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diff --git a/testing/web-platform/tests/shadow-dom/focus/focus-tabindex-order-shadow-zero-host-not-set-scrollable.html b/testing/web-platform/tests/shadow-dom/focus/focus-tabindex-order-shadow-zero-host-not-set-scrollable.html
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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>HTML Test: focus - the sequential focus navigation order with shadow dom and scrollable/non-focusable host</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 style="overflow: scroll">
+// #shadowRoot
+// <div #aboveSlot tabindex=0>
+// <slot #slotAbove tabindex=0>
+// (slotted) <div #slottedAbove tabindex=0>
+// <slot #slotBelow tabindex=0>
+// (slotted) <div #slottedBelow tabindex=0>
+// <div #belowSlot tabindex=0>
+// <div #belowHost tabindex=0>
+
+promise_test(() => {
+ let elementsInFlatTreeOrder;
+ let [aboveHost, host, aboveSlot, slotAbove, slottedAbove, slotBelow, slottedBelow, belowSlot, belowHost] =
+ elementsInFlatTreeOrder = prepareDOM(document.body, false);
+ setTabIndex(elementsInFlatTreeOrder, 0);
+ removeTabIndex([host]);
+ host.style = "overflow: scroll";
+ resetFocus();
+ // Focus should move in flat tree order since every one of them has tabindex ==0,
+ // but doesn't include #slot since it's not rendered and #host since its tabindex is not set
+ // (but #host is considered as 0 in focus scope navigation, keeping the flat tree order for the shadow root's descendants).
+ return assertFocusOrder(elementsInFlatTreeOrder.filter(el => (el !== slotAbove && el !== slotBelow && el !== host)));
+}, "Order when all tabindex=0 except scrollable host (tabindex not set)");
+</script>
+</body>