;
    await focusNext();
    assert_equals(document.activeElement, c0);
    await focusNext();
    assert_equals(document.activeElement, c1first);
  }, "Column #0");

  promise_test(async t => {
    await activateMarker(4);
    await focusNext();
    assert_equals(document.activeElement, flex4);
    await focusNext();
    assert_equals(document.activeElement, flex5);
    await focusNext();
    assert_equals(document.activeElement, flex6);
    await focusNext();
    assert_equals(document.activeElement, afte