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+<!DOCTYPE html>
+<title>pagereveal event fires and in correct order on restoration from BFCache</title>
+<link rel="help" href="https://html.spec.whatwg.org/multipage/browsing-the-web.html#updating-the-document">
+<link rel="author" href="mailto:bokan@chromium.org">
+<meta name="timeout" content="long">
+<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>
+<script>
+// runBfcacheTest opens a popup to pageA which navigates to pageB and then
+// back, ensuring pageA is stored in the BFCache.
+runBfcacheTest({
+ funcBeforeNavigation: async () => {
+ // This function executes in pageA
+
+ // Wait for an animation frame to ensure the the initial-load
+ // `pagereveal` has already been fired so it doesn't get recorded
+ // below.
+ const raf = new Promise(resolve => requestAnimationFrame(resolve));
+ await raf;
+
+ window.event_log = [];
+ let restored = false;
+
+ function recordRafs() {
+ requestAnimationFrame( () => {
+ // Avoid recording animation frames until the page is restored from
+ // BFCache since it's currently uncached. This test is interested only
+ // in the behavior during restoration.
+ if (restored)
+ window.event_log.push('rAF');
+
+ recordRafs();
+ });
+ }
+
+ recordRafs();
+
+ addEventListener('pageshow', (e) => {
+ window.event_log.push('pageshow' + (e.persisted ? '.persisted' : ''));
+ if (e.persisted)
+ restored = true;
+ });
+
+ addEventListener('pagereveal', () => {
+ window.event_log.push('pagereveal');
+ });
+ },
+ funcAfterAssertion: async (pageA, pageB, t) => {
+ let event_log = await pageA.execute_script(async () => {
+ // Ensure at least one animation frame is produced to ensure
+ // pagereveal must have fired.
+ await new Promise(requestAnimationFrame);
+ return window.event_log;
+ });
+
+ // Expect that the events seen are:
+ // pageshow.persisted, pagereveal, rAF, rAF, rAF, ...
+ assert_equals(event_log.slice(0, 3).toString(),
+ 'pageshow.persisted,pagereveal,rAF');
+ for (let i = 3; i < event_log.length; ++i) {
+ assert_equals(event_log[i], 'rAF',
+ 'All events following pagereveal should be animation frames');
+ }
+ },
+ targetOrigin: originSameOrigin,
+});
+</script>