focus-tabindex-order-shadow-zero-host-not-set.html

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This WPT test may be referenced by the following Test IDs:
- /shadow-dom/focus/focus-tabindex-order-shadow-zero-host-not-set.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>HTML Test: focus - the sequential focus navigation order with shadow dom and 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>

//    #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]);

  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 host (tabindex not set)");

</script>

</body>