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<!DOCTYPE HTML>
<title>Test the correct sequence of pagevisibility-related events in conjunction with history navigation</title>
<link rel="author" title="Noam Rosenthal" href="mailto:noam@webkit.org">
<link rel="help" href="https://www.w3.org/TR/page-visibility-2/">
<meta name="timeout" content="long">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>
const iframePath1 = 'resources/iframe-post-load.html?v=1'
const iframePath2 = 'resources/iframe-post-load.html?v=2'
function waitForLoad(iframe) {
return new Promise(resolve => {
const callback = e => {
if (e.data === 'load') {
window.removeEventListener('message', callback)
resolve()
}
}
window.addEventListener('message', callback)
})
}
function assert_sequence(sequence) {
assert_equals(sequence.length, 2)
assert_equals(sequence[0].type, 'pagehide')
assert_equals(sequence[0].target, '#document')
assert_equals(sequence[0].visibilityState, 'visible')
assert_equals(sequence[0].cancelable, true)
assert_equals(sequence[1].type, 'visibilitychange')
assert_equals(sequence[1].target, '#document')
assert_equals(sequence[1].visibilityState, 'hidden')
assert_equals(sequence[1].cancelable, false)
}
promise_test(async t => {
const iframe = document.createElement('iframe');
iframe.src = iframePath1;
document.body.appendChild(iframe);
let sequence = [];
t.add_cleanup(() => iframe.remove());
iframe.src = iframePath1;
await waitForLoad(iframe);
const handler = t.step_func(event => sequence.push({
type: event.type,
target: event.target.nodeName,
cancelable: event.cancelable,
visibilityState: iframe.contentWindow.document.visibilityState
}));
iframe.contentWindow.document.addEventListener('visibilitychange', handler);
iframe.contentWindow.addEventListener('pagehide', handler);
iframe.contentWindow.location.href = iframePath2;
await waitForLoad(iframe);
assert_sequence(sequence);
sequence = [];
iframe.contentWindow.addEventListener('pagehide', handler);
iframe.contentWindow.document.addEventListener('visibilitychange', handler);
iframe.contentWindow.history.back();
await waitForLoad(iframe);
assert_sequence(sequence);
}, "pagehide should be called before visibilitychange, and visibilityState should be set to hidden at the right time");
</script>
</body>
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