 function() {
    var divOwner = document.createElement('span');
    document.body.appendChild(divOwner);
    divOwner.attachShadow({mode: 'open'}).appendChild(div);
    var bcr = divOwner.getBoundingClientRect();
    var x = bcr.left+10, y = bcr.top+10;
    var actual = deepTargetFind(x, y);
    assert.equal(actual, div);
  });

  test('find the div with a shadowroot inside a shadowroot', function() {
    div.attachShadow({mode: 'open'});
    var divOwner = document.createElement('span');
    document.body