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Test Info: Warnings

<!doctype html>
<meta charset="utf-8">
<title>Async should sanitize text/html</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>
let testFailed = false;
function fail() {
testFailed = true;
button.onclick = () => document.execCommand('copy');
document.oncopy = ev => {
`<form><math><mtext></form><form><mglyph><xmp></math><img src=invalid onerror=fail()></xmp>`);
promise_test(async test => {
await tryGrantReadPermission();
await waitForUserActivation();
const items = await;
const htmlBlob = await items[0].getType("text/html");
const html = await htmlBlob.text();
// This inserts an image with `onerror` handler if `html` is not properly sanitized
output.innerHTML = html;
// Allow the 'error' event to be dispatched asynchronously
await new Promise(resolve => test.step_timeout(resolve, 100));