diff --git a/components/script/dom/webidls/CSSStyleDeclaration.webidl b/components/script/dom/webidls/CSSStyleDeclaration.webidl
index ef75f29501a..1908b908203 100644
--- a/components/script/dom/webidls/CSSStyleDeclaration.webidl
+++ b/components/script/dom/webidls/CSSStyleDeclaration.webidl
@@ -209,6 +209,8 @@ partial interface CSSStyleDeclaration {
 
   [CEReactions, SetterThrows, TreatNullAs=EmptyString] attribute DOMString filter;
 
+  [CEReactions, SetterThrows, TreatNullAs=EmptyString] attribute DOMString inset;
+
   [CEReactions, SetterThrows, TreatNullAs=EmptyString] attribute DOMString lineHeight;
   [CEReactions, SetterThrows, TreatNullAs=EmptyString] attribute DOMString line-height;
 
diff --git a/components/style/lib.rs b/components/style/lib.rs
index 4976c787a68..2ea20088ed0 100644
--- a/components/style/lib.rs
+++ b/components/style/lib.rs
@@ -37,9 +37,9 @@ extern crate crossbeam_channel;
 #[macro_use]
 extern crate cssparser;
 #[macro_use]
-extern crate derive_more;
-#[macro_use]
 extern crate debug_unreachable;
+#[macro_use]
+extern crate derive_more;
 extern crate euclid;
 extern crate fallible;
 extern crate fxhash;