chromium/third_party/blink/web_tests/compositing/transitions/scale-transition-no-start.html

<!DOCTYPE>

<html>
<head>
  <title>Scale without initial value.</title>
  <style type="text/css" media="screen">
    .box {
      height: 200px;
      width: 200px;
      border: 1px solid #EEE;
    }
    
    .indicator {
      position: absolute;
      height: 150px;
      width: 150px;
      margin: 25px;
      -webkit-box-sizing: border-box;
      border: 1px solid black;
    }
    
    .inner {
      height: 100px;
      width: 100px;
      margin: 50px;
      background-color: green;
      opacity: 0.7;
      -webkit-transition: -webkit-transform 1s linear;
    }

    .box.final #inner1 {
      transform: scale(2);
    }

    .box.final #inner2 {
      transform: scaleX(2);
    }
  </style>
  
  <script src="../../animations/resources/animation-test-helpers.js" type="text/javascript" charset="utf-8"></script>
  <script type="text/javascript" charset="utf-8">

    const expectedValues = [
      // [time, element-id, property, expected-value, tolerance]
      [0.5, 'inner1', '-webkit-transform.0', 1.5, 0.1],
      [0.5, 'inner2', '-webkit-transform.0', 1.5, 0.1],
    ];

    function setupTest()
    {
      var boxes = document.querySelectorAll('.box');
      boxes[0].className = 'box final';
      boxes[1].className = 'box final';
    }
    runTransitionTest(expectedValues, setupTest, undefined, true /* pixel test */);
  </script>
</head>
<body>
  <p>In the pixel result, the green boxes should be coincident with the black outline.</p>
  <div class="box" id="box1">
    <div class="indicator"></div>
    <div class="inner" id="inner1"></div>
  </div>

  <div class="box" id="box2">
    <div class="indicator"></div>
    <div class="inner" id="inner2"></div>
  </div>

  <div id="result"></div>
</body>
</html>