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document.open(mimetype,replace)
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<html>
<head>
<script type="text/javascript">
function createNewDoc()
{
var newDoc=document.open("text/html","replace")
;
var txt="<html><body>Learning about the DOM is FUN!</body></html>";
newDoc.write(txt);
newDoc.close();
}
</script>
</head>
<body>
<input type="button" value="Write to a new document"
onclick="createNewDoc()">
</body>
</html>