Proper way to add quotation marks to quotes

/* for two levels of nested quotations */
q {quotes: '“' '”' '‘' '’';}
 /* extra content definitions for pre-2011 WebKit */
q:before {content: '“'; content: open-quote;}
q:after {content: '”'; content: close-quote;}
q q:before {content: '‘'; content: open-quote;}
q q:after {content: '’'; content: close-quote;}
  /* q in blockquote */
blockquote q:before {content: '‘'; content: open-quote;}
blockquote q:after {content: '’'; content: close-quote;}
blockquote q q:before {content: '“'; content: open-quote;}
blockquote q q:after {content: '”'; content: close-quote;}
  /* blockquote hanging opening quote */
blockquote:before {display: block; height: 0; content: "“"; margin-left: -.95em; font: italic 400%/1 Cochin,Georgia,"Times New Roman",serif; color: #999;}