diff --git a/components/layout/display_list_builder.rs b/components/layout/display_list_builder.rs
index 8710c519de0..59264e24a8f 100644
--- a/components/layout/display_list_builder.rs
+++ b/components/layout/display_list_builder.rs
@@ -1011,9 +1011,15 @@ impl FragmentDisplayListBuilding for Fragment {
// because layout for the iframe only needs to know size, and origin is only relevant if
// the iframe is actually going to be displayed.
if let SpecificFragmentInfo::Iframe(ref iframe_fragment) = self.specific {
- self.finalize_position_and_size_of_iframe(&**iframe_fragment,
- stacking_relative_border_box.origin,
- layout_context)
+ let stacking_relative_border_box_in_parent_coordinate_system =
+ self.stacking_relative_border_box(stacking_relative_flow_origin,
+ relative_containing_block_size,
+ relative_containing_block_mode,
+ CoordinateSystem::Parent);
+ self.finalize_position_and_size_of_iframe(
+ &**iframe_fragment,
+ stacking_relative_border_box_in_parent_coordinate_system.origin,
+ layout_context)
}
}
diff --git a/tests/ref/basic.list b/tests/ref/basic.list
index d4302a6099f..72f98ee3402 100644
--- a/tests/ref/basic.list
+++ b/tests/ref/basic.list
@@ -137,6 +137,7 @@ flaky_cpu == append_style_a.html append_style_b.html
== iframe/simple_inline_width_percentage.html iframe/simple_inline_width_percentage_ref.html
== iframe/size_attributes.html iframe/size_attributes_ref.html
experimental == iframe/size_attributes_vertical_writing_mode.html iframe/size_attributes_ref.html
+== iframe/stacking_context.html iframe/stacking_context_ref.html
!= image_rendering_auto_a.html image_rendering_pixelated_a.html
== image_rendering_pixelated_a.html image_rendering_pixelated_ref.html
diff --git a/tests/ref/iframe/stacking_context.html b/tests/ref/iframe/stacking_context.html
new file mode 100644
index 00000000000..feeea572eaa
--- /dev/null
+++ b/tests/ref/iframe/stacking_context.html
@@ -0,0 +1,13 @@
+
+
+