Allow adjusting box offsets

components/layout_2020/flow/mod.rs

@@ -352,6 +352,9 @@ impl BlockLevelBox {
             BlockLevelBox::OutOfFlowAbsolutelyPositionedBox(box_) => {
                 let hoisted_box = AbsolutelyPositionedBox::to_hoisted(
                     box_.clone(),
+                    // This is incorrect, however we do not know the
+                    // correct positioning until later, in place_block_level_fragment,
+                    // and this value will be adjusted there
                     Vec2::zero(),
                     tree_rank,
                     containing_block,