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diff --git a/testing/web-platform/tests/webauthn/createcredential-large-blob-supported.https.html b/testing/web-platform/tests/webauthn/createcredential-large-blob-supported.https.html
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index 0000000000..5c07745a49
--- /dev/null
+++ b/testing/web-platform/tests/webauthn/createcredential-large-blob-supported.https.html
@@ -0,0 +1,82 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>navigator.credentials.create() largeBlob extension tests with authenticator support</title>
+<meta name="timeout" content="long">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src=helpers.js></script>
+<body></body>
+<script>
+standardSetup(function() {
+  "use strict";
+
+  promise_test(async t => {
+    const credential = await createCredential({
+      options: {
+        publicKey: {
+          authenticatorSelection: {
+            requireResidentKey: true,
+          },
+          extensions: {
+            largeBlob: {
+              support: "preferred",
+            },
+          },
+        },
+      },
+    });
+    assert_own_property(credential.getClientExtensionResults(), "largeBlob");
+    assert_true(credential.getClientExtensionResults().largeBlob.supported);
+    assert_not_own_property(credential.getClientExtensionResults().largeBlob, "blob");
+    assert_not_own_property(credential.getClientExtensionResults().largeBlob, "written");
+  }, "navigator.credentials.create() with largeBlob.support set to preferred and supported by authenticator");
+
+  promise_test(async t => {
+    const credential = await createCredential({
+      options: {
+        publicKey: {
+          authenticatorSelection: {
+            requireResidentKey: true,
+          },
+          extensions: {
+            largeBlob: {},
+          },
+        },
+      },
+    });
+    assert_own_property(credential.getClientExtensionResults(), "largeBlob");
+    assert_true(credential.getClientExtensionResults().largeBlob.supported);
+    assert_not_own_property(credential.getClientExtensionResults().largeBlob, "blob");
+    assert_not_own_property(credential.getClientExtensionResults().largeBlob, "written");
+  }, "navigator.credentials.create() with largeBlob.support not set and supported by authenticator");
+
+  promise_test(async t => {
+    const credential = await createCredential({
+      options: {
+        publicKey: {
+          authenticatorSelection: {
+            requireResidentKey: true,
+          },
+          extensions: {
+            largeBlob: {
+              support: "required"
+            },
+          },
+        },
+      },
+    });
+    assert_own_property(credential.getClientExtensionResults(), "largeBlob");
+    assert_true(credential.getClientExtensionResults().largeBlob.supported);
+    assert_not_own_property(credential.getClientExtensionResults().largeBlob, "blob");
+    assert_not_own_property(credential.getClientExtensionResults().largeBlob, "written");
+  }, "navigator.credentials.create() with largeBlob.support set to required and supported by authenticator");
+}, {
+  protocol: "ctap2_1",
+  hasResidentKey: true,
+  hasUserVerification: true,
+  isUserVerified: true,
+  extensions: ["largeBlob"],
+});
+</script>