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+<!DOCTYPE html>
+<html>
+<head>
+  <title>time origin value manual test</title>
+  <link rel="help" href="https://w3c.github.io/hr-time/#time-origin-1">
+  <link rel="prefetch" href="./resources/unload-a.html">
+  <link rel="prefetch" href="./resources/unload-b.html">
+  <link rel="prefetch" href="./resources/unload-c.html">
+</head>
+<body>
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script>
+    setup({ explicit_timeout: true });
+
+    const ACCEPTABLE_VARIANCE = 400; // ms
+
+    const isRoughlyEqual = (a, b) => Math.abs(a - b) < ACCEPTABLE_VARIANCE;
+
+    const timings = { a: {}, b: {}, c: {} };
+    const t = async_test("hr-time time origin");
+
+    window.mark = msg => {
+      timings[msg.docName][msg.lifecycleEventName] = {
+        performanceNow: msg.performanceNow,
+        dateNow: msg.dateNow
+      };
+
+      if (msg.docName === "c" && msg.lifecycleEventName === "unload") {
+        setTimeout(makeAssertions, 0);
+      }
+    };
+
+    function makeAssertions () {
+      t.step(() => {
+        const loadTimeBetweenAandB = timings.b.load.dateNow - timings.a.unload.dateNow;
+        const loadTimeBetweenBandC = timings.c.load.dateNow - timings.b.unload.dateNow;
+
+        assert_true(
+          isRoughlyEqual(loadTimeBetweenAandB, timings.b.load.performanceNow),
+          "Document in reused window's time origin should be time of close of pop-up box."
+        );
+        assert_true(
+          isRoughlyEqual(loadTimeBetweenBandC, timings.c.load.performanceNow),
+          "Document in reused window's time origin should be time of close of pop-up box."
+        );
+        assert_true(
+          !isRoughlyEqual(timings.a.unload.performanceNow, 0),
+          "Time origin during unload event should match that of rest of document."
+        );
+        assert_true(
+          !isRoughlyEqual(timings.b.unload.performanceNow, 0),
+          "Time origin during unload event should match that of rest of document."
+        );
+        assert_true(
+          !isRoughlyEqual(timings.c.unload.performanceNow, 0),
+          "Time origin during unload event should match that of rest of document."
+        );
+      });
+      t.done();
+    }
+  </script>
+
+  <h2>Description</h2>
+  <p>This test validates the behavior of <code>performance.now()</code> with respect to its time origin.</p>
+  <div id="log">
+   <h2>Manual Test Steps</h2>
+   <ol>
+    <li><a href="resources/unload-a.html" target="_blank">Click here</a>
+   </ol>
+  </div>
+</body>
+<html>