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Test Info: Warnings

<!DOCTYPE html>
<meta charset=utf-8>
<title>NDEFReader.scan with an focused iframe</title>
<link rel="help" href=""/>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/nfc-helpers.js"></script>
nfc_test(async (t, mockNFC) => {
const ndef = new NDEFReader();
const controller = new AbortController();
const ndefWatcher = new EventWatcher(t, ndef, ["reading", "readingerror"]);
const promise = ndefWatcher.wait_for("reading").then(event => {
assert_true(event instanceof NDEFReadingEvent);
await ndef.scan({ signal: controller.signal });
const iframe = document.createElement('iframe');
iframe.src = 'resources/support-iframe.html';
const iframeLoadWatcher = new EventWatcher(t, iframe, 'load');
await iframeLoadWatcher.wait_for('load');
// Focus on iframe.
assert_true(iframe.contentDocument.hasFocus(), 'iframe gains the focus');
// Suspend NFC operations is async in blink, use setTimeout as a workaround.
// TODO( find a good way to eliminate this race
// condition.
await new Promise(resolve => t.step_timeout(resolve, 0));
await promise;
// Remove iframe from main document.
}, 'Test that NDEFReader.scan is not suspended if iframe gains focus.');