srFirst);
      assert.deepEqual(Array.from(ShadyDOM.nativeTree.children(el)), [srFirst, content, srLast])
    });

    test('fragment accessors', function() {
      let el = document.createDocumentFragment();
      let d1 = document.createElement('div');
      let d2 = document.createElement('div');
      el.appendChild(d1);
      el.appendChild(d2);
      assert.equal(ShadyDOM.nativeTree.parentNode(d1), el);
      assert.equal(ShadyDOM.nativeTree.nextElementSibling(d1), d2);
      assert.equal(ShadyDOM.na