docs: function( doc, withAppend ) {
  			var els = 'abbr,article,aside,audio,bdi,canvas,data,datalist,details,figcaption,figure,footer,header,hgroup,mark,meter,nav,output,progress,section,summary,time,video'.split( ',' ),
  				i = els.length,
  				el;
  
  			while ( i-- ) {
  				el = doc.createElement( els[ i ] );
  				if ( withAppend )
  					doc.appendChild( el );
  			}
  		}