From 18baf5ec7849acf8931d94c643a2b1ae85ca0d7f Mon Sep 17 00:00:00 2001
From: Bobby Holley <bobbyholley@gmail.com>
Date: Wed, 17 May 2017 18:48:08 +0200
Subject: [PATCH] Only use the parallel traversal when traversing from the
 root.

---
 ports/geckolib/glue.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ports/geckolib/glue.rs b/ports/geckolib/glue.rs
index b18454320f7..afbb8c7ef57 100644
--- a/ports/geckolib/glue.rs
+++ b/ports/geckolib/glue.rs
@@ -217,7 +217,7 @@ fn traverse_subtree(element: GeckoElement,
     };
 
     let traversal = RecalcStyleOnly::new(shared_style_context, traversal_driver);
-    if traversal_driver.is_parallel() {
+    if traversal_driver.is_parallel() && element.is_root() {
         parallel::traverse_dom(&traversal, element, token,
                                global_style_data.style_thread_pool.as_ref().unwrap());
     } else {