Say
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
</head>
<body>
<div>code here</div>
<html><head>...</head><body>...</body></html>
</body>
</html>
I have tested it in Firefox and it works. Is this right?
Say <html xmlns=http://www.w3.org/1999/xhtml> <head> </head> <body> <div>code here</div> <html><head>…</head><body>…</body></html> </body> </html> I have tested
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No, it is invalid. Firefox is just being lenient and making the best out of what is a broken structure.
If in doubt, run it through the w3c validator: