<style>
    body { margin: 0; }
    caption div { width: 50px; height: 50px; }
    td { width: 50px; height: 25px; }
    #console { margin: 8px; }
</style>
<table cellpadding="0" cellspacing="0" id="table">
    <tbody>
        <tr>
            <td id="1-1-1"></td>
            <td id="1-1-2"></td>
            <td id="1-1-3"></td>
        </tr>
        <tr>
            <td id="1-2-1"></td>
            <td id="1-2-2"></td>
            <td id="1-2-3"></td>
        </tr>
    </tbody>
    <tbody>
        <tr>
            <td id="2-1-1"></td>
            <td id="2-1-2"></td>
            <td id="2-1-3"></td>
        </tr>
    </tbody>
    <caption id="c">
        <div></div>
    </caption>
</table>
<pre id="console"></pre>
<script>
    if (window.testRunner)
        testRunner.dumpAsText();

    function log(message)
    {
        document.getElementById("console").appendChild(document.createTextNode(message + "\n"));
    }

    function checkElementAtPoint(x, y, id)
    {
        var actualID = document.elementFromPoint(x, y).id;
        if (actualID === id)
            log("PASS: " + id + " at (" + x + ", " + y + ")");
        else
            log("FAIL: " + actualID + " instead of " + id + " at (" + x + ", " + y + ")");
    }

    var style = document.getElementById("table").style;

    checkElementAtPoint(1, 1, "c");
    checkElementAtPoint(1, 51, "1-1-1");
    checkElementAtPoint(51, 51, "1-1-2");
    checkElementAtPoint(101, 51, "1-1-3");
    checkElementAtPoint(1, 76, "1-2-1");
    checkElementAtPoint(51, 76, "1-2-2");
    checkElementAtPoint(101, 76, "1-2-3");
    checkElementAtPoint(1, 101, "2-1-1");
    checkElementAtPoint(51, 101, "2-1-2");
    checkElementAtPoint(101, 101, "2-1-3");

    log("\nTesting vertical-lr:");
    style.webkitWritingMode = "vertical-lr";
    checkElementAtPoint(1, 1, "c");
    checkElementAtPoint(51, 1, "1-1-1");
    checkElementAtPoint(51, 26, "1-1-2");
    checkElementAtPoint(51, 51, "1-1-3");
    checkElementAtPoint(101, 1, "1-2-1");
    checkElementAtPoint(101, 26, "1-2-2");
    checkElementAtPoint(101, 51, "1-2-3");
    checkElementAtPoint(151, 1, "2-1-1");
    checkElementAtPoint(151, 26, "2-1-2");
    checkElementAtPoint(151, 51, "2-1-3");

    log("\nTesting vertical-rl:");
    style.webkitWritingMode = "vertical-rl";
    checkElementAtPoint(151, 1, "c");
    checkElementAtPoint(101, 1, "1-1-1");
    checkElementAtPoint(101, 26, "1-1-2");
    checkElementAtPoint(101, 51, "1-1-3");
    checkElementAtPoint(51, 1, "1-2-1");
    checkElementAtPoint(51, 26, "1-2-2");
    checkElementAtPoint(51, 51, "1-2-3");
    checkElementAtPoint(1, 1, "2-1-1");
    checkElementAtPoint(1, 26, "2-1-2");
    checkElementAtPoint(1, 51, "2-1-3");
</script>