[selectors4] Implement :focus-within pseudo-class

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

Index: third_party/WebKit/Source/core/css/resolver/SharedStyleFinderTest.cpp
diff --git a/third_party/WebKit/Source/core/css/resolver/SharedStyleFinderTest.cpp b/third_party/WebKit/Source/core/css/resolver/SharedStyleFinderTest.cpp
index 94a93d98d388c656c2e27f8092729c2dd46bf1c8..bc00bec9e17cb5b108490dda808261e3cee54e31 100644
--- a/third_party/WebKit/Source/core/css/resolver/SharedStyleFinderTest.cpp
+++ b/third_party/WebKit/Source/core/css/resolver/SharedStyleFinderTest.cpp
@@ -157,6 +157,25 @@ TEST_F(SharedStyleFinderTest, AttributeAffectedByFocus) {
   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>");