<!DOCTYPE html> <!-- webkit-test-runner [ internal:AsyncOverflowScrollingEnabled=true ] -->
<html>
<head>
    <title>Check that compositing traverses deeply enough to re-parent scrolling tree nodes</title>
    <script>
        if (window.testRunner) {
            testRunner.dumpAsText();
            testRunner.waitUntilDone();
        }

        function doTest()
        {
            requestAnimationFrame(() => {
                document.getElementById('main').classList.add('changed');
                if (window.internals)
                    document.getElementById('scrollingTree').innerText = window.internals.scrollingStateTreeAsText() + "\n";

                if (window.testRunner)
                    testRunner.notifyDone();
            });
        }

        window.addEventListener('load', doTest, false);
    </script>
    <style>
        .scroller {
            position: relative;
            z-index: 0; /* We want z-order nesting */
            background-color: silver;
            border: 1px solid black;
            padding: 20px;
            margin: 20px;
            width: 400px;
            height: 300px;
            overflow: scroll;
        }
        
        #main {
            height: 500px;
        }
        
        #main.changed {
            overflow: hidden;
        }
        
        .scrolling-content {
            height: 1000px;
        }

        .intermediate {
            position: relative;
            z-index: 0;
        }
        
        .composited {
            transform: translateZ(1px);
            background-color: orange;
        }
    </style>
</head>
<body>
    <div class="scroller" id="main">
        <div class="scrolling-content">
            Scrolling content
                <div class="intermediate composited">
                    Intermediate
                    <div class="inner scroller">
                        <div class="scrolling-content">
                        Inner scrolling content
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
    <pre id="scrollingTree"></pre>
</body>
</html>