I have noticed that bootstrap uses:
PHP Code:
<!DOCTYPE html>
<!--[if 
IE 8]> <html lang="en" class="ie8"> <![endif]-->
<!--[if 
IE 9]> <html lang="en" class="ie9"> <![endif]-->
<!--[if !
IE]><!--> <html lang="en"> <!--<![endif]-->
<
head
1. What will happen if there is other than en language like Russian or many languages. Which lang should be used in unicode?

2. Can we use just <html lang="en"> as it is used modernizr.js