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chromium/third_party/blink/web_tests/external/wpt/IndexedDB/idbtransaction-db-SameObject.html 

<!doctype html>
<meta charset=utf-8>
<title>IndexedDB: Verify [SameObject] behavior of IDBTransaction's db attribute</title>
<meta name="help" href="https://w3c.github.io/IndexedDB/#dom-idbtransaction-db">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/support.js"></script>
<script>

indexeddb_test(
  (t, db, tx) => {
    const store = db.createObjectStore('store');
    assert_equals(tx.db, tx.db,
                  'Attribute should yield the same object each time');
  },
  (t, db) => {
    const tx = db.transaction('store', 'readonly', {durability: 'relaxed'});
    assert_equals(tx.db, tx.db,
                  'Attribute should yield the same object each time');
    t.done();
  },
  'IDBTransaction.db [SameObject]'
);
</script>