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Test Info:

<!doctype html>
<meta charset=utf-8>
<title>MutationObserver reports the exception from its callback in the callback's global object</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<iframe></iframe>
<iframe></iframe>
<iframe></iframe>
<script>
setup({ allow_uncaught_exception: true });
const onerrorCalls = [];
window.onerror = () => { onerrorCalls.push("top"); };
frames[0].onerror = () => { onerrorCalls.push("frame0"); };
frames[1].onerror = () => { onerrorCalls.push("frame1"); };
frames[2].onerror = () => { onerrorCalls.push("frame2"); };
async_test(t => {
window.onload = t.step_func(() => {
const target = frames[0].document.body;
const mo = new frames[0].MutationObserver(new frames[1].Function(`throw new parent.frames[2].Error("PASS");`));
mo.observe(target, { childList: true, subtree: true });
target.append("foo");
t.step_timeout(() => {
assert_array_equals(onerrorCalls, ["frame1"]);
t.done();
}, 4);
});
});
</script>