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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>AmbientLightSensor Test: onchange</title>
+<link rel="author" title="Intel" href="http://www.intel.com">
+<link rel="help" href="https://www.w3.org/TR/ambient-light/">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<h2>Description</h2>
+<p>
+  This test validates that the "onchange" event can be invoked when changing the ambient light illuminance of the device.
+</p>
+
+<h2>Precondition</h2>
+<ol>
+  <li>
+    Change the ambient light illuminance of the device.
+  </li>
+</ol>
+
+<script>
+
+async_test(function(t) {
+  let sensor = new AmbientLightSensor();
+  sensor.start();
+
+  sensor.onchange = t.step_func_done(function(event) {
+    sensor.stop();
+  });
+
+  sensor.onerror = t.step_func_done(function(event) {
+    assert_unreached(event.error.name + ":" + event.error.message);
+  });
+}, "event change fired");
+
+</script>