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+<!DOCTYPE html>
+<title>IndexedDB: IDBCursor update() Exception Ordering</title>
+<meta charset=utf-8>
+<link rel="help" href="https://w3c.github.io/IndexedDB/#dom-idbcursor-update">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/support.js"></script>
+<script>
+
+indexeddb_test(
+  (t, db) => {
+    const s = db.createObjectStore('s');
+    s.put('value', 'key');
+  },
+  (t, db) => {
+    const s = db.transaction('s', 'readonly', {durability: 'relaxed'}).objectStore('s');
+    const r = s.openCursor();
+    r.onsuccess = t.step_func(() => {
+      r.onsuccess = null;
+      const cursor = r.result;
+      setTimeout(t.step_func(() => {
+        assert_throws_dom('TransactionInactiveError', () => {
+          cursor.update('value2');
+        }, '"Transaction inactive" check (TransactionInactiveError) ' +
+           'should precede "read only" check (ReadOnlyError)');
+        t.done();
+      }), 0);
+    });
+  },
+  'IDBCursor.update exception order: TransactionInactiveError vs. ReadOnlyError'
+);
+
+indexeddb_test(
+  (t, db) => {
+    const s = db.createObjectStore('s');
+    s.put('value', 'key');
+  },
+  (t, db) => {
+    const s = db.transaction('s', 'readonly', {durability: 'relaxed'}).objectStore('s');
+    const r = s.openCursor();
+    r.onsuccess = t.step_func(() => {
+      r.onsuccess = null;
+      const cursor = r.result;
+      cursor.continue();
+      assert_throws_dom('ReadOnlyError', () => {
+        cursor.update('value2');
+      }, '"Read only" check (ReadOnlyError) should precede '+
+         '"got value flag" check (InvalidStateError)');
+      t.done();
+    });
+  },
+  'IDBCursor.update exception order: ReadOnlyError vs. InvalidStateError #1'
+);
+
+indexeddb_test(
+  (t, db) => {
+    const s = db.createObjectStore('s');
+    s.put('value', 'key');
+  },
+  (t, db) => {
+    const s = db.transaction('s', 'readonly', {durability: 'relaxed'}).objectStore('s');
+    const r = s.openKeyCursor();
+    r.onsuccess = t.step_func(() => {
+      r.onsuccess = null;
+      const cursor = r.result;
+      assert_throws_dom('ReadOnlyError', () => {
+        cursor.update('value2');
+      }, '"Read only" check (ReadOnlyError) should precede '+
+         '"key only flag" check (InvalidStateError)');
+      t.done();
+    });
+  },
+  'IDBCursor.update exception order: ReadOnlyError vs. InvalidStateError #2'
+);
+
+indexeddb_test(
+  (t, db) => {
+    const s = db.createObjectStore('s', {keyPath: 'id'});
+    s.put({id: 123, data: 'value'});
+  },
+  (t, db) => {
+    const s = db.transaction('s', 'readwrite', {durability: 'relaxed'}).objectStore('s');
+    const r = s.openCursor();
+    r.onsuccess = t.step_func(() => {
+      r.onsuccess = null;
+      const cursor = r.result;
+      cursor.continue();
+      assert_throws_dom('InvalidStateError', () => {
+        cursor.update({id: 123, data: 'value2'});
+      }, '"Got value flag" check (InvalidStateError) should precede ' +
+         '"modified key" check (DataError)');
+      t.done();
+    });
+  },
+  'IDBCursor.update exception order: InvalidStateError vs. DataError'
+);
+
+</script>