1 files changed, 17 insertions, 0 deletions
diff --git a/components/layout/traversal.rs b/components/layout/traversal.rs
index 4fb3838d18e..88a6514433b 100644
--- a/components/layout/traversal.rs
+++ b/components/layout/traversal.rs
@@ -30,6 +30,10 @@ impl<'a> RecalcStyleAndConstructFlows<'a> {
         RecalcStyleAndConstructFlows { context: context }
     }
 
+    pub fn context(&self) -> &LayoutContext<'a> {
+        &self.context
+    }
+
     /// Consumes this traversal context, returning ownership of the shared layout
     /// context to the caller.
     pub fn destroy(self) -> LayoutContext<'a> {
@@ -183,6 +187,19 @@ where
     fn process(&mut self, node: &ConcreteThreadSafeLayoutNode);
 }
 
+#[allow(unsafe_code)]
+#[inline]
+pub unsafe fn construct_flows_at_ancestors<'dom>(
+    context: &LayoutContext,
+    mut node: impl LayoutNode<'dom>,
+) {
+    while let Some(element) = node.traversal_parent() {
+        element.set_dirty_descendants();
+        node = element.as_node();
+        construct_flows_at(context, node);
+    }
+}
+
 /// The flow construction traversal, which builds flows for styled nodes.
 #[inline]
 #[allow(unsafe_code)]