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diff --git a/testing/web-platform/tests/performance-timeline/po-disconnect.html b/testing/web-platform/tests/performance-timeline/po-disconnect.html
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+++ b/testing/web-platform/tests/performance-timeline/po-disconnect.html
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+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>PerformanceObservers: disconnect</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="performanceobservers.js"></script>
+<h1>PerformanceObservers: disconnect</h1>
+<div id="log"></div>
+<script>
+  async_test(function (t) {
+    var observer = new PerformanceObserver(
+        t.step_func(function (entryList, obs) {
+          assert_unreached("This callback must not be invoked");
+        })
+      );
+    observer.observe({entryTypes: ["mark", "measure", "navigation"]});
+    observer.disconnect();
+    performance.mark("mark1");
+    performance.measure("measure1");
+    t.step_timeout(function () {
+      t.done();
+    }, 2000);
+  }, "disconnected callbacks must not be invoked");
+
+  test(function () {
+    var obs = new PerformanceObserver(function () { return true; });
+    obs.disconnect();
+    obs.disconnect();
+  }, "disconnecting an unconnected observer is a no-op");
+
+  async_test(function (t) {
+    var observer = new PerformanceObserver(
+        t.step_func(function(entryList, obs) {
+          checkEntries(entryList.getEntries(),
+            [{ entryType: "mark", name: "mark1"}]);
+          t.done();
+        })
+      );
+    observer.observe({entryTypes: ["mark"]});
+    performance.mark("mark1");
+    observer.disconnect();
+    performance.mark("mark2");
+  }, "An observer disconnected after a mark must receive the mark");
+</script>