From 52f04699c0ede7eb75f2521a2866f7059e1a294e Mon Sep 17 00:00:00 2001
From: wolfbeast <mcwerewolf@gmail.com>
Date: Sat, 22 Dec 2018 07:33:31 +0100
Subject: [PATCH] Use targetFrame->GetRectRelativeToSelf() as the initial
 intersection rect.

Tag #249.
---
 dom/base/DOMIntersectionObserver.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dom/base/DOMIntersectionObserver.cpp b/dom/base/DOMIntersectionObserver.cpp
index 0834bc05c9..f0be34ec0b 100644
--- a/dom/base/DOMIntersectionObserver.cpp
+++ b/dom/base/DOMIntersectionObserver.cpp
@@ -344,7 +344,7 @@ DOMIntersectionObserver::Update(nsIDocument* aDocument, DOMHighResTimeStamp time
         nsLayoutUtils::GetContainingBlockForClientRect(targetFrame),
         nsLayoutUtils::RECTS_ACCOUNT_FOR_TRANSFORMS
       );
-      intersectionRect = Some(targetFrame->GetVisualOverflowRect());
+      intersectionRect = Some(targetFrame->GetRectRelativeToSelf());
 
       nsIFrame* containerFrame = nsLayoutUtils::GetCrossDocParentFrame(targetFrame);
       while (containerFrame && containerFrame != rootFrame) {