bug.html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
        "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <title>WebKit/Opera Range bug</title>
    <script type="text/javascript">
        window.onload = function() {
            var iframe = document.createElement("iframe");
            document.body.appendChild(iframe);
            var doc = iframe.contentDocument;
            doc.write("<html><head><body>stuff</body></html>");
            doc.close();
            var r = document.createRange();
            r.selectNodeContents(document.getElementById("test"));

            // Move range start to the iframe document. According to the DOM
            // Range spec, this should collapse the Range to the new boundary
            // but in WebKit we get a WRONG_DOCUMENT_ERR
            try {
                r.setStart(doc.body, 0);
                alert(r.startContainer.firstChild.data); // Should be "stuff"
            } catch (ex) {
                alert("Error: "  + ex);
            }
        };
    </script>
</head>
<body>
    <div id="test">Some content</div>
</body>
</html>