code: function(node) {
  		return (
  			F2.isNativeDOMNode(node) &&
  			!_hasNonTextChildNodes(node) &&
  			!!node.getAttribute('data-f2-appid') &&
  			!!node.getAttribute('data-f2-manifesturl')
  		);
  	}
docs: Checks if an element is a placeholder element
  @method _isPlaceholderElement
  @private
  @param {Element} node The DOM element to check
  @return {bool} True if the element is a placeholder