[selectors4] Implement :focus-within pseudo-class

third_party/WebKit/Source/core/css/resolver/SharedStyleFinderTest.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/css/resolver/SharedStyleFinder.h"
 
 #include <memory>
 #include "bindings/core/v8/V8Binding.h"
 #include "core/css/RuleFeature.h"
 #include "core/css/RuleSet.h"
@@ skipping 139 matching lines @@
   ASSERT_TRUE(a);
   ASSERT_TRUE(b);
 
   EXPECT_FALSE(a->IsFocused());
   EXPECT_FALSE(b->IsFocused());
 
   EXPECT_TRUE(MatchesUncommonAttributeRuleSet(*a));
   EXPECT_FALSE(MatchesUncommonAttributeRuleSet(*b));
 }
 
+TEST_F(SharedStyleFinderTest, AttributeAffectedByFocusWithin) {
+  SetBodyContent("<div id=a attr></div><div id=b></div>");
+
+  AddSelector("[attr]:focus-within");
+  FinishAddingSelectors();
+
+  Element* a = GetDocument().GetElementById("a");
+  Element* b = GetDocument().GetElementById("b");
+
+  ASSERT_TRUE(a);
+  ASSERT_TRUE(b);
+
+  EXPECT_FALSE(a->HasFocusWithin());
+  EXPECT_FALSE(b->HasFocusWithin());
+
+  EXPECT_TRUE(MatchesUncommonAttributeRuleSet(*a));
+  EXPECT_FALSE(MatchesUncommonAttributeRuleSet(*b));
+}
+
 TEST_F(SharedStyleFinderTest, AttributeAffectedByActive) {
   SetBodyContent("<div id=a attr></div><div id=b></div>");
 
   AddSelector("[attr]:active");
   FinishAddingSelectors();
 
   Element* a = GetDocument().GetElementById("a");
   Element* b = GetDocument().GetElementById("b");
 
   ASSERT_TRUE(a);
@@ skipping 39 matching lines @@
   Element* b = GetDocument().GetElementById("b");
 
   EXPECT_TRUE(a->AssignedSlot());
   EXPECT_TRUE(b->AssignedSlot());
 
   EXPECT_FALSE(MatchesUncommonAttributeRuleSet(*a));
   EXPECT_TRUE(MatchesUncommonAttributeRuleSet(*b));
 }
 
 }  // namespace blink