third_party/WebKit/LayoutTests/fast/dom/MutationObserver/delivery-order.html

   1 <!DOCTYPE html>
   2 <script src="../../../resources/js-test.js"></script>
   3 <script>
   4 window.jsTestIsAsync = true;
   5
   6 description('Test that MutationObservers are delivered to in order of creation.');
   7 function finish() {
   8     shouldBe('order.length', '10');
   9     shouldBe('order[0]', '0');
  10     shouldBe('order[1]', '1');
  11     shouldBe('order[2]', '2');
  12     shouldBe('order[3]', '3');
  13     shouldBe('order[4]', '4');
  14     shouldBe('order[5]', '5');
  15     shouldBe('order[6]', '6');
  16     shouldBe('order[7]', '7');
  17     shouldBe('order[8]', '8');
  18     shouldBe('order[9]', '9');
  19     finishJSTest();
  20 }
  21
  22 var order = [];
  23 var observers = [];
  24
  25 function setUpOrdering(num) {
  26     observers.push(new MutationObserver(function(mutations) {
  27         order.push(num);
  28     }));
  29 }
  30
  31 for (var i = 0; i < 10; ++i) {
  32     setUpOrdering(i);
  33 }
  34
  35 var div = document.createElement('div');
  36 observers[3].observe(div, {attributes: true});
  37 observers[2].observe(div, {characterData: true, subtree: true});
  38 observers[1].observe(div, {attributes: true});
  39 observers[7].observe(div, {childList: true});
  40 observers[4].observe(div, {attributes: true});
  41 observers[9].observe(div, {attributes: true});
  42 observers[0].observe(div, {childList: true});
  43 observers[5].observe(div, {attributes: true});
  44 observers[6].observe(div, {characterData: true, subtree: true});
  45 observers[8].observe(div, {attributes: true});
  46 div.setAttribute('foo', 'bar');
  47 div.appendChild(document.createTextNode('hello'));
  48 div.firstChild.textContent = 'goodbye';
  49 setTimeout(finish, 0);
  50 </script>