<!DOCTYPE html>
<script>
if (window.testRunner)
    testRunner.dumpAsText();

onload = function() {
    var iframe = document.createElement('iframe');
    document.getElementById("div").appendChild(iframe);
    var iframeDoc = iframe.contentWindow.document;
    var style = iframeDoc.createProcessingInstruction('xml-stylesheet', 'href="null.css" type="text/css"');
    iframeDoc.insertBefore(style, iframeDoc.firstChild);
    style.deleteData(0, 0);
    style.deleteData(10, 1);
}
</script>
<div id="div">PASS</div>