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diff --git a/testing/web-platform/tests/shadow-dom/focus/focus-tabindex-order-shadow-varying-tabindex-3.html b/testing/web-platform/tests/shadow-dom/focus/focus-tabindex-order-shadow-varying-tabindex-3.html
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+++ b/testing/web-platform/tests/shadow-dom/focus/focus-tabindex-order-shadow-varying-tabindex-3.html
@@ -0,0 +1,80 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>HTML Test: focus - the sequential focus navigation order with nested shadow dom with varying tabindex values</title>
+<link rel="help" href="https://html.spec.whatwg.org/multipage/interaction.html#sequential-focus-navigation">
+<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/shadow-utils.js"></script>
+<body>
+<script>
+promise_test(async () => {
+  function createButtonInShadowDOM(host, parent) {
+    const root = host.attachShadow({mode: "open"});
+    root.innerHTML = "<input>";
+    parent.appendChild(host);
+    return root;
+  }
+
+  const host1 = document.createElement("div");
+  const root1 = createButtonInShadowDOM(host1, document.body);
+
+  const forwarder = document.createElement("div");
+  forwarder.setAttribute("tabindex", 0);
+  document.body.appendChild(forwarder);
+
+  const host2 = document.createElement("div");
+  host2.setAttribute("tabindex", -1);
+  const root2 = host2.attachShadow({mode: "open"});
+  document.body.appendChild(host2);
+
+  const host2_1 = document.createElement("div");
+  const root2_1 = createButtonInShadowDOM(host2_1, root2);
+
+  const host2_2 = document.createElement("div");
+  host2_2.setAttribute("tabindex", -1);
+  const root2_2 = createButtonInShadowDOM(host2_2, root2);
+
+  const host2_3 = document.createElement("div");
+  const root2_3 = createButtonInShadowDOM(host2_3, root2);
+
+  root1.querySelector("input").focus();
+
+  let forwarderFocused = false;
+  forwarder.addEventListener("focus", () => {
+    forwarderFocused = true;
+    root2_2.querySelector("input").focus();
+  });
+
+  // Structure:
+  // <div #host1></div>
+  //   #ShadowRoot
+  //     <button>Button</button>
+  // <div #forwarder tabindex=0></div>
+  // <div #host2 tabindex=-1></div>
+  //   #ShadowRoot
+  //     <div #host2_1></div>
+  //       #ShadowRoot
+  //         <button>Button</button>
+  //     <div #host2_2 tabindex=-1></div>
+  //       #ShadowRoot
+  //         <button>Button</button>
+  //     <div #host2_3></div>
+  //       #ShadowRoot
+  //         <button>Button</button>
+  assert_equals(document.activeElement, host1);
+  assert_equals(root1.activeElement, root1.querySelector("input"));
+
+  await navigateFocusForward();
+  assert_true(forwarderFocused);
+  assert_equals(document.activeElement, host2);
+  assert_equals(root2_2.activeElement, root2_2.querySelector("input"));
+
+  // In buggy Firefox build, the following focus navigation will
+  // move the focus back to #host1_1's button.
+  await navigateFocusForward();
+  assert_equals(document.activeElement, host2);
+  assert_equals(root2_3.activeElement, root2_3.querySelector("input"));
+}, "Order with different tabindex on host")
+</script>