diff --git a/components/script/dom/cssrule.rs b/components/script/dom/cssrule.rs
index 560124ef030..b9cc5c19dbd 100644
--- a/components/script/dom/cssrule.rs
+++ b/components/script/dom/cssrule.rs
@@ -98,8 +98,9 @@ impl CSSRule {
                 DomRoot::upcast(CSSSupportsRule::new(window, parent_stylesheet, s))
             },
             StyleCssRule::Page(_) => unreachable!(),
-            StyleCssRule::Document(_) => unimplemented!(), // TODO
-            StyleCssRule::Viewport(_) => unimplemented!(), // TODO
+            StyleCssRule::Container(_) => unimplemented!(), // TODO
+            StyleCssRule::Document(_) => unimplemented!(),  // TODO
+            StyleCssRule::Viewport(_) => unimplemented!(),  // TODO
             StyleCssRule::LayerBlock(_) => unimplemented!(), // TODO
             StyleCssRule::LayerStatement(_) => unimplemented!(), // TODO
             StyleCssRule::ScrollTimeline(_) => unimplemented!(), // TODO
diff --git a/components/style/stylesheets/rule_parser.rs b/components/style/stylesheets/rule_parser.rs
index 72fcdefd6f4..b9ebfc475c2 100644
--- a/components/style/stylesheets/rule_parser.rs
+++ b/components/style/stylesheets/rule_parser.rs
@@ -414,6 +414,13 @@ impl<'a, 'b> NestedRuleParser<'a, 'b> {
     }
 }
 
+fn container_queries_enabled() -> bool {
+    #[cfg(feature = "gecko")]
+    return static_prefs::pref!("layout.css.container-queries.enabled");
+    #[cfg(feature = "servo")]
+    return false;
+}
+
 impl<'a, 'b, 'i> AtRuleParser<'i> for NestedRuleParser<'a, 'b> {
     type Prelude = AtRulePrelude;
     type AtRule = CssRule;
@@ -437,7 +444,7 @@ impl<'a, 'b, 'i> AtRuleParser<'i> for NestedRuleParser<'a, 'b> {
             "font-face" => {
                 AtRulePrelude::FontFace
             },
-            "container" if static_prefs::pref!("layout.css.container-queries.enabled") => {
+            "container" if container_queries_enabled() => {
                 // FIXME: This is a bit ambiguous:
                 // https://github.com/w3c/csswg-drafts/issues/7203
                 let name = input.try_parse(|input| {