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<!DOCTYPE HTML>
<title>Test VisibleStateEntry</title>
<link rel="author" title="Noam Rosenthal" href="mailto:nrosenthal@chromium.org">
<link rel="help" href="https://html.spec.whatwg.org/multipage/interaction.html#page-visibility">
<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="resources/window_state_context.js"></script>
<script>
setup(() => {
assert_implements(window.VisibilityStateEntry, 'VisibilityStateEntry is not supported.');
});
promise_test(async t => {
const {minimizeAndWait, restoreAndWait} = window_state_context(t);
const all = performance.getEntries();
let entries = performance.getEntriesByType("visibility-state");
assert_equals(entries.length, 1);
assert_equals(entries[0].name, "visible");
assert_equals(entries[0].startTime, 0);
assert_equals(entries[0].duration, 0);
await minimizeAndWait();
entries = performance.getEntriesByType("visibility-state");
assert_equals(entries.length, 2);
assert_equals(entries[1].name, "hidden");
assert_equals(entries[1].duration, 0);
await restoreAndWait();
entries = performance.getEntriesByType("visibility-state");
assert_equals(entries.length, 3);
assert_equals(entries[2].name, "visible");
assert_equals(entries[2].duration, 0);
}, "Hiding/showing the page should create visibility-state entries");
promise_test(async t => {
const {minimizeAndWait} = window_state_context(t);
await minimizeAndWait();
const iframe = document.createElement("iframe");
iframe.src = "resources/blank_page_green.html";
const loaded = new Promise(resolve => iframe.addEventListener("load", resolve));
t.add_cleanup(() => iframe.remove());
document.body.appendChild(iframe);
await loaded;
const entries = iframe.contentWindow.performance.getEntriesByType("visibility-state");
assert_equals(entries[0].name, "hidden");
assert_equals(entries[0].startTime, 0);
}, "If a page starts as hidden, the first visibility-state entry should be hidden");
promise_test(async t => {
const {minimize, restore} = window_state_context(t);
const observed = new Promise(resolve => new PerformanceObserver(list => {
if (list.getEntries()[0].name === "visible")
resolve();
}).observe({entryTypes: ['visibility-state']}));
await minimize();
await restore();
await observed;
}, "Visibility state entries should be queued to performance observers");
promise_test(async t => {
const entry = await new Promise(resolve => new PerformanceObserver(
(list, observer) => {
observer.disconnect();
resolve(list.getEntries()[0]);
}).observe({type: "visibility-state", buffered: true}));
assert_equals(entry.name, "visible");
}, "Visibility state observers should respect the buffered flag");
</script>
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