LayoutTests/performance-api/performance-observer-exception.html

<!DOCTYPE HTML>
<html>
<head>
<script src="../resources/js-test-pre.js"></script>
</head>
<body>
<script>
description("Ensure PerformanceObserver Exceptions are propogated.");
window.jsTestIsAsync = true;

let seenExceptions = 0;

window.onerror = function(message) {
    testPassed("onerror: " + message);

    seenExceptions++;
    if (seenExceptions === 2)
        finishJSTest();
}

let observer1 = new PerformanceObserver((list) => {
    debug("PerformanceObserver callback fired");
    throw "EXCEPTION MESSAGE IN CALLBACK";
});

class MyObserver {};
let observer2 = new PerformanceObserver(MyObserver);

observer1.observe({entryTypes: ["mark"]});
observer2.observe({entryTypes: ["mark"]});
performance.mark("mark1");
</script>
<script src="../resources/js-test-post.js"></script>
</body>
</html>