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-rw-r--r--dom/base/DOMIntersectionObserver.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/dom/base/DOMIntersectionObserver.cpp b/dom/base/DOMIntersectionObserver.cpp
index 389b93071..70b5534ba 100644
--- a/dom/base/DOMIntersectionObserver.cpp
+++ b/dom/base/DOMIntersectionObserver.cpp
@@ -339,6 +339,7 @@ DOMIntersectionObserver::Update(nsIDocument* aDocument, DOMHighResTimeStamp time
for (size_t i = 0; i < mObservationTargets.Length(); ++i) {
Element* target = mObservationTargets.ElementAt(i);
nsIFrame* targetFrame = target->GetPrimaryFrame();
+ nsIFrame* originalTargetFrame = targetFrame;
nsRect targetRect;
Maybe<nsRect> intersectionRect;
bool isSameDoc = root && root->GetComposedDoc() == target->GetComposedDoc();
@@ -424,7 +425,7 @@ DOMIntersectionObserver::Update(nsIDocument* aDocument, DOMHighResTimeStamp time
);
if (intersectionRect.isSome() && !isSameDoc) {
nsRect rect = intersectionRect.value();
- nsPresContext* presContext = targetFrame->PresContext();
+ nsPresContext* presContext = originalTargetFrame->PresContext();
nsLayoutUtils::TransformRect(rootFrame,
presContext->PresShell()->GetRootScrollFrame(), rect);
intersectionRect = Some(rect);