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diff --git a/testing/web-platform/tests/keyboard-map/navigator-keyboard-map-two-parallel-requests.https.html b/testing/web-platform/tests/keyboard-map/navigator-keyboard-map-two-parallel-requests.https.html
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+++ b/testing/web-platform/tests/keyboard-map/navigator-keyboard-map-two-parallel-requests.https.html
@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+'use strict';
+
+promise_test((t) => {
+ const p1 = navigator.keyboard.getLayoutMap();
+ const p2 = navigator.keyboard.getLayoutMap();
+ // p1 and p2 should be the same promise instance.
+ assert_equals(p1, p2);
+ return Promise.all([p1, p2]);
+}, '[Keyboard Map] getLayoutMap() twice in parallel');
+
+</script>