<!DOCTYPE html>

<html>
<head>
    <style>
        .box {
            width: 100px;
            height: 100px;
            margin: 20px;
            background-color: blue;
            position: relative;
            z-index: 0; /* Avoid changes in stacking triggering compositing */
        }
        
        .removal {
            will-change: transform;
        }

        body.changed .addition {
            will-change: transform;
        }

        body.changed .removal {
            will-change: auto;
        }
    </style>
    <script>
        if (window.testRunner) {
            testRunner.dumpAsText();
            testRunner.waitUntilDone();
        }

        function doTest()
        {
            window.setTimeout(function() {
                document.body.classList.add('changed');
                if (window.testRunner) {
                    document.getElementById('layers').innerText = window.internals.layerTreeAsText(document);
                    testRunner.notifyDone();
                }
            }, 0)
        }
        window.addEventListener('load', doTest, false);
    </script>
</head>
<body>

<div class="addition box"></div>
<div class="removal box"></div>
<pre id="layers"></pre>
</body>
</html>