diff --git a/demo/test.html b/demo/test.html
new file mode 100644
index 0000000..31bf091
--- /dev/null
+++ b/demo/test.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>OPFS Tools</title>
+  <style>
+    .tip {
+      font-style: italic;
+    }
+
+    #status {
+      color: red;
+    }
+  </style>
+</head>
+
+<body>
+  <script src="https://cdn.jsdelivr.net/npm/opfs-tools-explorer"></script>
+  <script>
+    OTExplorer.init();
+  </script>
+  <script src="./test.ts" type="module"></script>
+</body>
+
+</html>
\ No newline at end of file
diff --git a/demo/test.ts b/demo/test.ts
new file mode 100644
index 0000000..7d5991e
--- /dev/null
+++ b/demo/test.ts
@@ -0,0 +1,10 @@
+import { tmpfile, write } from '../src';
+
+console.log(111, localStorage.getItem('OPFS_TOOLS_EXPIRES_TMP_FILES'));
+const f = tmpfile();
+console.log(222, f.path);
+await write(f, '111111111');
+
+await write('/.opfs-tools-temp-dir/xxx', '2222');
+
+export {};
