end', '<d></d><e></e>');        assert.equal(a.innerHTML, '<b></b><d></d><e></e><c></c>');       var d = b.nextSibling;       var e = d.nextSibling;        var records = observer.takeRecords();       assert.equal(records.length, 0);       expectMutationRecord(records[0], {         type: 'childList',         target: a,         addedNodes: [d, e],         previousSibling: b,         nextSibling: c       });     });      test('