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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>HTML Test: focus - the sequential focus navigation order with shadow dom that delegates focus and all tabindex=-1 in shadow tree</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=0>
+// <div #host tabindex=0>
+//    #shadowRoot (delegatesFocus)
+//      <div #aboveSlot tabindex=-1>
+//      <slot #slotAbove tabindex=-1>
+//        (slotted) <div #slottedAbove tabindex=-1>
+//      <slot #slotBelow tabindex=-1>
+//        (slotted) <div #slottedBelow tabindex=-1>
+//      <div #belowSlot tabindex=-1>
+// <div #belowHost tabindex=0>
+
+promise_test(() => {
+  let elementsInFlatTreeOrder;
+  let [aboveHost, host, aboveSlot, slotAbove, slottedAbove, slotBelow, slottedBelow, belowSlot, belowHost] = elementsInFlatTreeOrder = prepareDOM(document.body, true);
+  setTabIndex(elementsInFlatTreeOrder, -1);
+  setTabIndex([aboveHost, host, belowHost], 0);
+  resetFocus();
+  // Focus should only land on #aboveHost and #belowHost (all others are non-sequentially focusable).
+  return assertFocusOrder([aboveHost, belowHost]);
+}, "Order when all tabindex=-1 is and delegatesFocus = true");
+</script>
+</body>