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<!DOCTYPE html>
<html>
<head>
  <style>
    #container {
      width: 200px;
      height: 200px;
      overflow: scroll;
    }

    #content {
      width: 7500px;
      height: 7500px;
      background-color: blue;
    }
  </style>
  <script src="../../resources/js-test.js"></script>
  <script type="text/javascript">
    jsTestIsAsync = true;
    description("This test checks that a smooth scroll finishes even when composited scrolling " +
                "is lost during the animation.");

    function startSmoothScroll() {
        var scrollToOptions = {behavior: "smooth", top: 6000};
        document.getElementById("container").scrollTo(scrollToOptions);
        window.requestAnimationFrame(preventCompositedScrolling);
    }

    function preventCompositedScrolling() {
        document.getElementById("container").style.borderRadius = "4px";
        window.requestAnimationFrame(waitForSmoothScrollEnd);
    }

    function waitForSmoothScrollEnd() {
        if (document.getElementById("container").scrollTop == 6000) {
            testPassed("Scroll destination reached.");
            finishJSTest();
        } else {
            window.requestAnimationFrame(waitForSmoothScrollEnd);
        }
    }

    window.onload = function() {
        if (window.internals) {
            window.internals.settings.setPreferCompositingToLCDTextEnabled(true);
        }

        window.requestAnimationFrame(startSmoothScroll);
    }
  </script>
</head>

<body>
  <div id="container">
    <div id="content"></div>
  </div>
</body>
</html>