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You should always include the lang attribute inside the <html> tag, to declare the language of the Web page. This is meant to assist search engines and browsers: <html lang="en">... </html> In XHTML, the language is declared inside the <html> tag as follows:
Formula
< html xmlns ="http://www.w3.org/1999/xhtml" lang ="en" xml:lang ="en">...</html>
Formula
ISO 639 - 1 Language Codes
ISO 639 - 1 defines abbreviations for languages:Reference for Country Codes.
Bengali (Bangla) bn