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+# Built-In Mocks
+
+`@nuxt/test-utils` provides built-in mocks for browser APIs in the DOM test environment.
+
+## `intersectionObserver`
+
+- **Default:** `true`
+- Creates a dummy class without any functionality for the IntersectionObserver API.
+
+## `indexedDB`
+
+- **Default:** `false`
+- Uses [`fake-indexeddb`](https://github.com/dumbmatter/fakeIndexedDB) to create a functional mock of the IndexedDB API.
+
+## Configuration
+
+```ts
+// vitest.config.ts
+import { defineVitestConfig } from '@nuxt/test-utils/config'
+
+export default defineVitestConfig({
+  test: {
+    environmentOptions: {
+      nuxt: {
+        mock: {
+          intersectionObserver: true,
+          indexedDb: true,
+        },
+      },
+    },
+  },
+})
+```