<!doctype html> <meta charset=utf-8> <title>IndexedDB: ES bindings - Inject a key into a value - Values bypass chain</title> <meta name="help" href="https://w3c.github.io/IndexedDB/#inject-key-into-value-values-bypass-chain"> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <script src="resources/support-promises.js"></script> <script> promise_test(async t => { const db = await createDatabase(t, db => { db.createObjectStore('store', {autoIncrement: true, keyPath: 'a.b.c'}); }); Object.prototype.a = {b: {c: 'on proto'}}; t.add_cleanup(() => { delete Object.prototype.a; }); const tx = db.transaction('store', 'readwrite', {durability: "relaxed"}); tx.objectStore('store').put({}); const result = await promiseForRequest(t, tx.objectStore('store').get(1)); assert_true(result.hasOwnProperty('a'), 'Result should have own-properties overriding prototype.'); assert_true(result.a.hasOwnProperty('b'), 'Result should have own-properties overriding prototype.'); assert_true(result.a.b.hasOwnProperty('c'), 'Result should have own-properties overriding prototype.'); assert_equals(result.a.b.c, 1, 'Own property should match primary key generator value'); assert_equals(Object.prototype.a.b.c, 'on proto', 'Prototype should not be modified'); }, 'Returning values to script should bypass prototype chain'); </script>