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Test Info: Warnings

<!doctype html>
<meta charset="utf-8">
<title>Async should not trigger resource loading</title>
<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/user-activation.js"></script>
<body>Body needed for
<p><button id="button">Put payload in the clipboard</button></p>
<div id="output"></div>
button.onclick = () => document.execCommand('copy');
document.oncopy = ev => {
'<img src="">');
promise_test(async test => {
let loadObserved = false;
const observer = new PerformanceObserver(() => loadObserved = true);
observer.observe({type: 'resource'});
await test_driver.set_permission({name: 'clipboard-read'}, 'granted');
await waitForUserActivation();
const items = await;
const htmlBlob = await items[0].getType("text/html");
const html = await htmlBlob.text();
assert_equals(html, '<img src="">');
// Allow resource loading to start asynchronously
await new Promise(resolve => test.step_timeout(resolve, 100));
assert_false(loadObserved, 'Should not observe resource loading');