Perhaps this does the trick (in IE and Firefox, not in Opera. Don't know about WebKit):
var yourDOCTYPE = "<!DOCTYPE html..."; // your doctype declaration
var printPreview = window.open('about:blank', 'print_preview');
var printDocument = printPreview.document;
printDocument.open();
printDocument.write(yourDOCTYPE+
"<html>"+
document.documentElement.innerHTML+
"</html>");
printDocument.close();
(Note the difference between window.open() and document.open()!)
However, you will lose all custom DOM thingies, like event handlers and so on. Nonetheless, it might work if you just want to copy 'n paste your HTML.
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