/
+fedcm
+-
+helper
+.
+sub
+.
+js
+'
+;
+fedcm_test
+(
+async
+t
+=
+>
+{
+let
+options
+=
+request_options_with_login_hint
+(
+'
+manifest
+.
+py
+'
+'
+nomatch
+'
+)
+;
+const
+cred
+=
+navigator
+.
+credentials
+.
+get
+(
+options
+)
+;
+return
+promise_rejects_dom
+(
+t
+"
+NetworkError
+"
+cred
+)
+;
+}
+"
+No
+login
+hint
+matches
+an
+account
+.
+"
+)
+;
+fedcm_test
+(
+async
+t
+=
+>
+{
+let
+options
+=
+request_options_with_login_hint
+(
+'
+manifest
+.
+py
+'
+'
+john_doe
+'
+)
+;
+const
+cred
+=
+await
+navigator
+.
+credentials
+.
+get
+(
+options
+)
+;
+assert_equals
+(
+cred
+.
+token
+'
+token
+'
+)
+;
+}
+"
+Login
+hint
+matches
+an
+account
+.
+"
+)
+;
+fedcm_test
+(
+async
+t
+=
+>
+{
+let
+options
+=
+request_options_with_login_hint
+(
+'
+manifest_with_two_accounts
+.
+json
+'
+'
+john_doe
+'
+)
+;
+await
+select_manifest
+(
+t
+options
+)
+;
+const
+cred
+=
+await
+navigator
+.
+credentials
+.
+get
+(
+options
+)
+;
+assert_equals
+(
+cred
+.
+token
+'
+account_id
+=
+john_doe
+'
+)
+;
+}
+"
+Login
+hint
+matches
+an
+account
+from
+two
+accounts
+.
+"
+)
+;
+<
+/
+script
+>
diff --git a/testing/web-platform/tests/credential-management/support/fedcm-helper.sub.js b/testing/web-platform/tests/credential-management/support/fedcm-helper.sub.js
index 13d3234517541..92ae1956fa7ce 100644
--- a/testing/web-platform/tests/credential-management/support/fedcm-helper.sub.js
+++ b/testing/web-platform/tests/credential-management/support/fedcm-helper.sub.js
@@ -707,3 +707,36 @@ manifest_url
 )
 ;
 }
+export
+function
+request_options_with_login_hint
+(
+manifest_filename
+login_hint
+)
+{
+let
+options
+=
+request_options_with_mediation_required
+(
+manifest_filename
+)
+;
+options
+.
+identity
+.
+providers
+[
+0
+]
+.
+loginHint
+=
+login_hint
+;
+return
+options
+;
+}
diff --git a/testing/web-platform/tests/credential-management/support/fedcm/accounts.py b/testing/web-platform/tests/credential-management/support/fedcm/accounts.py
index 7a8dfea581d5b..c3fe4203746b7 100644
--- a/testing/web-platform/tests/credential-management/support/fedcm/accounts.py
+++ b/testing/web-platform/tests/credential-management/support/fedcm/accounts.py
@@ -266,6 +266,16 @@
 789
 "
 ]
+   
+"
+login_hints
+"
+:
+[
+"
+john_doe
+"
+]
   
 }
 ]
diff --git a/testing/web-platform/tests/credential-management/support/fedcm/two_accounts.py b/testing/web-platform/tests/credential-management/support/fedcm/two_accounts.py
index 415cfaf693d49..42b5a802a0db6 100644
--- a/testing/web-platform/tests/credential-management/support/fedcm/two_accounts.py
+++ b/testing/web-platform/tests/credential-management/support/fedcm/two_accounts.py
@@ -338,6 +338,16 @@
 789
 "
 ]
+   
+"
+login_hints
+"
+:
+[
+"
+john_doe
+"
+]
   
 }