1 files changed, 7 insertions, 0 deletions
diff --git a/components/script/dom/bindings/cell.rs b/components/script/dom/bindings/cell.rs
index 9ec04e358e5..dabc88284b6 100644
--- a/components/script/dom/bindings/cell.rs
+++ b/components/script/dom/bindings/cell.rs
@@ -94,6 +94,13 @@ impl<T> DOMRefCell<T> {
             _ => None,
         }
     }
+
+    /// Version of the above that we use during restyle while the script task
+    /// is blocked.
+    pub fn borrow_mut_for_layout(&self) -> RefMut<T> {
+        debug_assert!(task_state::get().is_layout());
+        self.value.borrow_mut()
+    }
 }
 
 impl<T: JSTraceable> JSTraceable for DOMRefCell<T> {