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chromium/third_party/blink/web_tests/external/wpt/workers/SharedWorker-script-error.html 

<!DOCTYPE html>
<title>Test SharedWorker script error handling functionality.</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
promise_test(t => {
    let worker;

    return new Promise((resolve) => {
        worker = new SharedWorker("support/SharedWorker-script-error.js");
        // Shared workers should only invoke onerror for loading errors.
        worker.onerror = function(evt) {
            assert_unreached("FAIL: onerror invoked for a script error.");
        };
        worker.port.postMessage("unhandledError");
        worker.port.onmessage = resolve;
    }).then(e => {
        assert_equals(e.data, "SUCCESS: unhandled error generated");
    });
}, 'Test script error unhandled.')

promise_test(t => {
    let worker;

    return new Promise((resolve) => {
        worker = new SharedWorker("support/SharedWorker-script-error.js");
        // Shared workers should only invoke onerror for loading errors.
        worker.onerror = function(evt) {
            assert_unreached("FAIL: onerror invoked for a script error.");
        };
        worker.port.postMessage("handledError");
        worker.port.onmessage = resolve;
    }).then(e => {
        assert_equals(e.data, "SUCCESS: error handled via onerror");
    });
}, 'Test script error handled.')
</script>