diff --git a/components/layout/display_list/background.rs b/components/layout/display_list/background.rs
index 19976a3bf83..7da2bff68d6 100644
--- a/components/layout/display_list/background.rs
+++ b/components/layout/display_list/background.rs
@@ -553,12 +553,12 @@ pub fn convert_linear_gradient(
     let angle = match direction {
         LineDirection::Angle(angle) => angle.radians(),
         LineDirection::Horizontal(x) => match x {
-            X::Left => Angle::Deg(270.).radians(),
-            X::Right => Angle::Deg(90.).radians(),
+            X::Left => Angle::from_degrees(270.).radians(),
+            X::Right => Angle::from_degrees(90.).radians(),
         },
         LineDirection::Vertical(y) => match y {
-            Y::Top => Angle::Deg(0.).radians(),
-            Y::Bottom => Angle::Deg(180.).radians(),
+            Y::Top => Angle::from_degrees(0.).radians(),
+            Y::Bottom => Angle::from_degrees(180.).radians(),
         },
         LineDirection::Corner(horizontal, vertical) => {
             // This the angle for one of the diagonals of the box. Our angle
diff --git a/components/script/dom/css.rs b/components/script/dom/css.rs
index 7a42d6b6e68..0f3c929460e 100644
--- a/components/script/dom/css.rs
+++ b/components/script/dom/css.rs
@@ -53,21 +53,21 @@ impl CSS {
     pub fn Supports_(win: &Window, condition: DOMString) -> bool {
         let mut input = ParserInput::new(&condition);
         let mut input = Parser::new(&mut input);
-        let cond = parse_condition_or_declaration(&mut input);
-        if let Ok(cond) = cond {
-            let url = win.Document().url();
-            let context = ParserContext::new_for_cssom(
-                &url,
-                Some(CssRuleType::Style),
-                ParsingMode::DEFAULT,
-                QuirksMode::NoQuirks,
-                None,
-                None,
-            );
-            cond.eval(&context)
-        } else {
-            false
-        }
+        let cond = match parse_condition_or_declaration(&mut input) {
+            Ok(c) => c,
+            Err(..) => return false,
+        };
+
+        let url = win.Document().url();
+        let context = ParserContext::new_for_cssom(
+            &url,
+            Some(CssRuleType::Style),
+            ParsingMode::DEFAULT,
+            QuirksMode::NoQuirks,
+            None,
+            None,
+        );
+        cond.eval(&context, &Default::default())
     }
 
     /// <https://drafts.css-houdini.org/css-paint-api-1/#paint-worklet>
diff --git a/components/script/dom/csssupportsrule.rs b/components/script/dom/csssupportsrule.rs
index 136a742e0e7..030a6c56be9 100644
--- a/components/script/dom/csssupportsrule.rs
+++ b/components/script/dom/csssupportsrule.rs
@@ -81,7 +81,17 @@ impl CSSSupportsRule {
                 None,
                 None,
             );
-            let enabled = cond.eval(&context);
+            let enabled = {
+                let namespaces =
+                    self
+                        .cssconditionrule
+                        .parent_stylesheet()
+                        .style_stylesheet()
+                        .contents
+                        .namespaces
+                        .read();
+                cond.eval(&context, &namespaces)
+            };
             let mut guard = self.cssconditionrule.shared_lock().write();
             let rule = self.supportsrule.write_with(&mut guard);
             rule.condition = cond;