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diff --git a/testing/web-platform/tests/html/interaction/focus/focusgroup/tentative/backward-navigation/skips-non-focusgroup-subtree.html b/testing/web-platform/tests/html/interaction/focus/focusgroup/tentative/backward-navigation/skips-non-focusgroup-subtree.html
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+++ b/testing/web-platform/tests/html/interaction/focus/focusgroup/tentative/backward-navigation/skips-non-focusgroup-subtree.html
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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>HTML Test: focusgroup - Focus moves to previous item, skipping over a subtree that isn't an extending focusgroup.</title>
+<link rel="author" title="Microsoft" href="http://www.microsoft.com/">
+<link rel="help" href="https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/main/Focusgroup/explainer.md">
+<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="/resources/testdriver-actions.js"></script>
+<script src="../resources/focusgroup-utils.js"></script>
+
+<div focusgroup=wrap>
+  <span id=item1 tabindex=0>item1</span>
+  <div>
+    <span id=item2 tabindex=-1>item2</span>
+    <span id=item3 tabindex=-1>item3</span>
+  </div>
+  <span id=item4 tabindex=-1>item4</span>
+</div>
+
+<script>
+
+  promise_test(async t => {
+    var item1 = document.getElementById("item1");
+    var item4 = document.getElementById("item4");
+
+    await focusAndKeyPress(item4, kArrowUp);
+    assert_equals(document.activeElement, item1);
+
+    await focusAndKeyPress(item4, kArrowLeft);
+    assert_equals(document.activeElement, item1);
+  }, "When the focus is set on the last item of a focusgroup and the previous item is located past a non-focusgroup subtree, a backward arrow key press should move the focus to that previous item without getting stuck in the subtree.");
+
+</script>
+\ No newline at end of file