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Test Info:

test(() => {
if (typeof PerformanceObserver.supportedEntryTypes === "undefined")
assert_unreached("supportedEntryTypes is not supported.");
assert_true(PerformanceObserver.supportedEntryTypes.includes("navigation"),
"There should be an entry 'navigation' in PerformanceObserver.supportedEntryTypes");
}, "supportedEntryTypes contains 'navigation'.");
if (typeof PerformanceObserver.supportedEntryTypes !== "undefined") {
const entryType = "navigation";
if (PerformanceObserver.supportedEntryTypes.includes(entryType)) {
promise_test(async() => {
await new Promise((resolve) => {
new PerformanceObserver(function (list, observer) {
observer.disconnect();
resolve();
}).observe({entryTypes: [entryType]});
})
}, `'${entryType}' entries should be observable.`)
}
}