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diff --git a/testing/web-platform/tests/IndexedDB/idbcursor-iterating-update.htm b/testing/web-platform/tests/IndexedDB/idbcursor-iterating-update.htm
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+++ b/testing/web-platform/tests/IndexedDB/idbcursor-iterating-update.htm
@@ -0,0 +1,58 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>IndexedDB: Index iteration with cursor updates/deletes</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/support.js"></script>
+<script>
+const objStoreValues = [
+  {name: 'foo', id: 1},
+  {name: 'bar', id: 2},
+  {name: 'foo', id: 3},
+  {name: 'bar', id: 4},
+];
+
+const objStoreValuesByIndex = [
+  objStoreValues[1],
+  objStoreValues[3],
+  objStoreValues[0],
+  objStoreValues[2],
+];
+
+const functionsThatShouldNotAffectIteration = [
+  cursor => cursor.update({}),
+  cursor => cursor.delete(),
+];
+
+functionsThatShouldNotAffectIteration.forEach((func) => indexeddb_test(
+  (t, db) => {
+    const objStore = db.createObjectStore('items', {autoIncrement: true});
+    objStore.createIndex('name', 'name', {unique: false});
+    objStoreValues.forEach((value) => objStore.add(value));
+  },
+  (t, db) => {
+    const txn = db.transaction('items', 'readwrite', {durability: 'relaxed'});
+    const objStore = txn.objectStore('items');
+    const nameIndex = objStore.index('name');
+
+    const cursorValues = [];
+    nameIndex.openCursor().onsuccess = (evt) => {
+      const cursor = evt.target.result;
+      if (cursor) {
+        func(cursor);
+        cursorValues.push(cursor.value);
+        cursor.continue();
+      } else {
+        assert_equals(cursorValues.length, 4,
+            `Cursor should iterate over 4 records`);
+
+        cursorValues.forEach((value, i) => {
+          assert_object_equals(value, objStoreValuesByIndex[i]);
+        });
+        t.done();
+      }
+    }
+  },
+  `Calling ${func} doesn't affect index iteration`
+));
+</script>