  test('element accessors (no distribute)', function() {
    var parent = document.createElement('x-test-no-distribute');
    var child = document.createElement('div');
    parent.appendChild(child);
    var before = document.createElement('div');
    var after = document.createElement('div');
    parent.insertBefore(before, child);
    parent.appendChild(after);
    assert.equal(parent.firstElementChild, before, 'firstElementChild incorrect');
    assert.equal(parent.lastElementChild, after, 'lastElementCh