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<!doctype html>
<html>
<head>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/utils.js"></script>
<script src="/common/dispatcher/dispatcher.js"></script>
<script src="/html/browsers/browsing-the-web/back-forward-cache/resources/helper.sub.js"></script>
</head>
<body>
<script>
const BackForwardCacheRestorationName = '';
const BackForwardCacheRestorationType = 'back-forward-cache-restoration';
let getNumberofBackForwardCacheRestorationEntries = (BackForwardCacheRestorationType) => {
return window.performance.getEntriesByType(BackForwardCacheRestorationType).length;
}
let getBackForwardCacheRestorationByType = (BackForwardCacheRestorationType) => {
let entries = window.performance.getEntriesByType(BackForwardCacheRestorationType);
return entries[entries.length - 1];
}
let getBackForwardCacheRestorationByGetAllAndFilter = (BackForwardCacheRestorationType) => {
let entries = window.performance.getEntries().filter(e => e.entryType == BackForwardCacheRestorationType);
return entries[entries.length - 1];
}
let getBackForwardCacheRestorationByPerformanceObserverBuffered = async (BackForwardCacheRestorationType) => {
let p = new Promise(resolve => {
new PerformanceObserver((list) => {
const entries = list.getEntries().filter(e => e.entryType == BackForwardCacheRestorationType);
if (entries.length > 0) {
resolve(entries[entries.length - 1]);
}
}).observe({ type: BackForwardCacheRestorationType, buffered: true });
});
return await p;
}
let checkEntry = (entry, expectedNavigationId) => {
assert_equals(entry.name, BackForwardCacheRestorationName);
assert_equals(entry.entryType, BackForwardCacheRestorationType);
assert_equals(entry.navigationId, expectedNavigationId);
assert_true(entry.pageshowEventStart > entry.startTime);
assert_true(entry.pageshowEventEnd >= entry.pageshowEventStart);
}
promise_test(async t => {
const pageA = new RemoteContext(token());
const pageB = new RemoteContext(token());
const urlA = executorPath + pageA.context_id;
const urlB = originCrossSite + executorPath + pageB.context_id;
// Open url A.
window.open(urlA, '_blank', 'noopener');
await pageA.execute_script(waitForPageShow);
// Assert no instance of BackForwardCacheRestoration exists without back forward cache navigatoin.
let size = await pageA.execute_script(getNumberofBackForwardCacheRestorationEntries);
assert_equals(0, size);
let entry;
for (i = 0; i < 2; i++) {
// Navigate away to url B and back.
await navigateAndThenBack(pageA, pageB, urlB);
// Assert Performance Observer API supports BackForwardCacheRestoration.
entry = await pageA.execute_script(getBackForwardCacheRestorationByPerformanceObserverBuffered, [BackForwardCacheRestorationType]);
checkEntry(entry, i + 2); // The expected navigation id of the entry created at i-th navigating away and back is i+2 because navigation id starts from 1 and increments before an instance of BackForwardRestoration is created.
// Assert Performance Timeline API supports BackForwardCacheRestoration.
entry = await pageA.execute_script(getBackForwardCacheRestorationByType, [BackForwardCacheRestorationType]);
checkEntry(entry, i + 2);
entry = await pageA.execute_script(getBackForwardCacheRestorationByGetAllAndFilter, [BackForwardCacheRestorationType]);
checkEntry(entry, i + 2);
}
}, 'Performance API for the back forward cache restoration entry.');
</script>
</body>
</html>
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