third_party/WebKit/LayoutTests/fast/dom/MutationObserver/observe-options-character-data.html

   1 <!DOCTYPE html>
   2 <script src="../../../resources/js-test.js"></script>
   3 <script>
   4
   5 description('Test MutationObserver.observe options related to character data');
   6
   7 var observer = new MutationObserver(function() {});
   8 var text = document.createTextNode('0');
   9
  10 observer.observe(text, {characterDataOldValue: true});
  11 text.data = '1';
  12 var records = observer.takeRecords();
  13 shouldBe('records.length', '1');
  14 shouldBeEqualToString('records[0].oldValue', '0');
  15 observer.disconnect();
  16
  17 observer.observe(text, {characterDataOldValue: false});
  18 text.data = '2';
  19 var records = observer.takeRecords();
  20 shouldBe('records.length', '1');
  21 shouldBeNull('records[0].oldValue');
  22 observer.disconnect();
  23
  24 </script>