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-rw-r--r--dom/base/DOMIntersectionObserver.cpp15
1 files changed, 8 insertions, 7 deletions
diff --git a/dom/base/DOMIntersectionObserver.cpp b/dom/base/DOMIntersectionObserver.cpp
index f0be34ec0..5798335b4 100644
--- a/dom/base/DOMIntersectionObserver.cpp
+++ b/dom/base/DOMIntersectionObserver.cpp
@@ -319,6 +319,7 @@ DOMIntersectionObserver::Update(nsIDocument* aDocument, DOMHighResTimeStamp time
nsIFrame* targetFrame = target->GetPrimaryFrame();
nsRect targetRect;
Maybe<nsRect> intersectionRect;
+ bool isSameDoc = root && root->GetComposedDoc() == target->GetComposedDoc();
if (rootFrame && targetFrame) {
// If mRoot is set we are testing intersection with a container element
@@ -327,7 +328,7 @@ DOMIntersectionObserver::Update(nsIDocument* aDocument, DOMHighResTimeStamp time
// Skip further processing of this target if it is not in the same
// Document as the intersection root, e.g. if root is an element of
// the main document and target an element from an embedded iframe.
- if (target->GetComposedDoc() != root->GetComposedDoc()) {
+ if (!isSameDoc) {
continue;
}
// Skip further processing of this target if is not a descendant of the
@@ -399,12 +400,12 @@ DOMIntersectionObserver::Update(nsIDocument* aDocument, DOMHighResTimeStamp time
intersectionRectRelativeToRoot,
rootIntersectionRect
);
- if (intersectionRect.isSome()) {
- intersectionRect = Some(nsLayoutUtils::TransformFrameRectToAncestor(
- nsLayoutUtils::GetContainingBlockForClientRect(rootFrame),
- intersectionRect.value(),
- targetFrame->PresContext()->PresShell()->GetRootScrollFrame()
- ));
+ if (intersectionRect.isSome() && !isSameDoc) {
+ nsRect rect = intersectionRect.value();
+ nsPresContext* presContext = targetFrame->PresContext();
+ nsLayoutUtils::TransformRect(rootFrame,
+ presContext->PresShell()->GetRootScrollFrame(), rect);
+ intersectionRect = Some(rect);
}
}