define( [
  	"../../core",
  	"../../selector"
  
  	// css is assumed
  ], function( jQuery ) {
  	"use strict";
  
  	// isHiddenWithinTree reports if an element has a non-"none" display style (inline and/or
  	// through the CSS cascade), which is useful in deciding whether or not to make it visible.
  	// It differs from the :hidden selector (jQuery.expr.pseudos.hidden) in two important ways:
  	// * A hidden ancestor does not force an element to be classified as hidden.
  	// * Being disconnected from the document does not force an element to be classified as hidden.
  	// These differences improve the behavior of .toggle() et al. when applied to elements that are
  	// detached or contained within hidden ancestors (gh-2404, gh-2863).
  	return function( elem, el ) {
  
  		// isHiddenWithinTree might be called from jQuery#filter function;
  		// in that case, element will be second argument
  		elem = el || elem;
  
  		// Inline style trumps all
  		return elem.style.display === "none" ||
  			elem.style.display === "" &&
  
  			// Otherwise, check computed style
  			// Support: Firefox <=43 - 45
  			// Disconnected elements can have computed display: none, so first confirm that elem is
  			// in the document.
  			jQuery.contains( elem.ownerDocument, elem ) &&
  
  			jQuery.css( elem, "display" ) === "none";
  	};
  } );