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<!DOCTYPE html>
<title>Handling of exceptions in custom element constructors</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
setup({allow_uncaught_exception: true});
window.log = [];
window.addEventListener("error", ev => log.push(ev.error));
const test_load = async_test(
"Test that exceptions from the constructor of a custom element " +
"inside a module are propagated as expected.\n");
window.addEventListener("load", test_load.step_func_done(ev => {
assert_equals(1, log.length);
const exception = log[0];
assert_true(exception instanceof Error);
assert_equals(exception.message, "custom element error");
}));
</script>
<script type="module">
class XThrower extends HTMLElement {
constructor() {
super();
throw new Error("custom element error");
}
}
customElements.define("x-thrower", XThrower);
document.createElement("x-thrower");
</script>
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