From 90f78b9aab9c99ff3ffcccb1db602670e9707fa0 Mon Sep 17 00:00:00 2001
From: Michał Gołębiowski-Owczarek <m.goleb@gmail.com>
Date: Wed, 8 May 2019 10:12:36 +0200
Subject: Traversing: Fix `contents()` on `<object>`s with children in IE

The original fix didn't account for the fact that in IE `<object>` elements
with no `data` attribute have an object `contentDocument`. The fix leverages
the fact that this special object has a null prototype.

(cherry-picked from ccbd6b93424cbdbf86f07a86c2e55cbab497d7a3)

Closes gh-4390
Ref gh-4384
Ref gh-4385
---
 src/traversing.js | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/traversing.js b/src/traversing.js
index 25843ee8c..afbecc4f4 100644
--- a/src/traversing.js
+++ b/src/traversing.js
@@ -1,5 +1,6 @@
 define( [
 	"./core",
+	"./var/getProto",
 	"./var/indexOf",
 	"./traversing/var/dir",
 	"./traversing/var/siblings",
@@ -9,7 +10,7 @@ define( [
 	"./core/init",
 	"./traversing/findFilter",
 	"./selector"
-], function( jQuery, indexOf, dir, siblings, rneedsContext, nodeName ) {
+], function( jQuery, getProto, indexOf, dir, siblings, rneedsContext, nodeName ) {
 
 "use strict";
 
@@ -145,7 +146,13 @@ jQuery.each( {
 		return siblings( elem.firstChild );
 	},
 	contents: function( elem ) {
-		if ( elem.contentDocument != null ) {
+		if ( elem.contentDocument != null &&
+
+			// Support: IE 11+
+			// <object> elements with no `data` attribute has an object
+			// `contentDocument` with a `null` prototype.
+			getProto( elem.contentDocument ) ) {
+
 			return elem.contentDocument;
 		}
 
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