5 files changed, 75 insertions, 0 deletions
diff --git a/components/script/dom/mod.rs b/components/script/dom/mod.rs
index d20b68c92b7..0a654f93c57 100644
--- a/components/script/dom/mod.rs
+++ b/components/script/dom/mod.rs
@@ -428,6 +428,7 @@ pub mod performance;
 pub mod performanceentry;
 pub mod performancemark;
 pub mod performancemeasure;
+pub mod performancenavigation;
 pub mod performancenavigationtiming;
 pub mod performanceobserver;
 pub mod performanceobserverentrylist;
diff --git a/components/script/dom/performance.rs b/components/script/dom/performance.rs
index 9dff17fd872..b29858fdca5 100644
--- a/components/script/dom/performance.rs
+++ b/components/script/dom/performance.rs
@@ -19,6 +19,7 @@ use crate::dom::globalscope::GlobalScope;
 use crate::dom::performanceentry::PerformanceEntry;
 use crate::dom::performancemark::PerformanceMark;
 use crate::dom::performancemeasure::PerformanceMeasure;
+use crate::dom::performancenavigation::PerformanceNavigation;
 use crate::dom::performancenavigationtiming::PerformanceNavigationTiming;
 use crate::dom::performanceobserver::PerformanceObserver as DOMPerformanceObserver;
 use crate::dom::window::Window;
@@ -372,6 +373,11 @@ impl PerformanceMethods for Performance {
         unreachable!("Are we trying to expose Performance.timing in workers?");
     }
 
+    // https://w3c.github.io/navigation-timing/#dom-performance-navigation
+    fn Navigation(&self) -> DomRoot<PerformanceNavigation> {
+        PerformanceNavigation::new(&self.global())
+    }
+
     // https://dvcs.w3.org/hg/webperf/raw-file/tip/specs/HighResolutionTime/Overview.html#dom-performance-now
     fn Now(&self) -> DOMHighResTimeStamp {
         Finite::wrap(self.now())
diff --git a/components/script/dom/performancenavigation.rs b/components/script/dom/performancenavigation.rs
new file mode 100644
index 00000000000..db93441480f
--- /dev/null
+++ b/components/script/dom/performancenavigation.rs
@@ -0,0 +1,45 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use crate::dom::bindings::codegen::Bindings::PerformanceNavigationBinding::{
+    self, PerformanceNavigationConstants, PerformanceNavigationMethods,
+};
+use crate::dom::bindings::codegen::Bindings::WindowBinding::WindowBinding::WindowMethods;
+use crate::dom::bindings::reflector::{reflect_dom_object, DomObject, Reflector};
+use crate::dom::bindings::root::DomRoot;
+use crate::dom::globalscope::GlobalScope;
+use dom_struct::dom_struct;
+
+#[dom_struct]
+pub struct PerformanceNavigation {
+    reflector_: Reflector,
+}
+
+impl PerformanceNavigation {
+    fn new_inherited() -> PerformanceNavigation {
+        PerformanceNavigation {
+            reflector_: Reflector::new(),
+        }
+    }
+
+    pub fn new(global: &GlobalScope) -> DomRoot<PerformanceNavigation> {
+        reflect_dom_object(
+            Box::new(PerformanceNavigation::new_inherited()),
+            global,
+            PerformanceNavigationBinding::Wrap,
+        )
+    }
+}
+
+impl PerformanceNavigationMethods for PerformanceNavigation {
+    // https://w3c.github.io/navigation-timing/#dom-performancenavigation-type
+    fn Type(&self) -> u16 {
+        PerformanceNavigationConstants::TYPE_NAVIGATE
+    }
+
+    // https://w3c.github.io/navigation-timing/#dom-performancenavigation-redirectcount
+    fn RedirectCount(&self) -> u16 {
+        self.global().as_window().Document().get_redirect_count()
+    }
+}
diff --git a/components/script/dom/webidls/Performance.webidl b/components/script/dom/webidls/Performance.webidl
index 45358ffa6e8..77bca4392e7 100644
--- a/components/script/dom/webidls/Performance.webidl
+++ b/components/script/dom/webidls/Performance.webidl
@@ -49,3 +49,8 @@ partial interface Performance {
 partial interface Performance {
   PerformanceNavigationTiming timing();
 };
+// https://w3c.github.io/navigation-timing/#extensions-to-the-performance-interface
+partial interface Performance {
+  [SameObject, Exposed=Window]
+  readonly attribute PerformanceNavigation navigation;
+};
diff --git a/components/script/dom/webidls/PerformanceNavigation.webidl b/components/script/dom/webidls/PerformanceNavigation.webidl
new file mode 100644
index 00000000000..5a1ccba61f1
--- /dev/null
+++ b/components/script/dom/webidls/PerformanceNavigation.webidl
@@ -0,0 +1,18 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+/*
+ * The origin of this IDL file is
+ * https://w3c.github.io/navigation-timing/#the-performancenavigation-interface
+ */
+
+[Exposed=Window]
+interface PerformanceNavigation {
+  const unsigned short TYPE_NAVIGATE = 0;
+  const unsigned short TYPE_RELOAD = 1;
+  const unsigned short TYPE_BACK_FORWARD = 2;
+  const unsigned short TYPE_RESERVED = 255;
+  readonly attribute unsigned short type;
+  readonly attribute unsigned short redirectCount;
+  // [Default] object toJSON();
+};