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diff --git a/testing/web-platform/tests/IndexedDB/fire-success-event-exception.html b/testing/web-platform/tests/IndexedDB/fire-success-event-exception.html
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+++ b/testing/web-platform/tests/IndexedDB/fire-success-event-exception.html
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+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Fire success event - Exception thrown</title>
+<link rel="help" href="https://w3c.github.io/IndexedDB/#fire-success-event">
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=resources/support.js></script>
+<script>
+setup({allow_uncaught_exception:true});
+
+function fire_success_event_test(func, description) {
+ indexeddb_test(
+ (t, db) => {
+ db.createObjectStore('s');
+ },
+ (t, db) => {
+ const tx = db.transaction('s', 'readonly', {durability: 'relaxed'});
+ tx.oncomplete = t.unreached_func('transaction should abort');
+ const store = tx.objectStore('s');
+ const request = store.get(0);
+ func(t, db, tx, request);
+ tx.addEventListener('abort', t.step_func_done(() => {
+ assert_equals(tx.error.name, 'AbortError');
+ }));
+ },
+ description);
+}
+
+fire_success_event_test((t, db, tx, request) => {
+ request.onsuccess = () => {
+ throw Error();
+ };
+}, 'Exception in success event handler on request');
+
+fire_success_event_test((t, db, tx, request) => {
+ request.addEventListener('success', () => {
+ throw Error();
+ });
+}, 'Exception in success event listener on request');
+
+fire_success_event_test((t, db, tx, request) => {
+ request.addEventListener('success', {
+ get handleEvent() {
+ throw new Error();
+ },
+ });
+}, 'Exception in success event listener ("handleEvent" lookup) on request');
+
+fire_success_event_test((t, db, tx, request) => {
+ request.addEventListener('success', {
+ handleEvent: null,
+ });
+}, 'Exception in success event listener (non-callable "handleEvent") on request');
+
+fire_success_event_test((t, db, tx, request) => {
+ request.addEventListener('success', () => {
+ // no-op
+ });
+ request.addEventListener('success', () => {
+ throw Error();
+ });
+}, 'Exception in second success event listener on request');
+
+fire_success_event_test((t, db, tx, request) => {
+ let second_listener_called = false;
+ request.addEventListener('success', () => {
+ throw Error();
+ });
+ request.addEventListener('success', t.step_func(() => {
+ second_listener_called = true;
+ assert_true(is_transaction_active(tx, 's'),
+ 'Transaction should be active until dispatch completes');
+ }));
+ tx.addEventListener('abort', t.step_func(() => {
+ assert_true(second_listener_called);
+ }));
+}, 'Exception in first success event listener, tx active in second');
+
+</script>