From a1093ea8682f5b5a611902028aecdcd2e8b43dbd Mon Sep 17 00:00:00 2001
From: Cameron McCormack <cam@mcc.id.au>
Date: Wed, 7 Jun 2017 13:22:00 +0800
Subject: [PATCH] style: always re-cascade in native anonymous subtrees

---
 components/style/traversal.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/components/style/traversal.rs b/components/style/traversal.rs
index 536ddf69f87..484bce5faad 100644
--- a/components/style/traversal.rs
+++ b/components/style/traversal.rs
@@ -690,6 +690,12 @@ pub fn recalc_style_at<E, D>(traversal: &D,
             ChildCascadeRequirement::CanSkipCascade => {}
         };
 
+        // We must always cascade native anonymous subtrees, since they inherit styles
+        // from their first non-NAC ancestor.
+        if element.is_native_anonymous() {
+            cascade_hint |= RECASCADE_SELF;
+        }
+
         // If we're restyling this element to display:none, throw away all style
         // data in the subtree, notify the caller to early-return.
         if data.styles().is_display_none() {