Sibling invalidation sets

Source/core/input/EventHandler.cpp

Index: Source/core/input/EventHandler.cpp
diff --git a/Source/core/input/EventHandler.cpp b/Source/core/input/EventHandler.cpp
index 6576d80a2cda5b3473038540772187d121609094..c0b83918d6846fb726df0f10f6e43294b4b6c6ba 100644
--- a/Source/core/input/EventHandler.cpp
+++ b/Source/core/input/EventHandler.cpp
@@ -2115,8 +2115,13 @@ bool EventHandler::handleGestureTap(const GestureEventWithHitTestResults& target
 
     bool swallowed = swallowMouseDownEvent | swallowMouseUpEvent | swallowClickEvent;
     if (!swallowed && tappedNode && m_frame->page()) {
-        bool domTreeChanged = preDispatchDomTreeVersion != m_frame->document()->domTreeVersion();
-        bool styleChanged = preDispatchStyleVersion != m_frame->document()->styleVersion();
+        Document* document = m_frame->document();
+        bool domTreeChanged = preDispatchDomTreeVersion != document->domTreeVersion();
+        bool styleChanged = preDispatchStyleVersion != document->styleVersion();
+        if (!styleChanged) {
+            if (Element* documentElement = document->documentElement())
+                styleChanged = documentElement->childNeedsStyleInvalidation();
+        }
 
         IntPoint tappedPositionInViewport = m_frame->page()->frameHost().visualViewport().rootFrameToViewport(tappedPosition);
         m_frame->chromeClient().showUnhandledTapUIIfNeeded(tappedPositionInViewport, tappedNode.get(), domTreeChanged || styleChanged);