ild incorrect');
    assert.equal(before.nextElementSibling, child, 'nextElementSibling incorrect');
    assert.equal(child.nextElementSibling, after, 'nextElementSibling incorrect');
    assert.equal(after.previousElementSibling, child, 'previousElementSibling incorrect');
    assert.equal(child.previousElementSibling, before, 'previousElementSibling incorrect');
  });

  test('element accessors (distribute)', function() {
    var parent = document.createElement('x-project');
    var child = document.creat