From 766feec4c09c9d8ead9eedcb409d303dea7363ce Mon Sep 17 00:00:00 2001
From: Xidorn Quan <me@upsuper.org>
Date: Wed, 24 May 2017 20:27:18 +1000
Subject: [PATCH] Reject "text" value in background shorthand.

---
 components/style/properties/shorthand/background.mako.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/components/style/properties/shorthand/background.mako.rs b/components/style/properties/shorthand/background.mako.rs
index b4f3f9fe079..58f0361cffa 100644
--- a/components/style/properties/shorthand/background.mako.rs
+++ b/components/style/properties/shorthand/background.mako.rs
@@ -69,6 +69,13 @@
                     if ${name}.is_none() {
                         if let Ok(value) = input.try(|input| background_${name}::single_value
                                                                                ::parse(context, input)) {
+                            % if name == "clip" and product == "gecko":
+                            // "text" value of background-clip should not be part of background
+                            // shorthand per current spec and impls.
+                            if value == background_clip::single_value::SpecifiedValue::text {
+                                return Err(());
+                            }
+                            % endif
                             ${name} = Some(value);
                             continue
                         }