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Test Info: Warnings

<!DOCTYPE html>
<meta charset=utf-8 />
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script src=/resources/testdriver.js></script>
<script src=/resources/testdriver-vendor.js></script>
<script src=resources/event-timing-test-utils.js></script>
<button id='the_button'>ClickMe</button>
async_test(function(t) {
assert_implements(window.PerformanceEventTiming, 'Event Timing is not supported.');
const observer = new PerformanceObserver(t.step_func_done((entryList) => {
const entries = entryList.getEntries().filter(e => === 'pointerdown');
if (entries.length === 0)
// There must only be one click entry.
assert_equals(entries.length, 1);
const entry = entries[0];
// This checks that returns the correct button Node.
verifyClickEvent(entry, 'the_button', true);
const button = document.getElementById('the_button');
// After removing the button, should now return null.
assert_equals(, null);
observer.observe({entryTypes: ['event']});
}, "Event Timing: when target is disconnected, returns null.");