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diff --git a/testing/web-platform/tests/IndexedDB/idbdatabase-transaction-exception-order.html b/testing/web-platform/tests/IndexedDB/idbdatabase-transaction-exception-order.html
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+<!doctype html>
+<meta charset=utf-8>
+<title>IndexedDB: IDBDatabase transaction() Exception Ordering</title>
+<link rel="help" href="https://w3c.github.io/IndexedDB/#dom-idbdatabase-transaction">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/support.js"></script>
+<script>
+
+indexeddb_test(
+  (t, db) => {
+    db.createObjectStore('s');
+  },
+  (t, db) => {
+    db.close();
+    assert_throws_dom('InvalidStateError', () => {
+      db.transaction('no-such-store');
+    }, '"Connection is closed" check (InvalidStateError) should precede ' +
+       '"store names" check (NotFoundError)');
+    t.done();
+  },
+  'IDBDatabase.transaction exception order: InvalidStateError vs. NotFoundError'
+);
+
+indexeddb_test(
+  (t, db) => {
+    db.createObjectStore('s');
+  },
+  (t, db) => {
+    db.close();
+    assert_throws_dom('InvalidStateError', () => {
+      db.transaction([]);
+    }, '"Connection is closed" check (InvalidStateError) should precede ' +
+       '"stores is empty" check (InvalidAccessError)');
+    t.done();
+  },
+  'IDBDatabase.transaction exception order: InvalidStateError vs. InvalidAccessError'
+);
+
+// Verify that the invalid mode check actually throws an exception
+indexeddb_test(
+  (t, db) => {
+    db.createObjectStore('s');
+  },
+  (t, db) => {
+    assert_throws_js(TypeError, () => {
+      db.transaction('s', 'versionchange');
+    }, '"invalid mode" check should throw TypeError');
+    t.done();
+  },
+  'IDBDatabase.transaction throws exception on invalid mode'
+);
+
+indexeddb_test(
+  (t, db) => {
+    db.createObjectStore('s');
+  },
+  (t, db) => {
+    assert_throws_dom('NotFoundError', () => {
+      db.transaction('no-such-store', 'versionchange');
+    }, '"No such store" check (NotFoundError) should precede ' +
+       '"invalid mode" check (TypeError)');
+    t.done();
+  },
+  'IDBDatabase.transaction exception order: NotFoundError vs. TypeError'
+);
+
+</script>