How to use a separate file for IE responsive.css for version 10/11 in Drupal I am setting responsive design for only IE (Internet Explorer) in Drupal 7.
here is my code its for work lower then IE 10 not for IE 10/11

function bootstrap_preprocess_html(&amp;$variables){
  drupal_add_css(path_to_theme() . '/css/ie_10.css', 
    array('group' =&gt; CSS_THEME, 
        'browsers' =&gt; array('IE' =&gt; 'lte IE 10', 
            '!IE' =&gt; FALSE),
                 'preprocess' =&gt; FALSE)
);
}
I suggest customising a pre-built theme template that has already taken care of that such as Zen or Omega.