<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Verify that animations properly start</title>
    <style>
      #container {
        position: absolute;
        left: 0;
        top: 3em;
      }
      #squareLinear, #squareSteps, #squareNonAccelerated  {
        width: 100px;
        height: 100px;
        background: lightblue;
        position: absolute;
      }
      /* Avoid animation-fill-mode, to make sure that the move is done by the animation code. */
      #squareLinear {
        top: 0px;
        animation: moveByTransform 10s linear;
      }
      #squareSteps {
        top: 150px;
        animation: moveByTransform 10s steps(1000);
      }
      #squareNonAccelerated  {
        top: 300px;
        animation: moveByLeft 10s steps(100);
      }
      @keyframes moveByTransform
      {
        100% {
          transform: translate(5000px);
        }
      }
      @keyframes moveByLeft
      {
        0% {
          left: 0px;
        }
        100% {
          left: 5000px;
        }
      }
      #coveringRect {
        background: blue;
        position: absolute;
        top: -10px;
        left: 90px;
        width: 5000px;
        height: 500px;
      }
    </style>
    <script>
      function runTest() {
        if (!window.testRunner)
          return;
        // We wait a bit after the squares are moved behind the blue rectangle. For discontinuous
        // transforms we have 5000px / 100 steps = 5px/step. Hence this happens after 20 steps i.e.
        // 20/100*10s = 200ms.
        testRunner.waitUntilDone();
        setTimeout(() => { testRunner.notifyDone(); }, 300);
      }
    </script>
  </head>
  <body onload="runTest()">
    <p>This test passes if green squares are moved behind the blue rectangle.</p>
    <div id="container">
      <div id="squareLinear"><tt>transform</tt> (linear)</div>
      <div id="squareSteps"><tt>transform</tt> (steps)</div>
      <div id="squareNonAccelerated"><tt>left</tt> (steps)</div>
      <div id="coveringRect"></div>
    </div>
  </body>
</html>