<!DOCTYPE html>
<html>
<head>
    <script src="../../resources/testharness.js"></script>
    <script src="../../resources/testharnessreport.js"></script>
</head>
<body>
<script>
test(() => {
    assert_throws("DATA_CLONE_ERR", () => {
        window.postMessage(Symbol("Cocoa"), "*");
    });
    assert_throws("DATA_CLONE_ERR", () => {
        window.postMessage({0: Symbol("Cocoa")}, "*");
    });
    assert_throws("DATA_CLONE_ERR", () => {
        window.postMessage({hello: Symbol("Cocoa")}, "*");
    });
    assert_throws("DATA_CLONE_ERR", () => {
        window.postMessage([Symbol("Cocoa")], "*");
    });
}, "Tests that posting a message that contains Symbols fails.");
</script>
</body>
</html>