Make a bool for display: list-item available to flow box construction

components/layout_2020/dom_traversal.rs

@@ -219,7 +219,9 @@ fn traverse_pseudo_element_contents<'dom, Node>(
                 });
                 let display_inline = DisplayGeneratingBox::OutsideInside {
                     outside: DisplayOutside::Inline,
-                    inside: DisplayInside::Flow,
+                    inside: DisplayInside::Flow {
+                        is_list_item: false,
+                    },
                 };
                 // `display` is not inherited, so we get the initial value
                 debug_assert!(