LayoutTests/performance-api/performance-observer-callback-after-gc.html

<!DOCTYPE HTML>
<html>
<head>
<script src="../resources/js-test-pre.js"></script>
</head>
<body>
<script>
description("Ensure PerformanceObserver callback fires even if the JS does not keep the PerformanceObserver object alive.");
window.jsTestIsAsync = true;

let receivedEntries = [];

let observer = new PerformanceObserver((list) => {
    for (let mark of list.getEntries())
        receivedEntries.push(mark.name);

    if (receivedEntries.length == 3) {
        for (let name of receivedEntries)
            testPassed(name);
       finishJSTest();
    }
});
observer.observe({entryTypes: ["mark"]});
observer = null;
gc();

// ---

performance.mark("mark1");

setTimeout(() => {
    gc();
    performance.mark("mark2");
    performance.mark("mark3");
}, 50);
</script>
<script src="../resources/js-test-post.js"></script>
</body>
</html>