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-rw-r--r--layout/tables/nsTableWrapperFrame.cpp7
1 files changed, 5 insertions, 2 deletions
diff --git a/layout/tables/nsTableWrapperFrame.cpp b/layout/tables/nsTableWrapperFrame.cpp
index 476024e96..86f032218 100644
--- a/layout/tables/nsTableWrapperFrame.cpp
+++ b/layout/tables/nsTableWrapperFrame.cpp
@@ -187,8 +187,11 @@ nsTableWrapperFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
BuildDisplayListForChild(aBuilder, mCaptionFrames.FirstChild(), captionSet);
// Now we have to sort everything by content order, since the caption
- // may be somewhere inside the table
- set.BlockBorderBackgrounds()->SortByContentOrder(GetContent());
+ // may be somewhere inside the table.
+ // We don't sort BlockBorderBackgrounds and BorderBackgrounds because the
+ // display items in those lists should stay out of content order in order to
+ // follow the rules in https://www.w3.org/TR/CSS21/zindex.html#painting-order
+ // and paint the caption background after all of the rest.
set.Floats()->SortByContentOrder(GetContent());
set.Content()->SortByContentOrder(GetContent());
set.PositionedDescendants()->SortByContentOrder(GetContent());