Identify the primary language of each document to ensure that clients automatically retrieve web pages in their preferred language. Language can be specified either through http headers or html markup (i.e. 'html lang="en"').
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd"> <html> <head> <title>aert1.0/4.3.1 - The HTML element does not contain a lang attribute</title> </head> <body> </body> </html>
W3C WAI: http://www.w3.org/WAI//
HTML Techniques for WAI 1.0: http://www.w3.org/TR/WCAG10-HTML-TECHS/