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diff --git a/testing/web-platform/tests/performance-timeline/po-observe.html b/testing/web-platform/tests/performance-timeline/po-observe.html
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+++ b/testing/web-platform/tests/performance-timeline/po-observe.html
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+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>PerformanceObservers: observe</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="performanceobservers.js"></script>
+<h1>PerformanceObservers: observe</h1>
+<div id="log"></div>
+<script>
+  test(function () {
+    var obs = new PerformanceObserver(function () { return true; });
+    assert_throws(new TypeError(), function () {
+      obs.observe({});
+    });
+    assert_throws(new TypeError(), function () {
+      obs.observe({entryType: []});
+    });
+  }, "no entryTypes throws a TypeError");
+  test(function () {
+    var obs = new PerformanceObserver(function () { return true; });
+    assert_throws(new TypeError(), function () {
+      obs.observe({entryTypes: "mark"});
+    });
+    assert_throws(new TypeError(), function () {
+      obs.observe({entryTypes: []});
+    });
+    assert_throws(new TypeError(), function () {
+      obs.observe({entryTypes: ["this-cannot-match-an-entryType"]});
+    });
+    assert_throws(new TypeError(), function () {
+      obs.observe({entryTypes: ["marks","navigate", "resources"]});
+    });
+  }, "Empty sequence entryTypes throws a TypeError");
+
+  test(function () {
+    var obs = new PerformanceObserver(function () { return true; });
+    obs.observe({entryTypes: ["mark","this-cannot-match-an-entryType"]});
+    obs.observe({entryTypes: ["this-cannot-match-an-entryType","mark"]});
+    obs.observe({entryTypes: ["mark"], others: true});
+  }, "Filter unsupported entryType entryType names within the entryTypes sequence");
+
+  async_test(function (t) {
+  var observer = new PerformanceObserver(
+      t.step_func(function (entryList, obs) {
+        assert_equals(observer, obs, "observer is second parameter");
+        checkEntries(entryList.getEntries(),
+          [{ entryType: "measure", name: "measure1"}]);
+        observer.disconnect();
+        t.done();
+      })
+    );
+    performance.clearMarks();
+    observer.observe({entryTypes: ["mark"]});
+    observer.observe({entryTypes: ["measure"]});
+    performance.mark("mark1");
+    performance.measure("measure1");
+  }, "replace observer if already present");
+</script>