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diff --git a/testing/web-platform/tests/shadow-dom/focus/focus-tabindex-order-shadow-varying-tabindex.html b/testing/web-platform/tests/shadow-dom/focus/focus-tabindex-order-shadow-varying-tabindex.html
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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>HTML Test: focus - the sequential focus navigation order with 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>
+// Structure:
+// <div #aboveHost tabindex=3>
+// <div #host tabindex=3>
+//    #shadowRoot
+//      <div #aboveSlot tabindex=2>
+//      <slot #slotAbove tabindex=1>
+//        (slotted) <div #slottedAbove tabindex=4>
+//      <slot #slotBelow tabindex=1>
+//        (slotted) <div #slottedBelow tabindex=4>
+//      <div #belowSlot tabindex=2>
+// <div #belowHost tabindex=3>
+
+promise_test(() => {
+  let elementsInFlatTreeOrder;
+  let [aboveHost, host, aboveSlot, slotAbove, slottedAbove, slotBelow, slottedBelow, belowSlot, belowHost] =
+    elementsInFlatTreeOrder = prepareDOM(document.body, false);
+  setTabIndex([slotAbove, slotBelow], 1);
+  setTabIndex([aboveSlot, belowSlot], 2);
+  setTabIndex([aboveHost, host, belowHost], 3);
+  setTabIndex([slottedAbove, slottedBelow], 4);
+  resetFocus();
+  return assertFocusOrder([aboveHost, host, slottedAbove, slottedBelow, aboveSlot, belowSlot, belowHost]);
+}, "Order with various tabindex values");
+</script>
+</body>