tor-browser

The Tor Browser
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two-animations-attach-to-same-scroll-timeline-cancel-one.html (2180B)

      1 <html class="reftest-wait">
      2 <title>Scroll timeline shared by two animation, one gets cancelled</title>
      3 <link rel="help" href="https://drafts.csswg.org/scroll-animations/">
      4 <meta name="assert" content="Cancelling animations should not affect other
      5                   animation that is attached to the same timeline.">
      6 <link rel="match" href="animation-ref.html">
      7 
      8 <script src="/web-animations/testcommon.js"></script>
      9 <script src="/common/reftest-wait.js"></script>
     10 
     11 <style>
     12  #box {
     13    width: 100px;
     14    height: 100px;
     15    background-color: green;
     16  }
     17 
     18  #covered {
     19    width: 100px;
     20    height: 100px;
     21    background-color: red;
     22  }
     23 
     24  #scroller {
     25    overflow: hidden;
     26    height: 100px;
     27    width: 100px;
     28    will-change: transform; /* force compositing */
     29  }
     30 
     31  #contents {
     32    height: 1000px;
     33    width: 100%;
     34  }
     35 </style>
     36 
     37 <div id="box"></div>
     38 <div id="covered"></div>
     39 <div id="scroller">
     40  <div id="contents"><p>Scrolling Contents</p></div>
     41 </div>
     42 
     43 <script>
     44  const box = document.getElementById('box');
     45  const effect = new KeyframeEffect(box,
     46    [
     47    { transform: 'translateY(0)', opacity: 1},
     48    { transform: 'translateY(200px)', opacity: 0}
     49    ], {
     50      duration: 1000,
     51    }
     52  );
     53  const temporary_effect = new KeyframeEffect(box,
     54    [
     55    { transform: 'translateX(0)'},
     56    { transform: 'translateX(200px)'}
     57    ], {
     58      duration: 1000,
     59    }
     60  );
     61 
     62  const scroller = document.getElementById('scroller');
     63  const timeline = new ScrollTimeline(
     64      { source: scroller, orientation: 'block' });
     65  const animation = new Animation(effect, timeline);
     66  const temporary_animation = new Animation(temporary_effect, timeline);
     67  animation.play();
     68  temporary_animation.play();
     69 
     70  Promise.all([animation.ready, temporary_animation.ready]).then(() => {
     71    temporary_animation.cancel();
     72    temporary_animation.ready.then(() => {
     73      waitForAnimationFrames(2).then(_ => {
     74        // Move the scroller to the halfway point.
     75        const maxScroll = scroller.scrollHeight - scroller.clientHeight;
     76        scroller.scrollTop = 0.5 * maxScroll;
     77 
     78        waitForAnimationFrames(2).then(_ => {
     79          takeScreenshot();
     80        });
     81      });
     82    });
     83  });
     84 </script>