diff --git a/IndexedDB/key-serialization-transaction-state.any.js b/IndexedDB/key-serialization-transaction-state.any.js
new file mode 100644
index 00000000000000..5f9dfe0467b28b
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+++ b/IndexedDB/key-serialization-transaction-state.any.js
@@ -0,0 +1,100 @@
+// META: script=resources/support-promises.js
+// META: title=Indexed DB transaction state during Structured Serializing
+// META: timeout=long
+'use strict';
+
+const setupKetSerializationTest = async (testCase) => {
+  const db = await createDatabase(testCase, database => {
+    const objectStore = database.createObjectStore('store');
+    objectStore.createIndex('idx', 'name');
+    objectStore.put({ name: 'a' }, 0);
+  });
+
+  const transaction = db.transaction(['store'], 'readwrite');
+  const objectStore = transaction.objectStore('store');
+  const index = objectStore.index('idx');
+
+  return { db, transaction, objectStore, index };
+};
+
+const testKeySerialization = async (db, testCase, transaction, objectStore, callback) => {
+  let getterCalled = false;
+
+  const activeKey = ['value that should not be used'];
+  Object.defineProperty(activeKey, '0', {
+    enumerable: true,
+    get: testCase.step_func(() => {
+      getterCalled = true;
+      assert_throws_dom('TransactionInactiveError', () => {
+        objectStore.get('key');
+      }, 'transaction should not be active during key serialization');
+      return 'value that should not be used';
+    }),
+  });
+
+  callback(activeKey)
+
+  await promiseForTransaction(testCase, transaction);
+  db.close();
+
+  assert_true(getterCalled,
+    "activeKey's getter should be called during test");
+};
+
+promise_test(async testCase => {
+  const { db, transaction, objectStore } = await setupKetSerializationTest(testCase);
+
+  await testKeySerialization(db, testCase, transaction, objectStore, activeKey => {
+    objectStore.add({}, activeKey);
+  });
+}, 'Transaction inactive during key serialization in IDBObjectStore.add()');
+
+promise_test(async testCase => {
+  const { db, transaction, objectStore } = await setupKetSerializationTest(testCase);
+
+  await testKeySerialization(db, testCase, transaction, objectStore, activeKey => {
+    objectStore.put({}, activeKey);
+  });
+}, 'Transaction inactive during key serialization in IDBObjectStore.put()');
+
+promise_test(async testCase => {
+  const { db, transaction, objectStore } = await setupKetSerializationTest(testCase);
+
+  const cursor = await new Promise((resolve, reject) => {
+    const cursorReq = objectStore.openCursor();
+    cursorReq.onerror = reject;
+    cursorReq.onsuccess = e => resolve(e.target.result);
+  });
+
+  await testKeySerialization(db, testCase, transaction, objectStore, activeKey => {
+    cursor.continue(activeKey);
+  });
+}, 'Transaction inactive during key serialization in IDBCursor.continue()');
+
+promise_test(async testCase => {
+  const { db, transaction, objectStore, index } = await setupKetSerializationTest(testCase);
+
+  const cursor = await new Promise((resolve, reject) => {
+    const cursorReq = index.openCursor();
+    cursorReq.onerror = reject;
+    cursorReq.onsuccess = e => resolve(e.target.result);
+  });
+
+  await testKeySerialization(db, testCase, transaction, objectStore, activeKey => {
+    cursor.continuePrimaryKey(activeKey, 0);
+  });
+}, 'Transaction inactive during key serialization in IDBCursor.continuePrimaryKey()');
+
+promise_test(async testCase => {
+  const { db, transaction, objectStore, index } = await setupKetSerializationTest(testCase);
+
+  const cursor = await new Promise((resolve, reject) => {
+    const cursorReq = index.openCursor();
+    cursorReq.onerror = reject;
+    cursorReq.onsuccess = e => resolve(e.target.result);
+  });
+
+  await testKeySerialization(db, testCase, transaction, objectStore, activeKey => {
+    cursor.continuePrimaryKey(0, activeKey);
+  });
+}, 'Transaction inactive during primary key serialization in IDBCursor.continuePrimaryKey()');
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