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+++ b/testing/web-platform/tests/IndexedDB/idbobjectstore-add-put-exception-order.html
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+<!doctype html>
+<meta charset=utf-8>
+<title>IndexedDB: IDBObjectStore add()/put() Exception Ordering</title>
+<link rel="help" href="https://w3c.github.io/IndexedDB/#dom-idbobjectstore-put">
+<link rel="help" href="https://w3c.github.io/IndexedDB/#dom-idbobjectstore-add">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/support.js"></script>
+<script>
+
+['put', 'add'].forEach(method => {
+  indexeddb_test(
+    (t, db) => {
+      const store = db.createObjectStore('s');
+      const store2 = db.createObjectStore('s2');
+
+      db.deleteObjectStore('s2');
+
+      setTimeout(t.step_func(() => {
+        assert_throws_dom(
+          'InvalidStateError', () => { store2[method]('key', 'value'); },
+          '"has been deleted" check (InvalidStateError) should precede ' +
+          '"not active" check (TransactionInactiveError)');
+        t.done();
+      }), 0);
+    },
+    (t, db) => {},
+    `IDBObjectStore.${method} exception order: ` +
+    'InvalidStateError vs. TransactionInactiveError'
+  );
+
+  indexeddb_test(
+    (t, db) => {
+      const store = db.createObjectStore('s');
+    },
+    (t, db) => {
+      const tx = db.transaction('s', 'readonly', {durability: 'relaxed'});
+      const store = tx.objectStore('s');
+
+      setTimeout(t.step_func(() => {
+        assert_throws_dom(
+          'TransactionInactiveError', () => { store[method]('key', 'value'); },
+          '"not active" check (TransactionInactiveError) should precede ' +
+          '"read only" check (ReadOnlyError)');
+        t.done();
+      }), 0);
+    },
+
+    `IDBObjectStore.${method} exception order: ` +
+    'TransactionInactiveError vs. ReadOnlyError'
+  );
+
+  indexeddb_test(
+    (t, db) => {
+      const store = db.createObjectStore('s');
+    },
+    (t, db) => {
+      const tx = db.transaction('s', 'readonly', {durability: 'relaxed'});
+      const store = tx.objectStore('s');
+
+      assert_throws_dom(
+        'ReadOnlyError', () => { store[method]({}, 'value'); },
+        '"read only" check (ReadOnlyError) should precede ' +
+        'key/data check (DataError)');
+
+      t.done();
+    },
+
+    `IDBObjectStore.${method} exception order: ` +
+    'ReadOnlyError vs. DataError'
+  );
+});
+
+</script>