Fix #10006: Allow .show() to work on detached elements.

src/effects.js

@@ -38,7 +38,8 @@ jQuery.fn.extend({
 					// Set elements which have been overridden with display: none
 					// in a stylesheet to whatever the default browser style is
 					// for such an element
-					if ( display === "" && jQuery.css(elem, "display") === "none" ) {
+					if ( (display === "" && jQuery.css(elem, "display") === "none") ||
+						!jQuery.contains( elem.ownerDocument.documentElement, elem ) ) {
 						jQuery._data( elem, "olddisplay", defaultDisplay(elem.nodeName) );
 					}
 				}

test/unit/effects.js

@@ -188,6 +188,60 @@ test("show() resolves correct default display #8099", function() {
 
 });
 
+test( "show() resolves correct default display, detached nodes (#10006)", function(){
+	// Tests originally contributed by Orkel in
+	// https://github.com/jquery/jquery/pull/458
+	expect( 11 );
+
+	var div, span;
+
+	div = jQuery("<div class='hidden'>");
+	div.show().appendTo("#qunit-fixture");
+	equal( div.css("display"), "block", "Make sure a detached, pre-hidden( through stylesheets ) div is visible." );
+
+	div = jQuery("<div style='display: none'>");
+	div.show().appendTo("#qunit-fixture");
+	equal( div.css("display"), "block", "Make sure a detached, pre-hidden( through inline style ) div is visible." );
+
+	span = jQuery("<span class='hidden'/>");
+	span.show().appendTo("#qunit-fixture");
+	equal( span.css("display"), "inline", "Make sure a detached, pre-hidden( through stylesheets ) span has default display." );
+
+	span = jQuery("<span style='display: inline'/>");
+	span.show().appendTo("#qunit-fixture");
+	equal( span.css("display"), "inline", "Make sure a detached, pre-hidden( through inline style ) span has default display." );
+
+	div = jQuery("<div><div class='hidden'></div></div>").children("div");
+	div.show().appendTo("#qunit-fixture");
+	equal( div.css("display"), "block", "Make sure a detached, pre-hidden( through stylesheets ) div inside another visible div is visible." );
+
+	div = jQuery("<div><div style='display: none'></div></div>").children("div");
+	div.show().appendTo("#qunit-fixture");
+	equal( div.css("display"), "block", "Make sure a detached, pre-hidden( through inline style ) div inside another visible div is visible." );
+
+	div = jQuery("div.hidden");
+	div.detach().show();
+	equal( div.css("display"), "block", "Make sure a detached( through detach() ), pre-hidden div is visible." );
+	div.remove();
+
+	span = jQuery("<span>");
+	span.appendTo("#qunit-fixture").detach().show().appendTo("#qunit-fixture" );
+	equal( span.css("display"), "inline", "Make sure a detached( through detach() ), pre-hidden span has default display." );
+	span.remove();
+
+	div = jQuery("<div>");
+	div.show().appendTo("#qunit-fixture");
+	ok( !!div.get( 0 ).style.display, "Make sure not hidden div has a inline style." );
+
+	div = jQuery( document.createElement("div") );
+	div.show().appendTo("#qunit-fixture");
+	equal( div.css("display"), "block", "Make sure a pre-created element has default display." );
+
+	div = jQuery("<div style='display: inline'/>");
+	div.show().appendTo("#qunit-fixture");
+	equal( div.css("display"), "inline", "Make sure that element has same display when it was created." );
+});
+
 
 test("animate(Hash, Object, Function)", function() {
 	expect(1);

test/unit/queue.js

@@ -113,6 +113,7 @@ test("callbacks keep their place in the queue", function() {
 
 	div.promise("fx").done(function() {
 		equal(counter, 4, "Deferreds resolved");
+		jQuery.removeData( div[0], "olddisplay", true );
 		start();
 	});
 });