<!DOCTYPE html>

<html>
<head>
  <style>
    body {
      margin: 0;
    }
    
    #target {
      position: relative;
      top: 100px;
      left: 100px;
      width: 200px;
      height: 200px;
      background-color: red;
      -webkit-transition-property: left;
      -webkit-transition-duration: 0s;
      -webkit-transition-delay: 0.5s;
    }
   </style>
   <script>


    function numberOfActiveAnimations()
    {
        return document.getAnimations().filter(animation => {
            const playState = animation.playState;
            return playState == "running" || playState == "paused";
        }).length;
    }

    function sample0() {
      var expected = 1;
      var current = numberOfActiveAnimations();
      if (current == expected)
        document.getElementById('result0').innerHTML = "Number of active animations before transition is (" + current + ") as expected";
      else
        document.getElementById('result0').innerHTML = "Number of active animations before transition is (" + current + ") but was expecting (" + expected + ")";
    }
    
    function sample1() {
      var expected = 0;
      var current = numberOfActiveAnimations();
      if (current == expected)
        document.getElementById('result1').innerHTML = "Number of active animations after transition is (" + current + ") as expected";
      else
        document.getElementById('result1').innerHTML = "Number of active animations after transition is (" + current + ") but was expecting (" + expected + ")";
      
      testRunner.notifyDone();
    }
    
    function runTest() {
      window.setTimeout(sample0, 250);
      // Note that since 0-delay transitions do not disptach transitionEnd events
      // we have to use a timeout here.
      window.setTimeout(sample1, 750);
    }
    
    function startTest() {
      if (window.testRunner) {
        testRunner.dumpAsText();
        testRunner.waitUntilDone();
        
        var target = document.getElementById('target');
        target.style.left = '200px';
        runTest();
      }
    }
   </script>
</head>
<body onload="startTest()">
  <h1>Test for DRT numberOfActiveAnimations() API</h1>

  <div id="target">
  </div>
  
  <div id="result0">
  </div>
  
  <div id="result1">
  </div>

</body>
</html>