Core: Remove ancestor visibility requirement from :focusable selector

Author: westonruter

tests/unit/core/selector.js

@@ -127,14 +127,14 @@ test( "focusable - hidden styles", function() {
 	isNotFocusable( "#displayNoneAncestor-input", "input, display: none parent" );
 	isNotFocusable( "#displayNoneAncestor-span", "span with tabindex, display: none parent" );
 
-	isNotFocusable( "#visibilityHiddenAncestor-input", "input, visibility: hidden parent" );
-	isNotFocusable( "#visibilityHiddenAncestor-span", "span with tabindex, visibility: hidden parent" );
+	isFocusable( "#visibilityHiddenAncestor-input", "input, visibility: hidden parent" );
+	isFocusable( "#visibilityHiddenAncestor-span", "span with tabindex, visibility: hidden parent" );
 
 	isNotFocusable( "#displayNone-input", "input, display: none" );
-	isNotFocusable( "#visibilityHidden-input", "input, visibility: hidden" );
+	isFocusable( "#visibilityHidden-input", "input, visibility: hidden" );
 
 	isNotFocusable( "#displayNone-span", "span with tabindex, display: none" );
-	isNotFocusable( "#visibilityHidden-span", "span with tabindex, visibility: hidden" );
+	isFocusable( "#visibilityHidden-span", "span with tabindex, visibility: hidden" );
 });
 
 test( "focusable - natively focusable with various tabindex", function() {
@@ -212,14 +212,14 @@ test( "tabbable - hidden styles", function() {
 	isNotTabbable( "#displayNoneAncestor-input", "input, display: none parent" );
 	isNotTabbable( "#displayNoneAncestor-span", "span with tabindex, display: none parent" );
 
-	isNotTabbable( "#visibilityHiddenAncestor-input", "input, visibility: hidden parent" );
-	isNotTabbable( "#visibilityHiddenAncestor-span", "span with tabindex, visibility: hidden parent" );
+	isTabbable( "#visibilityHiddenAncestor-input", "input, visibility: hidden parent" );
+	isTabbable( "#visibilityHiddenAncestor-span", "span with tabindex, visibility: hidden parent" );
 
 	isNotTabbable( "#displayNone-input", "input, display: none" );
-	isNotTabbable( "#visibilityHidden-input", "input, visibility: hidden" );
+	isTabbable( "#visibilityHidden-input", "input, visibility: hidden" );
 
 	isNotTabbable( "#displayNone-span", "span with tabindex, display: none" );
-	isNotTabbable( "#visibilityHidden-span", "span with tabindex, visibility: hidden" );
+	isTabbable( "#visibilityHidden-span", "span with tabindex, visibility: hidden" );
 });
 
 test( "tabbable -  natively tabbable with various tabindex", function() {

ui/core.js

@@ -189,23 +189,14 @@ function focusable( element, hasTabindex ) {
 		if ( !element.href || !mapName || map.nodeName.toLowerCase() !== "map" ) {
 			return false;
 		}
-		img = $( "img[usemap='#" + mapName + "']" )[ 0 ];
-		return !!img && visible( img );
+		img = $( "img[usemap='#" + mapName + "']" );
+		return img.length && img.is( ":visible" );
 	}
 	return ( /^(input|select|textarea|button|object)$/.test( nodeName ) ?
 		!element.disabled :
 		"a" === nodeName ?
 			element.href || hasTabindex :
-			hasTabindex ) &&
-		// the element and all of its ancestors must be visible
-		visible( element );
-}
-
-function visible( element ) {
-	return $.expr.filters.visible( element ) &&
-		!$( element ).parents().addBack().filter( function() {
-			return $.css( this, "visibility" ) === "hidden";
-		} ).length;
+			hasTabindex ) && $( element ).is( ":visible" );
 }
 
 $.extend( $.expr[ ":" ], {