Revert "Fix #14180. Allow cross-frame use of focusin/out. Close gh-1369."

This reverts commit bba8366a.

Because cross-frame focus sucks.

src/event.js

@@ -892,29 +892,22 @@ if ( !support.changeBubbles ) {
 if ( !support.focusinBubbles ) {
 	jQuery.each({ focus: "focusin", blur: "focusout" }, function( orig, fix ) {
 
-		// Attach a single capturing handler on the document while someone wants focusin/focusout
-		var handler = function( event ) {
+		// Attach a single capturing handler while someone wants focusin/focusout
+		var attaches = 0,
+			handler = function( event ) {
 				jQuery.event.simulate( fix, event.target, jQuery.event.fix( event ), true );
 			};
 
 		jQuery.event.special[ fix ] = {
 			setup: function() {
-				var doc = this.ownerDocument,
-					attaches = jQuery._data( doc, "focusCount" );
-
-				if ( !attaches ) {
-					doc.addEventListener( orig, handler, true );
+				if ( attaches++ === 0 ) {
+					document.addEventListener( orig, handler, true );
 				}
-				jQuery._data( doc, "focusCount", ( attaches || 0 ) + 1 );
 			},
 			teardown: function() {
-				var doc = this.ownerDocument,
-					attaches = jQuery._data( doc, "focusCount" ) - 1;
-
-				if ( !attaches ) {
-					doc.removeEventListener( orig, handler, true );
+				if ( --attaches === 0 ) {
+					document.removeEventListener( orig, handler, true );
 				}
-				jQuery._data( doc, "focusCount", attaches );
 			}
 		};
 	});

test/data/event/focusinCrossFrame.html

-<!doctype html>
-<html>
-<head>
-	<meta http-equiv="Content-type" content="text/html; charset=utf-8">
-	<title>focusin event cross-frame (#14180)</title>
-
-	<script src="../../jquery.js"></script>
-</head>
-<body>
-	<input type="text" id="frame-input" />
-	<script>
-		// Call parent when this frame is fully loaded, it will mess with #frame-input
-		jQuery( window ).one( "load", function() {
-			window.parent.iframeCallback( document );
-		});
-	</script>
-</body>
-</html>

test/unit/event.js

@@ -2507,33 +2507,6 @@ test("fixHooks extensions", function() {
 	jQuery.event.fixHooks.click = saved;
 });
 
-testIframeWithCallback( "focusin from an iframe", "event/focusinCrossFrame.html", function( frameDoc ) {
-	expect(1);
-
-	var input = jQuery( frameDoc ).find( "#frame-input" );
-
-	// Create a focusin handler on the parent; shouldn't affect the iframe's fate
-	jQuery ( "body" ).on( "focusin.iframeTest", function() {
-		ok( false, "fired a focusin event in the parent document" );
-	});
-
-	input.on( "focusin", function() {
-		ok( true, "fired a focusin event in the iframe" );
-	});
-
-	// Avoid a native event; Chrome can't force focus to another frame
-	input.trigger( "focusin" );
-
-	// Must manually remove handler to avoid leaks in our data store
-	input.remove();
-
-	// Be sure it was removed; nothing should happen
-	input.trigger( "focusin" );
-
-	// Remove body handler manually since it's outside the fixture
-	jQuery( "body" ).off( "focusin.iframeTest" );
-});
-
 testIframeWithCallback( "jQuery.ready promise", "event/promiseReady.html", function( isOk ) {
 	expect(1);
 	ok( isOk, "$.when( $.ready ) works" );