documentCharsetInfo Obsolete since Gecko 12.0nsIDocumentCharsetInfonsIDocumentCharsetInfo object for the document which is used to handle which character set should be used to display the document. The properties of the nsIDocumentCharsetInfo object were merged into the docshell in Gecko 12.0 (Firefox 12.0 / Thunderbird 12.0 / SeaMonkey 2.9).