<!DOCTYPE HTML>
<p id="result">Test did not run</p>
<div style="transform: scale(2);">
    <iframe id="target" style="width: 100px; height: 100px; border: none;"></iframe>
</div>
<script>
    if (window.testRunner)
        testRunner.dumpAsText();
    var target = document.getElementById("target");
    document.body.offsetTop;
    document.getElementById("result").innerText = target.contentDocument.body.offsetWidth > 100 ? "FAIL" : "PASS";
</script>