1 files changed, 20 insertions, 0 deletions
diff --git a/testing/web-platform/tests/navigation-timing/supported-navigation-type.window.js b/testing/web-platform/tests/navigation-timing/supported-navigation-type.window.js
new file mode 100644
index 0000000000..3239c7d29f
--- /dev/null
+++ b/testing/web-platform/tests/navigation-timing/supported-navigation-type.window.js
@@ -0,0 +1,20 @@
+test(() => {
+  if (typeof PerformanceObserver.supportedEntryTypes === "undefined")
+    assert_unreached("supportedEntryTypes is not supported.");
+  assert_true(PerformanceObserver.supportedEntryTypes.includes("navigation"),
+    "There should be an entry 'navigation' in PerformanceObserver.supportedEntryTypes");
+}, "supportedEntryTypes contains 'navigation'.");
+
+if (typeof PerformanceObserver.supportedEntryTypes !== "undefined") {
+  const entryType = "navigation";
+  if (PerformanceObserver.supportedEntryTypes.includes(entryType)) {
+    promise_test(async() => {
+      await new Promise((resolve) => {
+        new PerformanceObserver(function (list, observer) {
+          observer.disconnect();
+          resolve();
+        }).observe({entryTypes: [entryType]});
+      })
+    }, `'${entryType}' entries should be observable.`)
+  }
+}