code: function addStyleSheet(ownerDocument, cssText) {
      var p = ownerDocument.createElement('p'),
          parent = ownerDocument.getElementsByTagName('head')[0] || ownerDocument.documentElement;
  
      p.innerHTML = 'x<style>' + cssText + '</style>';
      return parent.insertBefore(p.lastChild, parent.firstChild);
    }
docs: /*-------------------------------------------------------------------------- 
  Creates a style sheet with the given CSS text and adds it to the document.
  @private
  @param {Document} ownerDocument The document.
  @param {String} cssText The CSS text.
  @returns {StyleSheet} The style element.