Navigation transitions: Hide transition elements by setting CSS opacity rather than display.

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index ad901ee9f0a31e05ae7cdc8c6c3551b5b8e5ab1d..192507b09cb5a8146bf9fe4526e22c2a946d291b 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -5641,7 +5641,7 @@ void Document::hideTransitionElements(const AtomicString& cssSelector)
 
         for (unsigned nodeIndex = 0; nodeIndex < nodeListLength; ++nodeIndex) {
             Element* element = elementList->item(nodeIndex);
-            element->setInlineStyleProperty(CSSPropertyDisplay, CSSValueNone);
+            element->setInlineStyleProperty(CSSPropertyOpacity, 0.0, CSSPrimitiveValue::CSS_NUMBER);
         }
     }
 }