mozilla-release/layout/style/test/test_animations_playbackrate.html

<!DOCTYPE html>
<html>
<head>
  <title>Test for Animation.playbackRate on compositor animations</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <script src="/tests/SimpleTest/paint_listener.js"></script>
  <script type="application/javascript" src="animation_utils.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css">
  <style type="text/css">
    @keyframes anim {
      0% { transform: translate(0px) }
      100% { transform: translate(100px) }
    }
    .target {
      /* The animation target needs geometry in order to qualify for OMTA */
      width: 100px;
      height: 100px;
      background-color: white;
    }
  </style>
</head>
<body>
<div id="display"></div>
<script type="application/javascript">
"use strict";

SimpleTest.waitForExplicitFinish();

runOMTATest(function() {
  runAllAsyncAnimTests().then(SimpleTest.finish);
}, SimpleTest.finish, SpecialPowers);

addAsyncAnimTest(async function() {
  var [ div, cs ] = new_div("animation: anim 10s 1 linear forwards");
  var animation = div.getAnimations()[0];
  animation.playbackRate = 10;

  advance_clock(300);

  await waitForPaints();
  omta_is(div, "transform", { tx: 30 }, RunningOn.Compositor,
          "at 300ms");
  done_div();
});

addAsyncAnimTest(async function() {
  var [ div, cs ] = new_div("animation: anim 10s 1 linear forwards");
  var animation = div.getAnimations()[0];
  advance_clock(300);
  await waitForPaints();

  animation.playbackRate = 0;

  await waitForPaintsFlushed();

  omta_is(div, "transform", { tx: 3 }, RunningOn.MainThread,
          "animation with zero playback rate should stay in the " +
          "same position and be running on the main thread");

  done_div();
});

addAsyncAnimTest(async function() {
  var [ div, cs ] = new_div("animation: anim 10s 1s");
  var animation = div.getAnimations()[0];
  animation.playbackRate = 0.5;

  advance_clock(2000); // 1s * (1 / playbackRate)

  await waitForPaints();
  omta_is(div, "transform", { tx: 0 }, RunningOn.Compositor,
          "animation with positive delay and playbackRate > 1 should " +
          "start from the initial position at the beginning of the " +
          "active duration");
  done_div();
});

addAsyncAnimTest(async function() {
  var [ div, cs ] = new_div("animation: anim 10s 1s");
  var animation = div.getAnimations()[0];
  animation.playbackRate = 2.0;

  advance_clock(500); // 1s * (1 / playbackRate)

  await waitForPaints();
  omta_is(div, "transform", { tx: 0 }, RunningOn.Compositor,
          "animation with positive delay and playbackRate < 1 should " +
          "start from the initial position at the beginning of the " +
          "active duration");
  done_div();
});
</script>
</body>
</html>