<body style="font: 20px ahem; margin: 0;">
    <div id="result" style="outline: solid blue; height: 100px; width: 100px; -webkit-transform: translatez(0)"></div>
    <div style="height: 900px"></div>
    <div style="height: 100px;">target</div>
    <div style="height: 1000px;"></div>
    <script>
        if (window.testRunner && window.internals) {
            testRunner.dumpAsText();
            window.internals.setPageScaleFactor(2, 0, 0);
        }

        document.execCommand("FindString", false, "target");
        document.getElementById("result").innerText = document.body.scrollTop === 864 ? "PASS" : "FAIL";
    </script>
</body>