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Test Info:

<!DOCTYPE html>
<meta charset="utf-8">
<title>HTML Test: focus - the sequential focus navigation order with shadow dom and host is scrollable</title>
<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 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);
host.style = "overflow: scroll";
resetFocus();
// Focus should move in flat tree order since every one of them has tabindex==0,
// but doesn't include slots.
return assertFocusOrder(elementsInFlatTreeOrder.filter(el => (el !== slotAbove && el !== slotBelow)));
}, "Order when all tabindex=0 and host is scrollable");
</script>
</body>