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chromium/third_party/blink/web_tests/external/wpt/html/interaction/focus/focusgroup/tentative/forward-navigation/vertical/skips-focusgroup-that-extends-in-orthogonal-axis.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>HTML Test: focusgroup - Focus moves to next item, skipping the focusgroup that extends in the orthogonal axis.</title>
<link rel="author" title="Microsoft" href="http://www.microsoft.com/">
<link rel="help" href="https://open-ui.org/components/focusgroup.explainer/">
<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/testdriver-actions.js"></script>
<script src="../../resources/focusgroup-utils.js"></script>

<div id=root focusgroup>
  <div id=item1 tabindex=0 focusgroup="extend inline">
    <span id=item2 tabindex=-1>item2</span>
  </div>
  <span id=item3 tabindex=-1>item3</span>
</div>

<script>

  promise_test(async t => {
    var item1 = document.getElementById("item1");
    var item3 = document.getElementById("item3");

    await focusAndKeyPress(item1, kArrowDown);
    assert_equals(document.activeElement, item3);
  }, "When the focus is set on an extending focusgroup element but that focusgroup doesn't support the axis of the arrow key pressed, skip that subtree altogether.");

</script>