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Remove style from DOM when placed in iframe

hankknight asked
Last Modified: 2012-06-21
I use the following code to dynamically place content in an iframe.  

The problem is that if there are bad syles in the code, the bad styles stay even after the content is placed in iframe.

The problem only seems to be in Firefox.

If you test my code in Firefox you will see the problem.

Thanks for the help!
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<h1>Dynamically Place Content of div in Iframe</h1>
<div id="postentry">
<style type="text/css">
html, body { background: red;}
<body><h1>>Bad Code2<h1>tstt<h3>Only the iframe should be red<h3>
<script type="text/javascript">
	var messageContent = document.getElementById('postentry');
	if (messageContent) 
		var htmlContent = messageContent.innerHTML;
		messageContent.innerHTML = '';
		var iFrame = document.createElement("iframe");
		iFrame.marginWidth = "0";
		iFrame.frameBorder = "1";
		iFrame.height = "500px";
		iFrame.width = "100%";
		iFrame.style.zIndex = "999";
		var htmlPost = document.getElementById('postentry');
		if (htmlPost) 
			var displayFrame = this.document.getElementById("ifhsf2gxvzw54vx");
			var doc = displayFrame.contentDocument;
			if (doc == undefined || doc == null)
			    doc = displayFrame.contentWindow.document;
			doc.body.leftMargin = "0px";
			doc.body.rightMargin = "0px";
			doc.body.topMargin = "0px";
			doc.body.bottomMargin = "0px";

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