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<form method="post" action="xxxxxxxxxx.xxx" target="iframeName">
<input type="submit">
</form>
<iframe src="about:blank" id="iframeId" name="iframeName" style="display: none;"></iframe>
<script type="text/javascript">
document.getElementById("iframeId").onload=function(){
var win = this.contentWindow;
if (win.location.href=="about:blank") return;
alert(win.document.documentElement.outerHTML);
}
</script>