diff --git a/experiments/WebScene.NativeEngine.Probe/native/webscene_indexeddb_compatibility.h b/experiments/WebScene.NativeEngine.Probe/native/webscene_indexeddb_compatibility.h
index e7d0ec344..51b55eaf3 100644
--- a/experiments/WebScene.NativeEngine.Probe/native/webscene_indexeddb_compatibility.h
+++ b/experiments/WebScene.NativeEngine.Probe/native/webscene_indexeddb_compatibility.h
@@ -216,7 +216,8 @@ inline constexpr std::string_view indexeddb_compatibility_source = R"JS(
     deleteIndex() { throw failure('Indexes are not implemented', 'NotSupportedError'); }
   }
 
-  class IDBTransaction extends EventTarget {
+)JS"
+R"JS(  class IDBTransaction extends EventTarget {
     constructor(database, storeNames, mode, state, revision, versionchange = false) {
       super();
       this.db = database;
diff --git a/scripts/tests/test_v8_bootstrap_literals.py b/scripts/tests/test_v8_bootstrap_literals.py
index f18c382d5..6815e49e2 100644
--- a/scripts/tests/test_v8_bootstrap_literals.py
+++ b/scripts/tests/test_v8_bootstrap_literals.py
@@ -3,6 +3,7 @@
 
 from __future__ import annotations
 
+import hashlib
 import importlib.util
 import pathlib
 import re
@@ -21,6 +22,13 @@
 SERVICE_WORKER_PATH = RUNTIME_PATH.with_name(
     "webscene_v8_runtime_service_workers.inc"
 )
+INDEXEDDB_PATH = (
+    ROOT
+    / "experiments"
+    / "WebScene.NativeEngine.Probe"
+    / "native"
+    / "webscene_indexeddb_compatibility.h"
+)
 
 SPEC = importlib.util.spec_from_file_location("extract_bootstraps", EXTRACTOR_PATH)
 assert SPEC is not None and SPEC.loader is not None
@@ -57,6 +65,25 @@ def test_service_worker_bootstrap_literals_are_portable(self) -> None:
             )
         )
 
+    def test_indexeddb_bootstrap_is_portable_and_byte_exact(self) -> None:
+        source = INDEXEDDB_PATH.read_text(encoding="utf-8")
+        parts = EXTRACTOR.extract_parts(
+            source, "indexeddb_compatibility_source"
+        )
+        joined = "".join(parts)
+
+        self.assertGreater(len(parts), 1)
+        self.assertTrue(
+            all(
+                len(part.encode("utf-8")) <= EXTRACTOR.MAX_RAW_LITERAL_BYTES
+                for part in parts
+            )
+        )
+        self.assertEqual(
+            hashlib.sha256(joined.encode("utf-8")).hexdigest(),
+            "a3c907644e9b6c9d63eddfbd6a591802e99bbd3249a3b1437788ce4eb1c73b64",
+        )
+
 
 if __name__ == "__main__":
     unittest.main()