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diff --git a/testing/web-platform/tests/pointerlock/pointerlock_leave_Tab-manual.html b/testing/web-platform/tests/pointerlock/pointerlock_leave_Tab-manual.html
new file mode 100644
index 000000000..198e2fe63
--- /dev/null
+++ b/testing/web-platform/tests/pointerlock/pointerlock_leave_Tab-manual.html
@@ -0,0 +1,85 @@
+<!DOCTYPE html>
+<html>
+<body>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<meta name='flags' content='interact'>
+<meta name="timeout" content="long">
+<style type="text/css">
+    button {
+        color: blue;
+    }
+
+    #target-wrap {
+        position: relative;
+        background-color: lightgrey;
+        width: 200px;
+        height: 100px;
+        border: grey 1px solid;
+    }
+
+    #target {
+        position: relative;
+        background-color: lightyellow;
+        width: 100px;
+        height: 30px;
+        border: yellow 1px solid;
+    }
+
+    #status-log {
+        margin: 10px 0;
+        color: green;
+    }
+</style>
+</head>
+<body>
+    <h2>Description</h2>
+    <p>This test validates that pointer lock will be lost the user agent / window loses focus.</p>
+    <hr/>
+
+    <h2>Manual Test Steps:</h2>
+    <p>
+        <ol>
+            <li>Click the "lockTarget" button to request a pointer lock.</li>
+            <li>Focus to another tab with keyboard (Ctrl-TAB).</li>
+            <li>Test is done.</li>
+        </ol>
+    </p>
+    <hr/>
+
+    <button onclick="lockTarget();">lockTarget</button>
+
+    <div id="target-wrap">
+        <div id="status-log">Click the "lockTarget" button.</div>
+        <div id="target">Target</div>
+    </div>
+    <hr/>
+
+    <div id="log"></div>
+
+    <script type="text/javascript" >
+        var target = document.querySelector('#target'),
+            status_log = document.querySelector('#status-log');
+
+        var leaveTabTest = async_test("Test that pointer lock will be lost when the current Tab loses focus.");
+
+    document.addEventListener("pointerlockchange", function() {
+        if(document.pointerLockElement) {
+            status_log.innerHTML = "Please leave the current tab.";
+        } else {
+            status_log.innerHTML = "Pointer lock exited!";
+
+            leaveTabTest.step(function() {
+                assert_true(document.pointerLockElement === null, "Pointer lock exited!");
+            });
+
+            leaveTabTest.done();
+        }
+    });
+
+    function lockTarget() {
+        target.requestPointerLock();
+    }
+    </script>
+    </body>
+</html>