docs: function isEmptyBlockNeedFiller( block ) {
  
  			// DO NOT fill empty editable in IE<11.
  			if ( !isOutput && !CKEDITOR.env.needsBrFiller && block.type == CKEDITOR.NODE_DOCUMENT_FRAGMENT )
  				return false;
  
  			// 1. For IE version >=8,  empty blocks are displayed correctly themself in wysiwiyg;
  			// 2. For the rest, at least table cell and list item need no filler space. (#6248)
  			if ( !isOutput && !CKEDITOR.env.needsBrFiller &&
  				( document.documentMode > 7 ||
  					block.name in CKEDITOR.dtd.tr ||
  					block.name in CKEDITOR.dtd.$listItem ) ) {
  				return false;
  			}
  
  			var last = getLast( block );
  			return !last || block.name == 'form' && last.name == 'input' ;
  		}