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<!DOCTYPE html>
<title>Access to the Midi API with sysex=true is deferred</title>
<meta name="timeout" content="long">
<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="/common/utils.js"></script>
<script src="/speculation-rules/prerender/resources/utils.js"></script>
<body>
<script>
setup(() => assertSpeculationRulesIsSupported());
promise_test(async t => {
const uid = token();
const bc = new PrerenderChannel('test-channel', uid);
t.add_cleanup(_ => bc.close());
// Grant the permission here to make a more discerning test because
// navigator.requestMIDIAccess() waits until the permission is granted, which
// is deferred during prerendering so the test would trivially pass without
// the permission.
await test_driver.set_permission(
{name: 'midi', sysex: true}, 'granted');
const gotMessage = new Promise(resolve => {
bc.addEventListener('message', e => {
resolve(e.data);
}, {
once: true
});
});
const url = `resources/midi.https.html?sysex=true&uid=${uid}`;
window.open(url, '_blank', 'noopener');
const result = await gotMessage;
const expected = [
{
event: 'started waiting navigator.requestMIDIAccess',
prerendering: true
},
{
event: 'prerendering change',
prerendering: false
},
{
event: 'finished waiting navigator.requestMIDIAccess',
prerendering: false
},
];
assert_equals(result.length, expected.length);
for (let i = 0; i < result.length; i++) {
assert_equals(result[i].event, expected[i].event, `event${i}`);
assert_equals(result[i].prerendering, expected[i].prerendering,
`prerendering${i}`);
}
// Send a close signal to PrerenderEventCollector on the prerendered page.
new PrerenderChannel('close', uid).postMessage('');
}, `the access to the Midi API should be deferred until the prerendered page is
activated`);
</script>
</body>
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