From dbe1c3f9a9379511d6f951b25643a4264bc4a8fa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Emilio=20Cobos=20=C3=81lvarez?= <emilio@crisal.io>
Date: Sat, 22 Apr 2017 22:53:03 +0200
Subject: [PATCH] Bug 1331047: Require a child iterator for elements with
 ::before and ::after pseudos. r=bholley

MozReview-Commit-ID: e1UTlnNn3X
---
 dom/base/ChildIterator.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/dom/base/ChildIterator.cpp b/dom/base/ChildIterator.cpp
index 7fa9e180cf70..851f4630e51c 100644
--- a/dom/base/ChildIterator.cpp
+++ b/dom/base/ChildIterator.cpp
@@ -512,6 +512,16 @@ StyleChildrenIterator::IsNeeded(const Element* aElement)
     }
   }
 
+  // If the node has a ::before or ::after pseudo, return true, because we want
+  // to visit those.
+  //
+  // TODO(emilio): Make this fast adding a bit? or, perhaps just using
+  // ProbePseudoElementStyle? It should be quite fast in Stylo.
+  if (aElement->GetProperty(nsGkAtoms::beforePseudoProperty) ||
+      aElement->GetProperty(nsGkAtoms::afterPseudoProperty)) {
+    return true;
+  }
+
   // If the node has native anonymous content, return true.
   nsIAnonymousContentCreator* ac = do_QueryFrame(aElement->GetPrimaryFrame());
   if (ac) {