From f0fbcf204ea1b19adab45c22666ddbd466e3f7d2 Mon Sep 17 00:00:00 2001
From: Yusuf Sermet <ysermet@mozilla.com>
Date: Mon, 28 May 2018 23:54:01 -0700
Subject: [PATCH] style: Create a stacking context for contain:paint.

Bug: 1463599
Reviewed-by: mattwoodrow
MozReview-Commit-ID: Ln72MOlHXwi
---
 components/style/properties/longhand/box.mako.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/components/style/properties/longhand/box.mako.rs b/components/style/properties/longhand/box.mako.rs
index 026a3ca7936..f8389a19a79 100644
--- a/components/style/properties/longhand/box.mako.rs
+++ b/components/style/properties/longhand/box.mako.rs
@@ -593,7 +593,7 @@ ${helpers.predefined_type("contain",
                           "specified::Contain::empty()",
                           animation_value_type="discrete",
                           products="gecko",
-                          flags="FIXPOS_CB",
+                          flags="CREATES_STACKING_CONTEXT FIXPOS_CB",
                           gecko_pref="layout.css.contain.enabled",
                           spec="https://drafts.csswg.org/css-contain/#contain-property")}